Geology 17 (Landslides and Mass Wasting)

Glad to have you studying with me! I have more content in the works and I hope you'll enjoy it. For those that are interested, the best textbook out there is this one: amzn.to/47VNed8. However, it's a little old now (two of the authors have passed away) and if you prefer a newer textbook, I would recommend this one: amzn.to/45UFDcR
For other physical geology lectures: kzbin.info/aero/PLcI_lGDDt5A65hZDfQVPMEUzDRYYXWHoy
This lecture video is on the physical manner in which landslides and mass wasting work to counteract the rapid growth of young mountains, carve out beautiful valley and landscapes, and help to return uplifted continental rock and minerals back to the sea. I hope you enjoy it!

[@mikev2072]

This guys ballin' hard yo. I just took earth hazards and I wish my lectures were this interesting.

[@lonnarheaj]

I am a card carrying Dirt Nerd with a background in Soil Science, and I am loving all of this lecture. Thank You!!! Most people do not realize that the surface of the earth really wants to be flat. The earth is just a slow mover in smoothing things out, until it isn't.

[@reidbarclay4925]

Check out the Turtle Mountain Slide in the Crowsnest Pass of southern Alberta, Canada for a great example of mass wasting of a whole mountain face! You can drive on the highway they put through it and drive past boulders that are bigger then most houses! Only happened about 100 years ago now!

[@clayz1]

Is that the one where a slide slid off of one side of a valley and half way up the other side of the valley, taking out the main highway there (trans Canada I think. East west. Below Banff on the map. We used to drive up to Edmonton on family vacations (from Seattle) back in the 1960s, I remember seeing the result of that slide and being awed.

[@Namuchat]

You are mastering geology ... by a landslide!

[@medea27]

Thanks for another brilliant lecture…. the opening clip certainly grabs the attention! I’ve been on a geology-binge watching USGS & Geological Society lectures, and I’m thoroughly enjoying the talks on post-fire debris-flows & Hawaii’s volcanism thanks to the concepts I’ve learnt in your lecture series 👍 (incidentally, the only term that makes me shudder more than ‘lahar’ is ‘pyroclastic flow’…. both equally terrifying) Just last night I watched the spectacular drone footage of the rockslide on California’s I90 (not long ago on Oct 24 2021) where 7,000 cubic yards of granite & rock was triggered by a storm - when you use the people & vehicles for scale, the size of the fractured rockface & the truck-sized boulders spilling over the road are mindboggling! Thanks also for including snow avalanches… I think people underestimate the hazard of snow-slides as a transport mechanism for debris that's equally dangerous as mudslides. Their geological & environmental impacts just tend to be hidden until the snow melts.

[@khavyvath22]

My final for earth science was today so unfortunately I won’t have to watch your videos anymore, just know that your videos have helped me ACE my class. I wish I could pay you instead of my college because you were a much better teacher than my professor! Thank you for everything!

[@khavyvath22]

The only subject of my class your videos did not cover were Karsts. You should make a video on that! :)

[@jp216]

You can still watch them.

[@transamgal9]

@@jp216 yep!

[@EarthandSpaceSciencesX]

@@khavyvath22 It's on my list!

[@transamgal9]

@@EarthandSpaceSciencesX i live on top of it! Yikes!

[@Saucyakld]

The times we had to stop on the road as a landslide had occured in the Coromandel in New Zealand are countless. My husband has to drive super careful! But the beauty is breathless!

[@michaelstapelberg7751]

love that famous rock fall picture so many views of it... its a classic

[@grauergerald9971]

Excellent !!!

[@Bubba_fett]

Thanks I really love this stuff. Its nice to be able to look out over the land and tell your companions just how it got that way.

[@EarthandSpaceSciencesX]

Glad you enjoyed it!

[@craig5522]

@@EarthandSpaceSciencesX ¹1¹1¹11¹1¹¹11111¹

[@craig5522]

@@EarthandSpaceSciencesX ¹¹¹¹

[@lindaberl3712]

I am a person who likes rocks, and in the last few years I have begun to try to learn more about them. I was recently visiting a relative in Reno, and noticed evidence of a mass movement of hillside below where they live. There was a huge area of landslide. It concerned me as the debris was clearly unstable, and my relative’s house sat on the ridge above it. I later mentioned my observation to them (the area is very prone to earthquakes), and they quickly dismissed my concern. I could easily picture that portion of the mountain sliding down. I am not sure how to get them to take my warning seriously. Your video on the subject was very helpful, I will share it with them and pray they watch it and connect the dots.

[@jeffholmes1362]

Thanks for another informative video.

[@whitby910]

Superb, thank you.

[@EarthandSpaceSciencesX]

Thanks!

[@edlicsathiamurthy4520]

Great lectures, learned a lot

[@creatingreality291]

Yes. They can be spectacular..

[@huseno1148]

Thank you for coming back....I love your classes sir keep going.....you are one brilliant teacher

[@EarthandSpaceSciencesX]

Thank you! I certainly plan on doing this a lot more...the public response has been wonderful.

[@MasterMalrubius]

@@EarthandSpaceSciencesX I concur with the comment. These videos are full of info but you present it very well and make it enjoyable to watch.

[@uzunerfatih]

The same!!

[@uzunerfatih]

I watch more than once some of your works. Love them!

[@huseno1148]

@@EarthandSpaceSciencesX I am a student of Geology 2nd yr and your classes really help me..... If I graduate be sure your classes were one of the main reasons..... hopefully I will do Minerology thanks again 💪💪

[@complimentary_voucher]

Subscribed! We love your narrative style, great pics too. Cheers from New Zealand.

[@EarthandSpaceSciencesX]

Thank you so much! It means a lot to me.

[@mhafemann]

Yes, well done !! 😍😊😎🎶😃✨

[@maggot129]

this is very interesting !

[@cpchehaibar]

What a great intro!

[@Antoinelemotcoeur]

I have been studying geologie since I was a kid (now 65 years old), started out with caving. I never learned about géologie in school, only in books and observation. I found nothing new to me on this subject, but nothing missing either. Except maybe some additionnal detail as to why dry sand will sometimes act as water saturated sand. The required condition being the expansion of the gap between sand particules because of water or an important source of vibration. Like shockwaves from tremors and explosions, or a mecanicaly shaken metal barrel (for sand molding) and even wind carrying sand dunes. I'm looking for more info on mineralogy so I subscribed!

[@oliviachipperfield6029]

Scree slopes are fun!

[@timkellerman4890]

Thank you for a very informative and interesting program. Your concentration on making for we laymen is much appreciated.

[@brendacooper5729]

Sicamous BC in 1978 had a really brutal rain and anice slide came down and crossed a small side road, took out a garden shed, missed most of the few houses on the road and luckily no injuries, about a year later three of us decided to take a hike up the slope behind a brand new house being built, the slope was extremely steep and studded with loose rocks, at one point a rock I had my hand on came loose, my friends sidled around me, I edged over to one side before I let go of the rock, the slope was so steep that the rock went bouncing off down the hill collecting a few companions on the way. My friends and I decided we did not want to climb that hillside after all, and you could not have paid me to live in that fine new house they were building. I don't know if they had any more landslides along that road since, as I moved away, but the last time I drove along that isolated little backroad on a visit in 2010 it was wall to wall houses . Another slide like the 1978 one will take out a few houses and probably some lives, people are fools, and the people in charge of zoning should be held resposible for allowing it, unfortunately greed always wins over common sense.

[@uzunerfatih]

Thanks!!

[@richardrobertson1331]

I'm currently mining an alluvial deposit in Nevada and don't fully understand how it formed. There were obviously periodic small streams scattered in its depth, and that's where I find the most concentrated minerals, but I don't see enough surface disturbance to locate other small ancient streams. They are not limited to where the current gullies are located. It has obviously been an arid landscape for eons of time and when I locate an ancient stream by randomly digging, the black sands in the stream's depth are solidified (consolidated) and oxidized. I suspect they are a few million years old and some stream beds are somewhat broken up. Any idea how I can locate more such ancient small stream beds? They are too deep for my metal detector to pick up and I don't have the funds to do a lot of random test drilling. And thanks for such a wonderful series of lectures. You put things together so well and make things so easy to visualize and understand.

[@robbie_rohm88]

You are mining? Like, how? In a mine on your own property? I f*cking love Americans!!! I mean, who has a mine??? Where I live, the government would send out the goons to kick my head in if I started digging my own mine!!! ‘MER’CA!!!

[@TheBandit7613]

@@robbie_rohm88 You find minerals you want to mine on public owned property, file a mining claim, and start mining. Look into how to file a mining claim. It's EASY to make money here with a little motivation. Wanna make lotsa money? Move here. Most people who live here are not motivated. They are happy just getting by. Over 80% of Nevada is public land with plenty of minerals. Gold and silver. It's called the Silver State.

[@richardrobertson1331]

@@robbie_rohm88 yes, I'm doing it on my own. I located land near an active gold mine that was not protected by someone's claim, found some rocks that looked like they contained gold, sent them off for an assay (cost $40), filed a claim with the county government then with a federal agency (BLM), paid both their fees (about $450 total). I also put up markers (called monuments) and corner posts, paid a reclaim bond fee and started metal detecting and a little digging with a scoop or hand trowel and a few buckets. They refer to my "mining" as "recreational" or "casual" mining. I'm 76 years old and was being treated for lymphoma cancer last year when I started, so I needed to get my mind on something interesting. It's a four hour drive from my home and I don't visit the mine if the ground is frozen. It's many miles to the nearest town and I have to bring my own water and food and a sleeping bag. I'm building a hammer mill rock crusher in my garage and I have a metal detector. For me, it's all a very small scale activity; I have no money for big equipment or workers. However, it is so fun and exciting that I think about it all the time. I even dream about it. I'm usually there three days every week and my wife thinks I'm still alive because of all the work I do there. If you are not a citizen of the US, you can still file your own claim on BLM land, but I think you need to do it as a US corporation. Check with the BLM rules and regulations on that point. They are friendly people to work with and very helpful with all the paperwork. Robert, what country do you live in? It doesn't sound safe there.

[@oliviachipperfield6029]

@@richardrobertson1331 wow! Good for you! What a fun life you are living.

[@robbie_rohm88]

@@richardrobertson1331 I live in Australia. I wish I could leave this country and live a free life like that. Very, very jealous. Oh, by the way, NEVER give up your guns.

[@azengoose1070]

This video is pretty good, like the other lectures. Lots of good image examples. Added my like. I have a feeling the dislikes on this one is more a reflection of the subject of obvious tragedies that underpin the topic than about the merit of the lecture itself.

[@bradriney919]

Coastal San Diego has a wonderful example of mass wasting preserved in the Cretaceous marine Point Loma Formation where a granitic mountain slammed into a deep bay just east of Palomar Airport at Carlsbad CA. This was beautifully exposed during road construction. The "disaster bed" was exposed sandwiched between a lower and an upper fine grained member of the Late Cretaceous marine Point Loma Formation. The huge sharply angular granitic blocks, some over 25' across served as an undersea rocky marine environment where a rich variety of rock scallops, oysters and other marine life flourished on them immediately after the event. The event was very Lituya Bay like. The line between pulverized granitics and overlying quiet marine siltstone is pencil thin with the huge angular granitic clasts extending above the upper event horizon into the overlying richly fossiliferous siltstone. This disaster bed is approximately 30' thick and consists of solely of these huge clasts suspended in pulverized granitics. A "Moment Frozen In Time" preserving a bad day in the Cretaceous to say the least!

[@shailajanayak2091]

Nice videos. Tks.

[@marianfrances4959]

Thank you! 👍🧦🇨🇦🌲

[@resetmodeon5254]

0:40 that kinda rock keep falling of on my city surrounded by mountain city lives at the bottom of the mountains, you keep witness the buildings you knew gone next day and that huge rock or evevn bigger is instead there, like the school there, it was gone rock took place there, i have even seen one live rolling doin the river, boy i got chills there when i saw it🥺

[@allancrow134]

"For 300 years it seemed like a good idea." LOL

[@robbie_rohm88]

It was a good idea. “Until it wasn’t.”

[@jamesburke6078]

Harper's ferry west Virginia has closed 340 down do to landslides... about 3 miles from were I live....I have an old rock slide in my backyard

[@miklov]

Great stuff. Only had time for the beginning but will come back for the rest =D

[@ahmedmohumedabdullahi]

Thanks

[@user-by1fq9wr1f]

Вау ! Хвала на информацији . Поздрав из Србије .

[@mattlloyd9054]

One of the largest areas of erosion bigger than the grand canyon or the valley in Bhutan is the coal fields of ky, wv, va, and tn. This Cumberland plateau area dwarfs the 2 mentioned. I describe the area like a gigantic grand canyon with trees on the walls. That said the breaks interstate park in the region is called the grand canyon of the south.

[@chriscoast2coast1207]

Thanks for sharing ❣️

[@EarthandSpaceSciencesX]

Happy to know you enjoyed it.

[@candyflair7946]

People do have a tendency to live in the worst possible areas. I'm temporary in wet lands below dams. Temporary with emergency escape plans.

[@MrLotrecht]

The Angle of stability is 60 `degrees. In Germany we call it the ``Lastabtragungswinkel`` Is one of the importants angle in construction !

[@allangibson2408]

Stability depends on the soil. Angle of repose can be almost zero with some clay soils which can liquify at the slightest provocation… Talk to a Norwegian soil engineer about it…

[@johannesarijonsson4933]

Thanks for this lecture. This is very interesting subject .

[@EarthandSpaceSciencesX]

Thanks!

[@centexan]

Terra forming the old fashioned way. Evidence is everywhere.

[@rodneycaupp5962]

Add vegetation to most slopes to stabilize the soil . 90% of his examples showed an absence , as if deforested of trees, no vegetation at all. Flood irrigation in a California peach orchard ..., imagine that.

[@EarthandSpaceSciencesX]

That's for sure. The removal of vegetation from slopes by human activity or wildfires is one of the biggest triggers for landslides, especially liquified landslides like mudflows.

[@kirkthiets2771]

I live in Colorado. I have taken extreme hikes in the national forests. I have nudged massive rocks just enough to send them down. Some go through trees like they were tooth picks. (Awesome demonstration of kinetic energy.)

[@mohammadistiyak8816]

Thnks for sharing

[@EarthandSpaceSciencesX]

Thanks for visiting!

[@moonstoneway2694]

Your videos are always so interesting. And I just learned the word scree while doing a crossword puzzle the other day and now here it is again.

[@moonstoneway2694]

There are some interesting rock formations in Zen Hiking Switzerland videos. Breathtakingly beautiful photography in the Finding the Most Secluded Cabin in Switzerland one. Pretty sure there's some scree in it too. Just thought I'd mention it to this group of earth-minded people. Thanks.

[@almeisam]

I was hoping you would have had the Slumgullion Earthflow shown in the earthflow section.

[@EarthandSpaceSciencesX]

Indeed, it's a spectacular earthflow and it was one of the earthflows I strongly considered showing. Anyone who sees this comment should check it out on their own: en.wikipedia.org/wiki/Slumgullion_Earthflow

[@massimosilvestri2006]

Very interesting lesson. I'm involved in geology as an hobby especially in tectonics. In the photo I show a stone of Esino limestone, about 230 MY. Thanks for your lesson. Massimo

[@margaretoni4309]

Great Teaching. Thank you for sharing

[@EarthandSpaceSciencesX]

Thank you! :)

[@margaretoni4309]

@@EarthandSpaceSciencesX You're very welcome!

[@nigel900]

Set aside all the coulda, shoulda and woulda’s, then consider this…. They built a house with garage, and a vineyard… operated it for 300+ years, at the cost of the garage. Pretty good deal, if I say so myself.

[@RaizesOrganicas]

O tempo e a gravidade é para tudo e para todos.

[@EarthandSpaceSciencesX]

De fato

[@jeffbrunswick5511]

Loving these lectures. Incredibly interesting and well explained.

[@EarthandSpaceSciencesX]

Thanks!

[@relaxingbeach8571]

Wonderful, so amazing geological information.

[@8023120SL]

In my part of Australia when we refer to "high ground" you actually need surveying equipment to detect it! A topographic map of an area that contains multiple farms may not have any contour lines on it at all. Landslides are not something we spend a lot of time thinking about lol

[@ThatsWhenItkickedin]

Everybody should be watching these videos. Thanks for this, very informative and interesting

[@EarthandSpaceSciencesX]

Thank you!

[@mattsharpe3989]

Really appreciate the missing lectures being filled in, awesome as always, thanks Paul!

[@EarthandSpaceSciencesX]

It's been fun and the public response has been overwhelming. I'll keep 'em coming as best as I can!

[@cherylm2C6671]

Seismic creep as well as water/ice action may play havoc with both hilltop orchards and ski resorts. China seems to have a different strategy for handling water on hillsides. How quickly liquefaction profiles change may determine what land can be in residential use.

[@gracekeepsittogether4322]

I highly recommend 👍👍 Recently asked if n-e-body can recommend vid/lects along this line. Bam- here his video comes as I wanted [to learn w/ no prior knowledge, w/ will 2 learn] perfectly. Look forward 2 more along this line. Why some 'mountain ' have layered look/colors or some shaped 'monuments ' are as is. Meanwhile others seem shaped multi-hexagon like? Anybody know?I'll Just start look at if he .....

[@selmamuller1387]

Isso que é aula de geologia! Acabas de ganhar mais um inscrito!

[@EarthandSpaceSciencesX]

Muito obrigado!

[@elekid330]

It is surely caused by the minimal to no drainage to over saturated by that undrained water and the water weight of the water that doesn’t drain for use of watering the growth and product

[@markdsm-5157]

as a kid i lived close to one of those areas in California were they actually built on the mountain side. Every time something slide, the home owners were made out to be victims in need of support. I don't mean to be callous, but what did these people expect? It's like those people here in the midwest (where i live now) that build on flood planes, insurance not covering them should be a redflag, but yet they do it, and then they ask for help when it finally happens.

[@rumpelstilzchen2194]

don't know how I ended up here, Great lecture ! Now I wane know more

[@EarthandSpaceSciencesX]

Happy to have you study with me! Here's the playlist: kzbin.info/aero/PLcI_lGDDt5A65hZDfQVPMEUzDRYYXWHoy

[@rumpelstilzchen2194]

@@EarthandSpaceSciencesX Thanks, love the lectures, very easy to follow and understand.

[@b_uppy]

Think this important because you can see the factors that contribute to landslides, as well as problem solving thru water management, etc. It's a mistake to ignore the role of biology. At 21:21 shows a failed cliff with a conventional orange orchard at the top. It features what looks like a steep trail that likely featured in the cliff's demise as the trail likely affects drainage as well. That the orchard is using conventional agricultural practices is a likely culprit (instead of just blaming it on draining or harvesting water). Monocropping is deleterious. BARE GROUND around trees, heavy chemical use, compaction from heavy equipment, loss of soil fertility, loss of mycelium/ healthy soil biota, irregular water absorption, hydrophobic soil surfaces, etc all contribute to erosive forces. Polycropping ensure zero bare ground, uses biology to create soil that holds water evenly instead of irregular retention, promotes natural biological agglomeration of soil to roots, reduces compaction, promotes mycelium that move water through the mycelium itself in a protective way, increases resiliency, etc.

[@EarthandSpaceSciencesX]

I have two videos in my environmental science playlist that deals with these very issues.

[@b_uppy]

@@EarthandSpaceSciencesX I'll see if I can find them later. Thank you for the heads up.

[@rapturebound197]

Its called life...things happen. Harsh but true.

[@jonglewongle3438]

32:00 - the 2015 Nepal earthquake. An Australian expatriate got killed in that. An article about that in an Australian metropolitan newspaper. Some young bloke deciding to harp around in Nepal rather than Australia. People sometimes do that. They go abroad to see how much time they can rack up away from home. Don't know that he struck a rich ore of weed or pot. Don't know that to have been the case. But not working there. Cash machine money from home.

[@samuelkeystone]

The rocks in the first example could have hit one of those 144,000 volt power transmission towers and dropped high voltage on the house.

[@elfootman]

For the boys!!!!

[@hippopotamus6765]

I'm looking at hills and valley's much closer now.

[@mohammedsarhan9213]

من افضل الجلوجيه في العالم من ناحية الطبيعه هيه المملكة العربية السعودية الدرع العربي مكشوف ماعليه غطاء واصبح في المملكة اهتمام كبير بجميع فروعها قسم صخور ومياه وبترول وتربه

[@jp216]

During min 47:00, the debris slide would be considered as breccia rock eventually right, once it solidifies? And the same can be said about mudflows, right? So, given that it's a sedimentary rock and varies animals really fast, is it possible to find fossils in ancient mudslides?

[@EarthandSpaceSciencesX]

Great questions and you are exactly right! You are taking an accurate step beyond what I mentioned in the video and into what would be discussed in a sedimentary petrology class, typically a 3rd-year level course. The events at 47:00 would create a "debris flow breccia" deposit. Mudflows, if they are dominated by mud but also carry anything the size of cobbles or boulders, would form something called a "parabreccia." In terms of fossils, the answer again is "yes" we can find fossils within these rocks though they can be very challenging to find. Since they aren't marine rocks, they don't contain the microfossils that make dating marine deposits so easy. Instead we have look for bones of what are usually vertebrates...and you can imagine that anything caught in these debris flows gets ripped apart pretty quickly. Typically the fossils we usually find are parts of jaw bones, parts of femurs, or perhaps some teeth, and sometimes we find nothing at all. It can make dating ancient breccia deposits very troublesome. Cheers!

[@grahampearce2405]

Have you done a program on Tenerife, i.e the potential for a massive landslide. aka the Cunbre Viejta tsunami hazard. ps. Your lectures are fantastic, I have been binge watching them for the last week.

[@EarthandSpaceSciencesX]

Thank you for your kind comment! I have a deep interest in the geology of Tenerife but haven't yet done any content about it. I may add it to my growing list of topics though.

[@davidkelter8379]

Fantastic session. Thank you. Is creeping the process responsible for the edges of sidewalks and driveways being overgrown by soil?

[@EarthandSpaceSciencesX]

Thank you! In many cases creeping soil can do that. Another way that happens is by expanding soils (some soils swell when wet and contract when dry forming ground cracks) which can also make this happen.

[@gailbracy3813]

@@EarthandSpaceSciencesX That's Houston TX. Sometimes sidewalks will crack overnight. Plus, there are faults in mostly N. Houston. You learn soon enough that if you own a house, you will most likely have foundation issues.

[@jlawrence0181]

That was a very impressive lecture. Do you have a biography somewhere?

[@EarthandSpaceSciencesX]

I hadn't posted it anywhere since I figured people cared more for the information than for me (which is why I didn't even put my name on the video). What information are you interested in specifically? I can answer it here.

[@EMarcisz32]

nice explanation to what happened last fall in southern BC, Canada or this early summer in Yellowstone, I mean here the landslides triggered (not caused;) by "atmospheric rivers". Most of them washed out chunks of highways (they often run between steep slope and river), could the vibration from the traffic be a significant addition to the landslides?

[@EarthandSpaceSciencesX]

Vibration is an interesting question and I don't have the research handy to answer that. When earthquakes happen, landslides are a common result to vibrations do cause landslides. All I can say regarding traffic-caused vibration is it is a possible factor, but I don't know the answer for sure.

[@zack_120]

19:00- no one could tell what would happen for this obvious potential landslide structure which is only a matter of time 😱 57:40- this type of earthflow looks very weird almost ghostly

[@elleon3880]

IT IS NOT A PLANET, BUT A WORLD.

[@jp216]

During minute 12:29 the river is pretty curvy (like meanders and the same is seen in some areas of the Grand Canyon). Does that mean these areas were flat like the missipi river and there was some uplifting? I know grand canyon is less than 3 million years. So what's the explanation for meander shape because I understand they appear in flat plains right.?

[@franciskolarik6802]

Meanders and braids change faster than uplift. i don't know the area, but would guess the mountains are the source of the river more than the river was there before the mountains. (That does happen, and leads to some interesting landforms.) The river and the mass wasting are literally carving out that valley, and filling the floor so that it becomes flat. Meanders are all about slope and therefore current speed, and how much erosion and deposition are happening, and where. But they change because you have an erosional regime on the inside curves, and a depositional regime on the outside curves. On a plain, the river isn't constrained by hills or mountains, so you can get much crazier meanders, oxbows, and braiding.

[@brucewinningham4959]

Excellent Lecture & Video!. I can kind of understand how & why Rock Slides tend to originate at OR near the tops of Mountains. QUESTION:: How "Likely" OR "Unlikely" are Soil & Rockslides Prone to originate "At OR Near" the Bottom of Mountains? I am sure Physics plays a Major Role. Does the weight of the Geologic Material above help hold the Material Below in place? THANK YOU.

[@EarthandSpaceSciencesX]

Great question! Landslides do commonly occur at the bottoms of mountains due to “oversteepening” or due to erosion of the slide toe which can be caused by wave erosion along a coastline or rivers cutting into the bottom of the hill or mountain.

[@brucewinningham4959]

@@EarthandSpaceSciencesX -- Great Answer. THANK YOU Professor.

[@brucewinningham4959]

@@EarthandSpaceSciencesX -- I am an Ex-driller (Oil, Gas, Water Wells, Blast Holes, GeoTechnical, etc.). How successful has it been to Drill holes to bedrock from the top of a Slope and insert Heavy Wall Steel Casing, to be filled with Concrete or Cement, to be Anchored a Short Distance into Bedrock as a means of GeoHazard Mitigation? THANKS In Advance.

[@tornado5578]

Como disse Cristo: Todo monte se derrumbara, é os caminhos tortuosos se aplanaram. Por isso não temas ,quando verem essas coisas acontecendo ainda não será o fim ,mas o princípio das dores.

[@legoteacher1]

This is why I live in a valley😏

[@salvadorsoriano4734]

Thank you for this presentation. It sparked again my interest in Geology, a subject a had back in 1965 when studying soil science.

[@ahmadsyaikhu498]

الله اكبر

[@locxamvlog8414]

Lộc chào anh chúc anh mạnh khoẻ vui vẻ làm nhiều video hay

[@Bunchoeves]

5.1 MILLION views! Dang! Closeted rock lovers.

[@geraldmicallef6575]

People do not released when they do their building next to a mouthing like that.?

[@eisaimk3307]

Look in Apocalypse....you can se the present

[@eatabagofdicks6500]

👍

[@percontatio9172]

The reason it's not possible to get out of a mudflow is not density, I think, but viscosity. If it was as fluid as water but 2x denser, it would actually be very easy to float to the top of it. High viscosity means you cannot swim up to the surface of it or free your arms and legs if they become covered. [edit: high density means it's more destructive to buildings, structures, people if it hits with momentum]. Thanks for great videos by the way!

[@EarthandSpaceSciencesX]

You are right, viscosity is a major factor in these events.

[@ahmedmohumedabdullahi]

I request you to deliver your slides

[@plutus205]

I always felt like cliff homes or homes built on mountains are like a Hot Potato.

[@mariagraca6934]

Alguém sabe o que DEUS DECLAROU NO LIVRO DO APOCALIPSE? SOBRE ESSES EVENTOS?

[@mdp38883]

I’m wondering why you didn’t showcase and use the Oso, washington landslide in this video.. it was a rotational landslide that moved a cubic mile of material a distance of over a mile in less than 1 minute. Killing 50 people and choking off the upper stillaguamish river also creating a temporary lake.

[@EarthandSpaceSciencesX]

Good question. The reason is because I use this very same presentation for my students in my face to face classes and then we do a lab example with a focus on the Oso Landslide. I also have them watch a documentary on the topic. Basically, I don’t want to burn them out by focusing on the same landslide over and over again. I have them to learn the different types of landslides and then apply their learning to real world examples, chief of which is Oso.

[@mdp38883]

@@EarthandSpaceSciencesX awesome thanks for reply. I had family members in the slide, and it is what has gotten me into studying geology. I wish to receive a degree in geology focused on primarily landslides. I’ve watched your whole series on geology several times over now. But the latest time it seemed the lecture on atomic matter had been removed.

[@yositakhemthong5924]

ภาพนี้สวย ภาพที่ปรากฎในคลิป เวลา 12.34 น.ที่ไทยก็มีนะที่เขื่อนลำตะคลอง สวยมาก รุ่นพี่ที่ดิฉันรู้จักเคยไปดับไฟป่าแล้วพบความสวยงา ม ก็เลยแวะไปเที่ยวกันหลังจากพาเยาวชนไปปลูกป่าและสอนให้เยาวชนรักษ์ป่า สถานที่แห่งนี้ เมื่อก่อนใครก็เข้าชมได้ แต่ปัจจุบันถูกนำไปเป็น สถานที่พักของ... ใครก็ห้ามเข้า ..นี่ไงล่ะ ประเทศไทย ถึงต้อง สมควร ปฏิรูปไง .. ทำไม ป่าไม้ประเทศไทยถึงเหลือน้อยลง แต่กลับมี รีสอร์ท มี.. ขึ้นเต็มหุบเขา. แล้วจะไม่ให้ประชาชนพูดได้ยังไง?

[@cryptidnomad3850]

Should build a house in front of the big boulder now

[@knocksensor3203]

Everything is following gravity

[@sethalim8283]

World #landslidles

[@americanwoman6246]

Why don't canyons round off? The size of the river carrying off debris? Why are canyons straight walled like quarries? It doesnt fit your model.. Please help..

[@EarthandSpaceSciencesX]

Not sure what you mean by “round off”. Canyons are not straight-walled because the processes that form quarries and valleys are quite different.

[@jamesruscheinski8602]

human nature.

[@tripurakafle5914]

8

[@user-mi9qg8ti3f]

大自然的反撲 太嚇人了

[@EarthandSpaceSciencesX]

山體滑坡絕對可怕。