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Watched the Mythbusters episode years ago where they built a house on a shake table and experimented with best place to take cover in an earthquake. And it was indeed under a sturdy table holding on.
Fantastic video. I was thinking just the other day how I wish I had been able to study geology when I was younger. Then you post videos like this and I feel like I’ve been given the chance again, thanks so much!
I love this series you are putting together. I am not a student but I do find these very interesting. Getting under an IKEA desk, like most people have at home will probably not offer much protection, lol.
Part of the Earthquake scenario in Emergency Management, CERT, Red Cross Disaster and First Aid/Wilderness First Aid et al training, is to (1) Get under a desk, table, or sturdy/heavy furniture, (2) Put your one hand and forearm over your head and neck, protecting you from bumping your head/neck with the furniture - let alone any falling objects, and (3) with the other hand hold onto the (movable) desk, table, or sturdy/heavy furniture keeping it in place, but also keeping you under furniture at all times.
@@Sinderbad Been there, done that. The reason they changed to this method - is that the desk, table, or furniture would shake and walk away from the covered individual and then they would get hit by falling debris. So they went for the 1 hand on head/neck, and 1 hand holding the desk, table, or furniture in place, or the person would crawl with the moving furniture !
The one EQ noted inside the African continent could be associated with the Great Rift that runs from Africa to Israel/Jordan, up into Turkey and Russia. This is the expanding earth rift of Ethiopia, that extends far south into this region.
I kind of taught myself what to do in an earthquake. 1983 Borah Peak earthquake. I ran outside. When I saw the power poles waving and the lines swinging I went…oh this isn’t the place to be! Went back in and stood in the doorway. Ok…now I know to get under a table or desk.
Growing up in Los Angeles in the 60s and 70s and 80s feet, the official instructions for work for people to stand in a doorway during an earthquake. I know this has changed since I left LA. My brother-in-law was in San Francisco when the big one hit in 87. At that time, everyone was still being told to stand in the doorway. He found all of the doorways were full of people already when he got there.
Really a great explanation of earthquake waves. In the late 60's I was in an Air Force organization monitoring for underground nuclear detonations. We used the seismic waves to identify and locate the sources of these detonations. Energy wise, even large detonations are very small compared to earthquakes. We primarily used the P and S waves to determine distance and magnitude. Distance was calculated based on propagation time between the P and S wave, and amplitude of the signals at that distance gave us an estimate of the magnitude. One thing that may help in understanding of the Raleigh surface wave (the second surface wave) is to describe it as a corkscrew pattern going through the earth's crust. In the 60's it was described as an elliptical retrograde motion. Because these waves move both horizontally and vertically in a circular motion, these waves result in cracks in an X pattern on the side of a vertical concrete walls, and are the more destructive of the surfaced waves.
I live in the New Madrid seismic zone... yes, that purple part in southernmost Illinois. Interestingly there is a fault system called the St. Genevieve (MO) fault that extends down into southern Illinois; it actually can be seen in aerial maps by those with keen eyes for that. The fault itself bisects my hometown (Anna) and the town next to it, Jonesboro.
Thank you, Shawn, for another easy to follow video. I have always been fascinated by volcanoes and earthquakes since I was a child but you make it easy to understand and clarify what has been confusing for me in the past. I am looking forward to you making earthquake magnitude easy to comprehend as well.
Thank you for another great educational clip! We get intra plate earthquakes in Australia. Nothing like plate boundary quakes but they can still be a good shake when they come through. Last one we had in my area was 2015 and could hear the movement in the house.
When your phone tones and a USGS earthquake notification is received, activate the video camera on your phone and prepare to simulcast the event on social media….😜
In 1949 my mother and I were in Seattle waiting to board a passenger ship to go to Japan where my father was stationed. An earthquake struck and my mother and I stood in the doorway of the hotel we were in. My mother was born in Texas and as far as I know had never experienced a quake. I still remember watching the Murphy bed slam between open and closed.
The doorway myth, to the best of my knowledge, originated in my home state of CA where older building codes allowed for wider spacing (often 36" or greater) between beams in supporting walls, and very little cross-bracing. since doors are often around 30" wide the spacing of supporting beams was tighter, thus doorways were actually marginally more structurally sound. Codes were updated after the 1971 Sylmar EQ, and now require beams to be no more than 16" apart. Important to keep in mind that in non-residential buildings like schools and hospitals doors tend to be much heavier and can have much more inertia when swinging freely if left open.
18:17 My country The Netherlands has an increased risk due to an active normal fault in the southeast. in 1992 there was a damaging magnitude 5.8 quake on that fault and in 1932 a magnitude 5.0
But besides that, we have the quakes due to natural gas extraction in the northeast. I wonder if there is some explanation why, although those are usually below 2.5 magnitude, it absolutely freaks the inhabitants out. Is it only the fact that the country has little history in earthquakes, so we are not accustomed and not prepared (buildings are not constructed to be earthquake proof), or is there some other aspect to these quakes that makes them different from those caused by faults?
I remember seeing a picture of a building in Mexico City that pancaked in a large quake, but you can see the desks holding up the floors, so there was a survivable space left.
Back in my geology days we called surface waves “L” waves. During the Loma Prieta earthquake i was in Sacramento in a two story office building that looked out upon a basketball court. The waves were distinct and identifiable. I told the people sitting with me that that was a large quake, far enough away for the P,S & L waves to be segregated by the varying speed of each wave type.
I have a question about option E. earthquake response. Getting under a sturdy table, etc. What keeps the building from collapsing and falling in on you smashing you under the table, burying you under a pile of debris, possibly killing you? None of the options looked good to me.
Question. If you please Shawn. I am just watching a documentary on the 2011 Japan Magnitude 9 earthquake. It lasted for 10 minutes in some areas. How much earth movement actually occurred in metres etc to result in that magnitude 9?
My wife can feel those rarely felt waves. We were visiting Mt. St. Helens a few months ago. She asked if I felt anything I said no. She said she thought she did. We get back to our hotel I do a quick research for the time we were there & sure enough 2 small earthquakes did occur. They showed in 2.blah range.
Even small earthquakes can cause injuries. In 2015 a 4.1 struck north of where I live late in the evening while I was in bed. My cat used me as a launch pad in her haste to take cover. I had bloody claw marks on both legs. 😁
So, all these years, I thought I was feeling the P waves, but it's been the S waves. We have a lot in Humboldt, and I've grown accustomed to judging our earthquakes by that first felt jolt. Now I'll be looking for two before the real shaking starts 😂 Thank for the postings!
I'm late teach but I've got a note from Epstein's mother 😂🔨 EDIT::; I was attending Boise State University in August of 1983 or September I was the first one to notice the earthquake and I said earthquake and I went outside I was closest to the door and I was directly across from Broncos stadium I watched the 100 ft tall lights Bronco 🏟️ move in an ark I'm estimating at least a 15-ft swing in each direction within a few seconds overall swing of 30 ft movement , I remember looking at the other guys in my class and none of us took our eyes off from that stadium. On October 28, 1983, a magnitude 6.9 earthquake struck the Lost River Range in central Idaho, USA. The epicenter was located near Borah Peak, approximately 44.08°N latitude and 113.8°W longitude. This earthquake is considered the largest and most significant to affect Idaho. Impact Two schoolchildren, 7-year-old Tara Leaton and 6-year-old Travis Franck, were killed instantly when a stone storefront collapsed on them as they walked to school in Challis. RIP
Sean, you forgot the part where the Sun created a solar flare or a coronal mass ejection, which then went into a proton storm. Then the proton storm affects the beaufort_gyre and gets absorbed by the polar caps ...... You can't talk about Earthquakes until you talk about the liquid sun model or DR.Robataille .... or be the laughing stock of geophysics, please, you have time to make a decision and understand that the Sun controls Earthquakes. It never has not
Please LIKE and SUBSCRIBE. I also appreciate your continual support of these geology education videos. To do so, click on the three small dots (right of Download button above) then click on "Thanks") or you can go here: www.paypal.com/donate/?hosted_button_id=EWUSLG3GBS5W8 Or: www.buymeacoffee.com/shawnwillsey
Watched the Mythbusters episode years ago where they built a house on a shake table and experimented with best place to take cover in an earthquake. And it was indeed under a sturdy table holding on.
Fantastic video. I was thinking just the other day how I wish I had been able to study geology when I was younger. Then you post videos like this and I feel like I’ve been given the chance again, thanks so much!
Just study space weather.Because that's what creates the earthquakes in the first place
I love this series you are putting together. I am not a student but I do find these very interesting.
Getting under an IKEA desk, like most people have at home will probably not offer much protection, lol.
Thanks for all the hard work on these videos!
Part of the Earthquake scenario in Emergency Management, CERT, Red Cross Disaster and First Aid/Wilderness First Aid et al training, is to (1) Get under a desk, table, or sturdy/heavy furniture, (2) Put your one hand and forearm over your head and neck, protecting you from bumping your head/neck with the furniture - let alone any falling objects, and (3) with the other hand hold onto the (movable) desk, table, or sturdy/heavy furniture keeping it in place, but also keeping you under furniture at all times.
Reminds me of what we were taught in grade school during air raid drills in the 1960’s, only both arms went over your head.
@@Sinderbad Been there, done that. The reason they changed to this method - is that the desk, table, or furniture would shake and walk away from the covered individual and then they would get hit by falling debris. So they went for the 1 hand on head/neck, and 1 hand holding the desk, table, or furniture in place, or the person would crawl with the moving furniture !
The one EQ noted inside the African continent could be associated with the Great Rift that runs from Africa to Israel/Jordan, up into Turkey and Russia. This is the expanding earth rift of Ethiopia, that extends far south into this region.
I kind of taught myself what to do in an earthquake. 1983 Borah Peak earthquake. I ran outside. When I saw the power poles waving and the lines swinging I went…oh this isn’t the place to be! Went back in and stood in the doorway. Ok…now I know to get under a table or desk.
Growing up in Los Angeles in the 60s and 70s and 80s feet, the official instructions for work for people to stand in a doorway during an earthquake. I know this has changed since I left LA. My brother-in-law was in San Francisco when the big one hit in 87. At that time, everyone was still being told to stand in the doorway. He found all of the doorways were full of people already when he got there.
On your seismogram that you presented I thought I was looking at an electrocardiogram readout that noted ventricular tachycardia. 😎 nurse here.
Really a great explanation of earthquake waves. In the late 60's I was in an Air Force organization monitoring for underground nuclear detonations. We used the seismic waves to identify and locate the sources of these detonations. Energy wise, even large detonations are very small compared to earthquakes. We primarily used the P and S waves to determine distance and magnitude. Distance was calculated based on propagation time between the P and S wave, and amplitude of the signals at that distance gave us an estimate of the magnitude. One thing that may help in understanding of the Raleigh surface wave (the second surface wave) is to describe it as a corkscrew pattern going through the earth's crust. In the 60's it was described as an elliptical retrograde motion. Because these waves move both horizontally and vertically in a circular motion, these waves result in cracks in an X pattern on the side of a vertical concrete walls, and are the more destructive of the surfaced waves.
I live in the New Madrid seismic zone... yes, that purple part in southernmost Illinois. Interestingly there is a fault system called the St. Genevieve (MO) fault that extends down into southern Illinois; it actually can be seen in aerial maps by those with keen eyes for that. The fault itself bisects my hometown (Anna) and the town next to it, Jonesboro.
Thanks!
Thank you, Shawn, for another easy to follow video. I have always been fascinated by volcanoes and earthquakes since I was a child but you make it easy to understand and clarify what has been confusing for me in the past. I am looking forward to you making earthquake magnitude easy to comprehend as well.
Thank you for another great educational clip! We get intra plate earthquakes in Australia. Nothing like plate boundary quakes but they can still be a good shake when they come through. Last one we had in my area was 2015 and could hear the movement in the house.
When your phone tones and a USGS earthquake notification is received, activate the video camera on your phone and prepare to simulcast the event on social media….😜
Great increases my knowledge of wave types… knew a little but that made sense … thank you Shawn
In 1949 my mother and I were in Seattle waiting to board a passenger ship to go to Japan where my father was stationed. An earthquake struck and my mother and I stood in the doorway of the hotel we were in. My mother was born in Texas and as far as I know had never experienced a quake. I still remember watching the Murphy bed slam between open and closed.
The doorway myth, to the best of my knowledge, originated in my home state of CA where older building codes allowed for wider spacing (often 36" or greater) between beams in supporting walls, and very little cross-bracing. since doors are often around 30" wide the spacing of supporting beams was tighter, thus doorways were actually marginally more structurally sound. Codes were updated after the 1971 Sylmar EQ, and now require beams to be no more than 16" apart.
Important to keep in mind that in non-residential buildings like schools and hospitals doors tend to be much heavier and can have much more inertia when swinging freely if left open.
I just watched a program about the Iznik, Turkey straight line fault earthquake in 2023, pictured.
18:17 My country The Netherlands has an increased risk due to an active normal fault in the southeast. in 1992 there was a damaging magnitude 5.8 quake on that fault and in 1932 a magnitude 5.0
But besides that, we have the quakes due to natural gas extraction in the northeast.
I wonder if there is some explanation why, although those are usually below 2.5 magnitude, it absolutely freaks the inhabitants out.
Is it only the fact that the country has little history in earthquakes, so we are not accustomed and not prepared (buildings are not constructed to be earthquake proof), or is there some other aspect to these quakes that makes them different from those caused by faults?
I remember seeing a picture of a building in Mexico City that pancaked in a large quake, but you can see the desks holding up the floors, so there was a survivable space left.
Which wave causes a table lamp to almost tip over, then set it upright again? Shaking happened after. (Portland, OR. 1980)
Back in my geology days we called surface waves “L” waves. During the Loma Prieta earthquake i was in Sacramento in a two story office building that looked out upon a basketball court. The waves were distinct and identifiable. I told the people sitting with me that that was a large quake, far enough away for the P,S & L waves to be segregated by the varying speed of each wave type.
Geology Hub recently, dec 2024, had an episode on the seismically active regions in America. I have watched it several times.
I have a question about option E. earthquake response. Getting under a sturdy table, etc. What keeps the building from collapsing and falling in on you smashing you under the table, burying you under a pile of debris, possibly killing you? None of the options looked good to me.
But it is the least bad option.
Question. If you please Shawn.
I am just watching a documentary on the 2011 Japan Magnitude 9 earthquake. It lasted for 10 minutes in some areas. How much earth movement actually occurred in metres etc to result in that magnitude 9?
My first earthquake was in Mumbai India, as a baby. Yes the Himalayas were on the move back then!
Preemptive situational awareness for if your in an earthquake moment on your 1st question cause every situation is different.
My wife can feel those rarely felt waves. We were visiting Mt. St. Helens a few months ago. She asked if I felt anything I said no. She said she thought she did. We get back to our hotel I do a quick research for the time we were there & sure enough 2 small earthquakes did occur. They showed in 2.blah range.
B was once advised years back.
In parts of Texas its fracking (lower magnitude earthquakes).
Even small earthquakes can cause injuries. In 2015 a 4.1 struck north of where I live late in the evening while I was in bed. My cat used me as a launch pad in her haste to take cover. I had bloody claw marks on both legs. 😁
17:43 Aotearoa New Zealand is almost completely red.
Is that over simplified map of fault areas? graph not gram is what I learned.
We spend so much time in bed and yet I never hear how they want people to react when the big one hits at 3:17am
So, all these years, I thought I was feeling the P waves, but it's been the S waves. We have a lot in Humboldt, and I've grown accustomed to judging our earthquakes by that first felt jolt. Now I'll be looking for two before the real shaking starts 😂
Thank for the postings!
most arent violent. the ground rumbles.
As I am watching this, was just hit by a 5.1 earthquake in Wellington, NZ. Will still be watching episodes to come 😂 Awesome work as always Shawn!
I have never experienced an earthquake.
I do not believe earthquakes exist.
E
C
I'm late teach but I've got a note from Epstein's mother 😂🔨
EDIT::;
I was attending Boise State University in August of 1983 or September I was the first one to notice the earthquake and I said earthquake and I went outside I was closest to the door and I was directly across from Broncos stadium I watched the 100 ft tall lights Bronco 🏟️ move in an ark I'm estimating at least a 15-ft swing in each direction within a few seconds overall swing of 30 ft movement , I remember looking at the other guys in my class and none of us took our eyes off from that stadium.
On October 28, 1983, a magnitude 6.9 earthquake struck the Lost River Range in central Idaho, USA. The epicenter was located near Borah Peak, approximately 44.08°N latitude and 113.8°W longitude. This earthquake is considered the largest and most significant to affect Idaho.
Impact
Two schoolchildren, 7-year-old Tara Leaton and 6-year-old Travis Franck, were killed instantly when a stone storefront collapsed on them as they walked to school in Challis. RIP
Sean, you forgot the part where the Sun created a solar flare or a coronal mass ejection, which then went into a proton storm. Then the proton storm affects the beaufort_gyre and gets absorbed by the polar caps ...... You can't talk about Earthquakes until you talk about the liquid sun model or DR.Robataille .... or be the laughing stock of geophysics, please, you have time to make a decision and understand that the Sun controls Earthquakes. It never has not
earth quakes last seconds to maybe 2 minutes ,from what i experienced. me 92646. volcanic activity (earthquakes) makes gold come up.
👍👍👍👍👍👍
Thanks!
E