CWU's Nick Zentner from his home in Ellensburg, Washington on Saturday, April 4, 2020 during the global coronavirus pandemic. 0:00 Livestream Starts. 14:08 Lecture Begins.
Still getting caught up 😄 Prof, ALL your material just puts a smile on my face and wakes up my curiosity-THANK YOU! And thanks to all the live viewers for such good questions 👍🏼
Great for changing time, so we in europe can watch you live. Really appreciate it. Been watching all your videos, you are best hands on teacher ever! Thank you Nick, you are a gem, more precious than first mineral in the universe.
I live about 100 miles south of the 6.5 quake that just struck Idaho. Was sitting in my easy chair. Kind of like a carnival ride, and strangely pleasant yet eerie at the same time. The power is unfathomable.
I love watching your shows. Ive lived on WA nearly all my life and your still teaching me stuff. Been watching for a couple years now. All the way back with the short films on RU-vid. Keep them coming. Ill keep watching. Great job.
.....good health to you, and you'res, I love you too Nick! You are awesome teacher/blessing/pioneer! tyvm for your work! So valuable! Best show around pal!
When the next earthquake (after the 65 one) happened, I was sitting in my first floor apartment, and all of a sudden, I heard a HUGE bang, and I thought that maybe the guy upstairs had thrown over his refrigerator. Things started shaking, and I went to go outside, but there were two glass partitions by the entrance, so I ran back into my apartment and held on for dear life. I could feel the floor move, I could feel the apartment swaying from side to side, and I could see my car lurching forward and backward which was amazing. I was living in Issaquah which sits at the end of Lake Sammamish, so basically we were in a bit of a liquifaction area. I had wondered what the big bang was, and later on, I learned that the big bang was the sound of the sonic wave when it broke the surface of the earth. Very interesting!!
The Alaska quake of 1964 was a 9.2. From info I've read the shaking lasted 4 minutes+. Aunt and her family lived through it when they were in Anchorage: the same one who later settled with her family in Pocatello and was an exec sec in admin at ISU while u were studying there Nick. My personal biggies were: Hebgen Quake Aug 1959 (7.5) and Loma Prieta Oct 1989 (6.9). I've lost count of the # of what I call "baby quakes" I've felt since I've lived in Silicon Valley area since 1966. Not just San Andreas, but some Hayward fault, some Calavers Fault, some Diablo-Greenville (series in the 5.0-5.5 range in the mid 70s freaked out the NY born boss we had at the time, while we held magnitude-guessing pools LOL).
As far as "orphan tsunami" traveling across the Pacific, I remember 10 years ago we had a thankfully small tsunami hit my island, Kyushu, Japan, from the 8+ earthquake that struck in Chile. No damage here, but the harbor was evacuated for safety, and there was a noticeable, though very small surge. That tsunami traveled about 11,000 miles to reach us here.
There are Tsunami warning buoys stationed off our coast and trigger the warning horns. We also have Lahar warning horns in Puyallup, Fife, and Orting throughout the Puyallup river valley basin.
To calculate the size difference between a 7.0 mag and a 4.8 mag we’d take the difference in magnitude - 2.2 - and raise 10 to that power: 10^2.2 = 158.49. But to calculate the energy or power, they take the difference in magnitude, multiply it by 1.5, then raise 10 to that power: 10^(1.5*2.2) = 1995.26. That's the extra energy released. So between a mag 5 and a mag 8 , that's a 31,622 energy difference. I can't remember where they get the 1.5 now, probably from Richter.
Good news. I think they've found a low-velocity layer (LVL) offshore that acts as a buffer zone for Cascadia. [ See Pascal Audet and Andrew J. Schaeffer, 2018. That's one paper on it; I was very into seismology once. There may be a more relevant paper,; but I didn't keep notes ]
I would think that there would not be too much correlation between a full rip quake and a volcano erupting. The pressure in the volcanic system would have to be built up to near eruption levels in order to be triggered by the quake and would be likely to erupt any way without the quake.
Just wonder if the focus could be sharper if there weren't as much of the yard and especially the fence. Pretty good depth of field, so not a huge problem. But if the house were the background, it wouldn't force the focus to such a distance.
Dammit! I missed it. Had some important question. Maybe you could help me . What is the highest magnitude that could ever happened? I could have easily Googled it, but I'd rather communicate with the outside world. Hello from Houston.
The highest magnitude that has ever been recorded was the 1960 Great Chilean Earthquake, which hit a whopping 9.5 on the Richter Scale. It caused tsunamis as far away as Alaska and Japan, with waves of 35 feet recorded that far away. The average slip along the relevant faults was 11m along hundreds of miles of faultline. It caused a volcano to erupt (not the other way around). Probably not a great time machine destination. As for the largest possible... well, there is technically no ceiling to earthquake activity. Take all the matter in the universe that isnt Earth and form it into a ball aimed at Earth as close to the speed of light as possible. Call Randall Munroe. The resulting impact is basically the ceiling for earthquake intensity.
I have a whole collection of small globes at work - glass, wood, papier mache, etc. I also collect jewelry of geographic features (mountains, rivers, etc.) and places (Washington state, globes, etc.).
Is it possible that the submarine events, or at least a portion of them, were caused ( at certain intervals) by the increasing gradiant of the NA Plate during the 500yrs of compression and lift. As well as one every 500yrs approx during the " uocking" event
There is a possible connection between the 1700 earthquake and the Tseax eruption that occurred between 1668 and 1714 (magnetic dating of magma). Oral history talks about the ground shaking before the eruption. It was a small eruption but it did kill thousands of people.
@@Ellensburg44 no there isn't. Tseax Cone is nothing to do with the Cascades and it is too far north to be affected by the 1700 earthquake. It is part of the Northern Cordilleran Volcanic Province, which just like the Basin and Range has formed due to crustal extension. There is no subduction zone off that coast at all. As for the oral history, it's entirely possible they felt harmonic tremor or other volcanic or volcano-tectonic tremor in the build up to the eruption, but it's absolutely nothing to do with the 1700 earthquake. The actual nearest and best evidence for such a direct triggering of a volcanic eruption was to do with the 9.5 in Chile in 1960. That occurred on 22nd May 1960 and two days later Puyehue-Cordón Caulle volcano erupted. Even so that's only a sample of one and so could easily be a coincidence.
I seriously don't understand how tree ring analysis could date anything. Trees only produce rings when alive. Counting the rings could tell someone how old the tree was when it died, but not how long ago it died. I could understand carbon dating the dead trees.
