Magnitude 9: The Largest Earthquakes on Earth Happen in BC

Nick Zentner is the best lecturer on geological history and structures I've ever heard. I do not live in Washington, but have watched all his YT lectures. He is a treasure.

A friend of mine live through the 1964 Alaskan earthquake. He saw Sitka Spruce, over 100 feet tall, slap the ground as waves of earth caused the trees to hit one side then swing up to the opposite side.

Yes, Terry Moore, Alaska 1964 was 9.2 and shook for over 7 minutes. My husbands mother was pregnant with him when the earthquake struck. She was standing out front of her beauty shop and just before it hit, a man walking by pushed her into a snowdrift. Immediately after that the road dropped 30 feet and the guy disappeared. Not to mention what happened to the rest of the city after that.

My memory of the history of the concept of mid-ocean spreading as evidenced by magnetic "striping" was that it was discovered as part of the International Geophysical Year in the late 1950's.

I have been wondering for many years about the mass transfer of ice to sea water and how significant this impacts plate tectonics. So glad the question was posed in such a forum. Someone please start the research as I am only curious and not a geologist myself

I would like to se a series of plate tectonics and terranes like Nick Zentner does, but in Canadian PNW

I was in Olympia in a dentist office. Everyone was freaked out afterwards and worried about their kids in school. I tried to calm them down and tell them it was not that bad and that their kids were ok. When you are in a 9.2 quake anything below 7 seems mild. I felt like I was surfing the earth during the Alaska earthquake and still remember how powerful the earth was as it moved.

Latest announcement was that the earthquakes happen between 290 and 500 years but more closer to 300 so we are back to being due, not over due but close.

I distinctly remember when during the Northridge Earthquake, several people gave accounts, in seperate interviews, of the way that big pieces of bedroom furniture were lofted into the air. I remember questioning this and looking further and finding other concurring accounts. Incidentally, during my search I found a number of people who said that ceiling beams broke free and fell on their sturdy wooden "four poster" beds and each person insisted that they are sure that this saved their life as they were asleep in bed at the time, which I believe was at about 5am, if I remember correctly.

I remember the TV coverage of the big Anchorage shake in the 60’s. The liquification and subsequent evacuation of a layer of sand into the ocean through the eroded side, thus resulting in a large (meter or so) underground gap that caused ground collapse, really impressed me. Was wondering if that was accurately reported.

The largest earthquake 9.5 on recorded history was in Valdivia, Chile 1960 9.5M

just to note m son was in the Portland State Library during the 2001 eq and he said the shelves almost fell over. I was in North Plains Ore and in house it felt like everything was going in a circle. In a spot outside on the driveway no felt motion but the trees across the street were whipping back and forth. So the graph is off a bit. Great talk,we don't get a lot of Canadian info here.

Great presentation....audience should be given a mic to ask questions if this is supposed to be fully useful to those watching at home. Long questions definitely have to relayed by the host.

Re oil tanks. I can say that in logging camps all tanks are required to have a berm with "storage" volume of at least twice the full volume of the tanks. "Funny" thing is that the pipes for filling and pumping from the tanks must go OVER the berm, not through it. That stops syphoning the fuel out with tank collapse. I see no reason why, if isolated camps require that, tanks anywhere in BC would not have the same requirements.

I was just a kid when the Alaska earthquake happened, but already interested in geology. I remember there was no reporting of volcanic activity associated with it. But the videos and photos in Life magazine were just astounding!

I was in the Olympia 2001 earthquake and cars were disappearing like small boats in the ocean, quite the experience

Scary to see along the ring of fire how active its been lately..Except B.C's coast!...Where is all the energy going, is it stored to burst any time soon??And Vancouver keeps building high HIGH buildings everywhere...

Excellent and clear presentation. Much NEW information has developed since 2014, but Mr. Clague does and very concise job explaining the historical development of these concepts.

I was in Christchurch the day of the quake. Was evacuated the next day with only the clothes i was wearing. Couldn't get into my hotel to retrieve anything due to danger of further collapse. Biggest problem throughout the city was the liquifaction...it is built on an alluvial floodplain.

I heard of a study that showed saline consistency changes prior to a subduction zone eq. Any update on that?