Harold Asmis @hasmis@qoto.org

#physics #earthquake **acceleration** At about .6g. I consider this to be not as important as the pgv. Earthquake design uses accel which is long and wobbly, thus they design for resonance. The velocity is a big nasty pulse, and more accurately relates to the base shear.

#physics #earthquake **Turkey strong ground motion** I'm having a tough time figuring this out, but this is PGV in the basin that dropped. A pulse of 120 cm/s is about as strong as you can get and no structure can stand against it.

#earthquake **Buffalo earthquake** Very tiny. It reflects a major fault under Hamilton. It is activated by a seep of lake water.

#physics #earthquake **Aftershocks** These aftershocks define the fault zone. There was only one big quake, and the second was an M6. You need more strong ground motion sensors to define the mechanics.

#physics #earthquake **The two nearly identical earthquakes looks to have a mechanism of first, one side dropping, and then the other.

#physics #earthquake **Expanding basin** The whole place is a hot zone for earthquakes.

#earthquake **Turkey Tectonics** At the epicentre, we have extension as the Arabian plate pushes in.

#earthquake **Extension earthquake in Turkey** You can see very complex tectonics here. This was a shallow extension (basin) earthquake that would have sent out a wide swathe of lower frequency ground motion.

#earthquake #physics **Water-activated earthquakes** The earthquakes in Texas, and formerly Oklahoma were acknowledged, even by the powers, to be activated by water injection. If all those lined-up storms dump on California, the hypothesis is that there will be a noticeable increase in earthquakes. The odds of a big one remain the same as always. (just said to cover my sensitive parts). :)

#earthquake Felt earthquake in Texas due to water injection. They are constantly getting bigger.

Texas earthquake
#earthquake
Just an extension earthquake, but they continue to get bigger and bigger.

Montreal earthquake
#earthquake
https://www.cbc.ca/news/canada/montreal/earthquake-hits-montreal-area-saint-jerome-1.6651785
Earthquakes are my main love, but nothing has really happened over the last 20 years. I'm more interested in mechanisms and effects on structures. This was a common earthquake for the area.