Science News spoke with U.S. Geological Survey seismologist SeismoSue about the recent earthquake in Turkey.
, as much as magnitude 9 . But quakes close to magnitude 8 are not common on strike-slip faults. But because they’re on land and tend to be shallow, you can get severe … shaking close to the fault that’s moving.: As with a lot of things, there’s what’s expected on average, and there’s what’s possible. On average, the largest aftershocks are a full unit smaller than the main shock. But that’s just average; for any individual main shock, the largest aftershock can have a lot of variability.
The other thing people noted was the distance [between the main shock and some aftershocks over a hundred kilometers away]. Aftershock as a term isn’t precise. What is an aftershock isn’t something that seismologists are always clear on. The fault that produced the main shock is 200 kilometers long, and that’s going to change the stress in a lot of areas. Mostly it releases stress, but it does increase stress in some areas.
An interesting [and completely separate] idea is that you might get earthquakes around the perimeter of the Great Lakes [such as near Buffalo] because as the lake levels go up and down, you’re stressing the Earth’s crust, putting weight on one side or the other. That’s a source of stress that could give you these pretty small quakes.: It’s hard to watch. And it hammers home the importance of building codes.
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