I'm retired from studying earthquakes for a large company. I use this blog as my grouchy soapbox, and I recommend it for everybody.
Friday, March 11, 2011
Shakemap for Japan
Here is the automatic Shakemap for this earthquake. Note that we get a first glance at the rupture area, which seems to me a little short for an 8.9. I'm sure it's at least 1000 km and zooms off to the north more. As we can see, a classic subduction earthquake does not pump out a high PGV. From the videos, the shaking appeared mild, and would have just hit the swamps. This is farther out than Chile, so maybe it's just 40 cm/s on average ground. I don't think they build soft-story condos there!