AGU Blogosphere | Mountain Beltway | Japan M8.9 quake + tsunami: "So, for the record: The focal mechanism is a classic “center segment compression” which suggests reverse faulting, which is what we would expect at a subduction zone most of the time.
The map of historical seismicity in the area shows that today’s quake took place in an area where there have historically been many other shallow (<35 km) foci, but also deeper quakes (between 35 and 70 km depth), and some that are even deeper than that:"
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