Similar(60)
Unfortunately, about 60 hours of data were unavailable for this event and we could not detect any fore shocks, even if there might have been some.
The size of the fore-shock area is ~50 km × ~50 km.
Open red circles denote seismicity in the current fore-shock-mainshock sequence.
The fore-shock area spread around the epicenter of the M 9 main-shock.
The peak of the slip is found around (142.0, 38.6), closer to the coast than the peak of the slip for the fore-shock.
Foreshocks in the two days preceding the mainshock occurred in a localized area off Miyagi, and the Mw 9.0 mainshock occurred at the southwestern edge of this fore-shock area.
The aftershock activity in this region extended westward to the region of cluster C immediately after the mainshock, but, at present, there is a gap between clusters B and C. The CMT solutions of the aftershocks are similar to those of the fore-shock and mainshock (Ito et al., 2005).
This can be explained by the fact that the ETAS model basically forecasts with its background rate, which is of course lower than the average rate of the fitted Poisson model, for the day of the mainshock together with a burst of many aftershocks and gives lower probabilities of earthquake occurrences if there is no fore-shock has occurred nearby in the recent past.
The hypocenters of the 2003 and 2005 events and the fore-shocks of the 2011 Tohoku earthquakes are taken from the JMA unified earthquake catalog.
To eliminate tradeoffs between our estimates of the fore-shock's coseismic displacement, postseismic displacement following the foreshock, and reference frame errors, we estimated corrections to the reference frame first and then fixed them a priori for the final NSF run.
The red dotted rectangle very roughly encloses the fore-shock focal area.
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