PRELIMINARY RESULTS BASED ON SEISMOLOGICAL AND GEODETIC OBSERVATIONS PUBLISHED BY RESEARCHERS FROM UNIVERSITIES AND LABORATORIES AROUND THE WORLD.
At 14:46 (Local Time) 03/11/2011, an earthquake of 9.0 Mw occurred on the pacific coast from Sanriku to Ibaraki. Below figures show the mechanism by Earthquake Reseach Institute, USGS, Global CMT (left to right). Low-angle reverse fault are achieved in all of them.
The optimal location of the W-phase solution was estimated by grid search method. Probable location ranged in wide area along North-South direction. Parameters of best fit solution are as follows: slope:10，Half duration：70 s，depth 24 km， 38 degrees northern latitude，143 degrees eastern longitude(indicated with red star). Again note that a good waveform-fit was achieved in a wide range at North-South.
COSEISMIC DISPLACEMENT - HORIZONTAL AND VERTICAL displacements based on estimated position of GEONET stations. Coseismic displacement is shown in red, and first 8 hours of postseismic displacement at available stations is shown in blue. Bars at end of vector show 95% error estimate. Solutions courtesy of ARIA team at JPL and Caltech. Preliminary computation shows a horizontal displacement of ~2.4 mts (USGS, Kenneth).
Slip distribution on a curved plate interface using coseismic GPS vectors from the Geospatial Information Authority of Japan. The above plot shows the slip distribution, which extends about 400km N-S and reaches a maximum of about 10 meters. (Ito, Ozawa, Watanabe and Sagiya from Nagoya University)