Mapping of seismic reflectors in and around of Ota earthquake fault, Akita, Japan

概要

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A seismic survey was carried out in 1999 around Ota fault on the eastern margin of Yokote-basin, Akita Prefecture, Japan. There are two kinds of seismic spread: one is straight line (A line) and the other is L-shaped array (B line). Clear reflections are obtained in many shot records. Then, we applied the mirror image method to travel time data of these reflection. Optimum image point is defined at minimize RMS residual of travel time between the observed and the estimated by grid search. Grid size is 10m. N-S and E-W profiles were obtained by this method for the line B. In N-S profile, there are some reflectors dipping from the surface rupture of Ota earthquake fault. In N-S profile, additionary, this result shows the south dipping reflectors. Our results correlated with the CMP profile of the line A.
Japanese Society for Active Fault Studiesの論文