Fault parameters of the 1896 Sanriku Tsunami Earthquake estimated from Tsunami Numerical Modeling
作者： Yuichiro Tanioka , Kenji Sataka
DOI: 10.1029/96GL01479
关键词: Epicenter 、 Slow earthquake 、 Accretionary wedge 、 Subduction 、 Seismic wave 、 Seismology 、 Geology 、 Tsunami earthquake 、 Fault (geology) 、 Surface wave magnitude
摘要: The June 15, 1896 Sanriku earthquake generated devastating tsunamis with the maximum run-up of 25 m and caused worst tsunami disaster in history Japan, despite its moderate surface wave magnitude (Ms=7.2) weak seismic intensity. This is a typical earthquake, which generates anomalously larger than expected from waves. Previously proposed mechanisms earthquakes include submarine slumping slow rupture accretionary wedge or subducted sediments. In this paper, we estimate fault parameters by numerically computing comparing waveforms those recorded at three tide gauge stations Japan. result indicates that source very close to Japan trench strike parallel axis. width about 50 km, suggesting sediments beneath wedge.
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