Japan Geoscience Union Meeting 2016

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Poster

Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS28] Seismic wave propagation: Theory and Application

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Kiwamu Nishida(Earthquake Research Institute, University of Tokyo), Hisashi Nakahara(Solid Earth Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Jun Matsushima(School of Engineering, The University of Tokyo), Tatsuhiko Saito(National Research Institute for Earth Science and Disaster Prevention)

5:15 PM - 6:30 PM

[SSS28-P16] The feature of waveform in Japan of two deep earthquakes which occurred beneath Peru on November 24, 2015

*Shutaro Sekine1, Kenshiro Tsumura1 (1.Associatinon for the Development of Earthquake Prediction (ADEP))

Keywords:shadow zone, deep earthquake

Two deep earthquakes occurred successively on November 24, 2015 in Brazil. According to USGS, magnitude of these earthquakes are Mw 7.6, and focal mechanism of these earthquakes is the normal fault type. These two deep earthquakes were observed at whole part of Japan, but in trace, the amplitude ratio of the two earthquake are not constant.
From the two earthquakes, the Japanese observation seismic networks locate between 135 and 150 degree. Then half of the stations are in the shadow zone, the others are out of the shadow zone. The borderline of the shadow zone is crossing at the Chubu district, and maximum amplitude is caused PKP or PKIKP. Because two hypocenters are 0.5 degrees distant, amplitude ratio is varied.