[S-SS16] [JJ] Crustal Structure

[SSS16-06] Seismic structure beneath Ryukyu arc, Japan, inferred from S-wavevector receiver functions

*Takumi Murakoshi¹, Hiroshi Takenaka², Masanao Komatsu², Nobuyuki Yamada³ (1.National Defense Academy, 2.Okayama University, 3.University of Teacher Education Fukuoka)

Keywords:reciever function, Ryukyu arc, crustal structure

This study describes the seismic images of the crust and uppermost mantle beneath the Ryukyu arc, Japan by using S-wavevector receiver function (SWV-RF) analysis at virtual subsurface receivers. The SWV-RF has a great advantage that the problem of unclearly seismic images beneath very thick sedimentary basin due to the records include strong effect of reverberation within the sedimentary layer can be overcome (Takenaka and Murakoshi, 2010, AGU). In this study, we applied the SWV-RFs from broadband seismic records of the F-net (NIED) and ETOS (JMA) to obtain the seismic images of Moho and subducted Philippine Sea plate beneath the Ryukyu arc, Japan. In this presentation, we will show the estimated seismic structure beneath the Ryukyu arc, which is derived from the depth-converted SWV-RFs.

Acknowledgement: We have used F-net data (NIED), ETOS data (JMA) and deep subsurface structure model by J-SHIS (NIED).