[S-SS25] Strong Ground Motion and Earthquake Disaster

[SSS25-P10] Microtremor surveys for S-wave velocity structure in Okinawa and Amami islands, Japan

*Nobuyuki YAMADA¹, Hiroshi TAKENAKA² (1.Fukuoka University of Education, 2.Okayama University)

Keywords:Okinawa, Yoron, Okinoerabu and Tokunoshima island, S-wave velocity structure, Microtremor array measurement

We conducted microtremor array measurements at six sites in four islands of the Nansei islands area: Northern part of Okinawa main island, Yoron island, Okinoerabu island and Tokunoshima island, to estimate the vertical (1D) S-wave velocity profiles of deep sedimentary layers over the basement with a Vs about 3.0 - 3.5 km/s. In this presentation, we will report the result of the analysis and the obtained S-wave velocity profiles at the six sites. These 1D velocity profiles may be available for making a 3D structure velocity model over the Nansei islands area for the strong ground motion simulations.
This work was supported by JSPS Grant-in-Aid for Scientific Research (B), Number: 26282105.