JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

S (Solid Earth Sciences) » S-SS Seismology

[S-SS15] [JJ] Strong Ground Motion and Earthquake Disaster

Wed. May 24, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Seiji Tsuno(Railway Technical Research Institute)

[SSS15-P20] Modeling of 3D S-wave velocity structure for sedimentary layers in Kanto area, using microtremor array surveys –part 2-

*Kaoru Jin1, Shigeki Senna1, Atsushi Wakai1, Hiroyuki Fujiwara1 (1.National Research Institude for Earth Science and Disarster Prevention)

Keywords:microtremor array observation, S-wave velocity structure, Underground structure model

We have ever engaged in modeling of underground structure from seismic bedrock to ground surface in Kanto area for the purpose of improving accuracy of earthquake ground-motion prediction. In order to advance the underground structure models, microtremor surveys have been conducted at a lot of sites in Kanto plain for these several years. “Senna, 2016” shows that the conventional underground structure models were improved by using records of microtremor array surveys conducted by 2015 and earthquake observations.

In this study, by adding results of microtremor array surveys conducted at about 100 sites in 2016, the underground structure models were improved at the target area in comparison with models constructed in 2015. Above all, velocity layers from Vs500 m/s to Vs900 m/s were modified.