Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-SS Seismology

[S-SS14] Strong Ground Motion and Earthquake Disaster

Tue. May 22, 2018 9:00 AM - 10:30 AM A10 (Tokyo Bay Makuhari Hall)

convener:Masayuki Kuriyama(Central Research Institute of Electric Power Industry), Chairperson:Uetake Tomiichi, Nakai Kentaro(名古屋大学大学院工学研究科)

9:15 AM - 9:30 AM

[SSS14-24] Distribution of the quake in metropolitan area by MESO-net

*Shin'ichi Sakai1, Shin Aoi2, Takeshi Kimura2, Tomotake Ueno2, Naoshi Hirata1 (1.Earthquake Research Institute, University of Tokyo, 2.National Research Institute for Earth Science and Disaster Resilience)

Keywords:MeSO-net, heterogeneity of quake, recognition and estimation of a high-density quake

MeSO-net is a seismic observation point which consists of three accelerometers installed in perforated bottom of depth 20m. It consists of 301 points and they are observed continuously. On March 11, 2011, 249 points are established, and every observation record was obtained. An observation point interval in Tokyo which are the center of the metropolitan area is 2-3km. The quake should not have large difference because it's more than 100 km away from the epicenter, but the difference which can't be explained was judged by the attenuation effect of the distance. It will be caused by the difference between the topography and the soil structure, but There are a lot of unclear points about the reason yet. When the distribution of quake by large earthquake is presumed, it's necessary to consider this heterogeneity of quakes. Waveforms recorded by MeSO-net ware considered in detail. They ware contrasted with the topography and foundation. In more dense observation, we have developed a method of recognition and estimation of a high-density quake.