JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-SS Seismology

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

Wed. May 24, 2017 9:00 AM - 10:30 AM IC (International Conference Hall 2F)

convener:Seiji Tsuno(Railway Technical Research Institute), Chairperson:Masumi Yamada(Disaster Prevention Research Institute, Kyoto University), Chairperson:Masayuki Yoshimi(Geological Survey of Japan, AIST)

9:30 AM - 9:45 AM

[SSS15-15] Strong ground motions observed under the 2016 mid Tottori prefecture earthquake, Japan

*Takao Kagawa1, Tatsuya Noguchi1, Shohei Yoshida1, Hiroshi Ueno1, Sho Nakai1, Kazu Yoshimi1, shoya Arimura1, Shinji Yamamoto2 (1.Tottori University Graduate School of Engineering, 2.Tottori University Technical Division)

Keywords:The 2016 mid Tottori prefecture earthquake, Strong Ground Motion, Surface Geology

October 21st., 2016, an earthquake with Mj 6.6 hit mid area of Tottori prefecture, Japan. Earthquake swarms have been activated in the area since mid October in 2015. Large number of seismometers installed by the prefectural government, JMA(Japan Meteorological Agency), NIED(National Institute for Earth Science and Disaster Resilience) and Tottori University, observed strong ground motions in the area. Aftershock observations were also conducted just after the main shock at several temporary sites in the area with housing damages. From prompt analysis of the observed strong motions, it is understood that the ground motions were affected strongly by local site conditions, especially their predominant period caused by sedimentary response. The observed predominant periods at strong motion sites agree well with those estimated by previously conducted microtremor observations in the target area. Characteristics of the observed ground motion and structural damages due to the earthquake are reported considering effect of surface geology in the area.