Characteristics of Near-Fault Ground Motions during the 2016 Kumamoto, Japan, Mainshock

Tomotaka Iwata; Kimiyuki Asano

Presentation information

[EJ] Oral

S (Solid Earth Sciences) » S-CG Complex & General

[S-CG70] [EJ] Analysis and Prediction of Near-Source Strong Ground Motions: Present Status and Future Perspective

Wed. May 24, 2017 3:30 PM - 5:00 PM A07 (Tokyo Bay Makuhari Hall)

convener:Kimiyuki Asano(Disaster Prevention Research Institute, Kyoto University), Takao Kagawa(Tottori University Graduate School of Engineering), Hongjun Si(Seismological Research Institute Inc.), Haruo Horikawa(Institute of Earthquake and Volcano Geology, National Institute for Advanced Science and Technology), Chairperson:Takao Kagawa(Tottori University Graduate School of Engineering), Chairperson:Haruo Horikawa(Institute of Earthquake and Volcano Geology, National Institute for Advanced Science and Technology, Institute of Earthquake and Volcano Geology, National Institute for Advanced Science and Technology)

4:00 PM - 4:15 PM

[SCG70-09] Characteristics of Near-Fault Ground Motions during the 2016 Kumamoto, Japan, Mainshock

*Tomotaka Iwata¹, Kimiyuki Asano¹ (1.Disaster Prevention Research Institute, Kyoto University)

Keywords:Near-source ground motions, The 2016 Kumamoto earthquake

During the mainshock of the 2016 Kumamoto earthquake, which caused the surface rupture, strong motions (JMA seismic intensity of 7) at Mashiki town and Nishihara village were observed near the surface rupture. We carefully integrated the observed acceleration records to velocities and displacements with correcting the base-line change in acceleration records, which would be caused by the effect of tilting of the seismometer. The corrected observations show large permanent displacements, which include near-fault terms. The amounts of permanent displacements coincide to geodetic observation results. We discuss those ground motion characteristics and compare those with other near-fault ground motion records.