Source, Propagation Path, and Site Characteristics Separated from Strong Motion Records during the 2016 Kumamoto, Japan, Earthquake Sequence

• SOMEI Kazuhiro

  Geo-Research Institute

• ASANO Kimiyuki

  Disaster Prevention Research Institute, Kyoto University

• IWATA Tomotaka

  Disaster Prevention Research Institute, Kyoto University

• MIYAKOSHI Ken

  Geo-Research Institute

• YOSHIDA Kunikazu

  Geo-Research Institute

• YOSHIMI Masayuki

  Geological Survey of Japan/AIST

Bibliographic Information

Other Title

• 2016年熊本地震系列の強震記録から分離した震源・伝播経路・サイト増幅特性

Abstract

Source, propagation path, and site characteristics were separated from strong motion records during the 2016 Kumamoto earthquake sequence using the spectral inversion technique. We evaluated site amplifications from the seismic bedrock to the ground surface for 177 strong motion stations in and around the Kumamoto prefecture. Site amplifications at stations located inside plains and basins were larger around 1 Hz than those at stations outside plains and basins. From the separated source spectra of 182 events (M_JMA: 3.0-5.5), we calculated stress drops of 91 events which have moment tensor solutions by F-net, and found the depth dependence of them. The estimated 1/Q_S value was modeled as Q_s=73.5f^0.83, which is comparable to those of previous studies in and around the Kumamoto prefecture.

Journal

• Journal of Japan Association for Earthquake Engineering

  Journal of Japan Association for Earthquake Engineering 19 (6), 6_42-6_54, 2019

  JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING

Keywords

• The 2016 Kumamoto earthquake sequence
• Strong motion records
• Spectral inversion

Details

• CRID: 1390564227333424000
• NII Article ID: 130007739805
• DOI: 10.5610/jaee.19.6_42
• ISSN: 18846246
• Web Site: https://www.jstage.jst.go.jp/article/jaee/19/6/19_6_42/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed