Elucidation of Strong Motion Generation Mechanism Controlled by Hierarchical Structure in Source Heterogeneity of Subduction Plate-Boundary Earthquakes

• Project/Area Number: 25750146
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Kyoto University
• Principal Investigator: ASANO Kimiyuki 京都大学, 防災研究所, 准教授 (80452324)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
• Keywords: 強震動 / 地震 / 震源過程 / 海溝型地震 / 震源モデル / 海溝型巨大地震 / 巨大海溝型地震 / 2011年東北地方太平洋沖地震

Outline of Final Research Achievements

This study focused on hierarchical structure in source heterogeneity of earthquake source to elucidate the mechanism of strong motion generation controlled by spatial heterogeneity of source rupture process during subduction plate-boundary earthquakes. Most of achievements were based on development and improvement of kinematic source inversion techniques and analyses of strong motion records from observed earthquakes. An extended characterized source model for the 2011 Tohoku earthquake was proposed for simulating ground motion in a broadband period range (0.1-50 s). The variation in source parameters of strong motion generation area was studied for four repeating M6-class earthquakes off Kesennuma. The difference of source characteristics between the Nankai Trough and the Japan Trench was found. The source inversion techniques were improved and some new techniques were developed including frequency dependencies. The parallel FDM code for 3D seismic wave propagation was improved.

Research Products

• [Journal Article] Source Modeling of an Mw 5.9 Earthquake in the Nankai Trough, Southwest Japan, Using Offshore and Onshore Strong‐Motion Waveform Records (2018)
  • Author(s): Asano Kimiyuki
  • Journal Title: Bulletin of the Seismological Society of America Volume: 108 Issue: 3A Pages: 1231-1239
  • DOI: 10.1785/0120170357
  • NAID: 120006826649
  • Peer Reviewed
• [Journal Article] Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions (2017)
  • Author(s): Kimiyuki Asano, Tomotaka Iwata, Haruko Sekiguchi, Kazuhiro Somei, Ken Miyakoshi, Shin Aoi and Takashi Kunugi
  • Journal Title: Earth, Planets and Space Volume: 69 Issue: 1 Pages: 108-108
  • DOI: 10.1186/s40623-017-0694-3
  • NAID: 120006335640
  • Peer Reviewed / Open Access
• [Journal Article] Modelling of wave propagation and attenuation in the Osaka sedimentary basin, western Japan, during the 2013 Awaji Island earthquake (2016)
  • Author(s): Asano, K., H. Sekiguchi, T. Iwata, M. Yoshimi, T. Hayashida, H. Saomoto, and H. Horikawa
  • Journal Title: Geophysical Journal International Volume: 204 Issue: 3 Pages: 1678-1694
  • DOI: 10.1093/gji/ggv543
  • NAID: 120006318896
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Development of fully Bayesian multiple-time-window source inversion (2016)
  • Author(s): Kubo, H., K. Asano, T. Iwata, and S. Aoi
  • Journal Title: Geophysical Journal International Volume: 204 Issue: 3 Pages: 1601-1619
  • DOI: 10.1093/gji/ggv540
  • NAID: 120006318897
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] An Overview of Source Models from Strong Motion Records of the 2011 Tohoku Earthquake (2016)
  • Author(s): 三宅弘恵、浅野公之、纐纈一起、岩田知孝
  • Journal Title: Journal of Japan Association for Earthquake Engineering Volume: 16 Issue: 4 Pages: 4_12-4_21
  • DOI: 10.5610/jaee.16.4_12
  • NAID: 130005142683
  • ISSN: 1884-6246
  • Peer Reviewed / Open Access
• [Presentation] Analyzing Strong Motion Generation Area of the MJMA 6.5 Earthquake Occurring Offshore the Kii Peninsula on April 1, 2016 (2017)
  • Author(s): Asano, K.
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Ground motion simulation during the 2016 Kumamoto earthquake mainshock in near-fault area and Aso caldera (2017)
  • Author(s): Asano, K. and T. Iwata
  • Organizer: IAG-IASPEI 2017 Joint Assembly
  • Int'l Joint Research
• [Presentation] Source Model of the MJMA 6.5 Plate-Boundary Earthquake at the Nankai Trough, Southwest Japan, on April 1, 2016, Based on Strong Motion Waveform Modeling (2017)
  • Author(s): Asano, K.
  • Organizer: American Geophysical Union 2017 Fall Meeting
  • Int'l Joint Research
• [Presentation] Source Rupture Process and Near-Fault Ground Motions of the 2016 Kumamoto Earthquake Sequence Estimated from Strong Motion Data (2016)
  • Author(s): Asano, K. and Iwata, T.
  • Organizer: アメリカ地球物理学連合2016年大会
  • Place of Presentation: サンフランシスコ（アメリカ合衆国）
  • Year and Date: 2016-12-16
  • Int'l Joint Research
• [Presentation] 2016年熊本地震本震の震源過程と震源近傍地震動 (2016)
  • Author(s): 浅野公之、岩田知孝
  • Organizer: 日本地震学会2016年秋季大会
  • Place of Presentation: 名古屋国際会議場（愛知県・名古屋市）
  • Year and Date: 2016-10-06
• [Presentation] 海溝型繰り返し地震の震源特性のばらつきの評価に向けて～気仙沼沖の繰り返し地震を例に～ (2016)
  • Author(s): 浅野公之
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ国際会議場（千葉県・千葉市）
  • Year and Date: 2016-05-24
• [Presentation] Complementary Ruptures of Surface Ruptures and Deep Asperity during the 2014 Northern Nagano, Japan, Earthquake (MW 6.3) (2015)
  • Author(s): Asano, K., T. Iwata, and H. Kubo
  • Organizer: American Geophysical Union 2015 Fall Meeting
  • Place of Presentation: サンフランシスコ（アメリカ合衆国）
  • Year and Date: 2015-12-18
  • Int'l Joint Research
• [Presentation] 観測点間グリーン関数情報を用いた西南日本地殻速度構造モデルの改良 (2015)
  • Author(s): 浅野公之、岩田知孝
  • Organizer: 日本地震学会2015年秋季大会
  • Place of Presentation: 神戸国際会議場（兵庫県神戸市）
  • Year and Date: 2015-10-27
• [Presentation] Improvement of crustal velocity structure model for ground motion prediction in southwest Japan based on modelling inter-station Green’s functions among F-net broadband stations (2015)
  • Author(s): Asano, K. and T. Iwata
  • Organizer: French-Japanese Symposium on Earthquakes and Triggered Hazards
  • Place of Presentation: オルレアン（フランス共和国）
  • Year and Date: 2015-09-17
  • Int'l Joint Research
• [Presentation] 強震波形から推定した2014年長野県北部地震の震源過程 (2015)
  • Author(s): 浅野公之、岩田知孝、久保久彦
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ国際会議場（千葉県千葉市）
  • Year and Date: 2015-05-25
• [Presentation] Extension of Characterized Source Model for Broadband Strong Ground Motion Simulations (0.1-50s) of M9 Earthquake (2014)
  • Author(s): Asano, K. and T. Iwata
  • Organizer: American Geophysical Union 2014 Fall Meeting
  • Place of Presentation: アメリカ合衆国・サンフランシスコ・モスコーンセンター
  • Year and Date: 2014-12-17
• [Presentation] Research on the mechanism of strong motion generation from huge subduction earthquake toward the advanced strong motion prediction (2014)
  • Author(s): Asano, K.
  • Organizer: International Workshop on New Initiative toward the Advancement of Strong Motion, Site Effect, and Risk Evaluation Studies for Future Mega-Quakes
  • Place of Presentation: 京都大学宇治おうばくプラザ
• [Presentation] Observation and simulation of interstation Green's functions obtained from continuous microtremor observation in the Osaka basin (2013)
  • Author(s): Asano, K., T. Iwata, H. Sekiguchi, K. Somei, K. Miyakoshi, S. Aoi, and T. Kunugi
  • Organizer: IAHS-IASPO-IASPEI 2013 Joint Assembly
  • Place of Presentation: スウェーデン王国・ヨーテボリ・スウェーデン会議場