Hyper Dense Seismic Observation for Investigation on Fault Zone Development: Application to Hypocentral Area of 2000 Western Tottori Earthquake

Satoshi MATSUMOTO, Yoshihisa IIO, Shinichi SAKAI, Aitaro KATO, Group for "0.1 Manten" Hyper Dense Seismic Observation
2020 Journal of Geography (Chigaku Zasshi)  
One important factor controlling crustal strength is fault zone development. A fault can mature through multiple stages where small faults are generated by rupturing homogeneous media, and are partially connected each other, with large deformations locally concentrated along a major fault. Fault geometry, stress field, and seismic activity, which are detectable with seismic observations, may depend on the stage of fault evolution. At the same time, fault distribution and slip properties
more » ... properties observed in a geological survey also provide important information on constraints to fault development. In particular, comparing fault distribution and direction between seismological analyses and geological observations plays an important role in understanding the history of fault zone evolution. A bottleneck in the seismological approach to investigating fault zone development is low spatial resolution due to low spatial density and number of seismic stations. A key element for understanding fault zone development in the crust based on seismic observations is discussed. "0.1 manten" hyper dense seismic observations carried out * 九州大学大学院理学研究院 ** 京都大学防災研究所 *** 東京大学地震研究所 **** 九州大学大学院理学研究院・理学府:松本 聡,松島 健,志藤あずさ,千葉慶太,手操佳子(現:気象庁) ,神薗めぐ み,光岡郁穂,村松 弾,岩佐優一,武石貢佑(現:気象庁) ,林田祐人,湯浅雄平;京都大学防災研究所:飯尾能久, 冨坂和秀,米田 格,澤田麻沙代,長岡愛理,波岸彩子,中川 潤,三浦 勉,津田寛大,加藤慎也,伊藤喜宏;東京 大学地震研究所:酒井慎一,加藤愛太郎,岩崎貴哉,池澤賢志,大塚宏徳,佐伯綾香,諏訪祥士(現:気象庁) ,芹澤正 人,西本太郎,藤田親亮,増田正孝,森 健彦(現:気象庁) ;関西大学社会安全学部:林 能成;高知大学高知地震観 測所:大久保慎人・山品匡史;鳥取大学工学研究科:香川敬生・野口竜也;島根大学総合理工学部:向吉秀樹・内田嗣人・ 大久雅貴・奥田悠大・高松洋太・長畑友貴・橋本 匡・松原 透
doi:10.5026/jgeography.129.511 fatcat:hhcc4tmbwrh5tc5qbox46d4slu