A wide variety of slow fault-slip phenomena, called slow earthquakes, occur in subduction zones worldwide. These slow earthquakes sometimes trigger great earthquakes and earthquake swarms. I am working to improve probabilistic forecasts of seismicity by considering the effect of slow earthquakes on triggering seismicity. In addition, I am interested in the diversity of fast and slow seismicity in subduction zones worldwide and their origins.
Research Interests
統計地震学
Subduction zone
スロー地震
地震活動の物理
Research Areas
Natural sciences, Solid earth science, 地震学
Papers
日本海溝沿いのスロー地震分布とそれに関する地殻構造論的・地質学的考察
西川 友章
月刊地球, 2022, Invited
A cold seep triggered by a hot ridge subduction
Lucía Villar-Muñoz; Masataka Kinoshita; Joaquim P. Bento; Ivan Vargas-Cordero; Eduardo Contreras-Reyes; Umberta Tinivella; Michela Giustiniani; Natsue Abe; Ryo Anma; Yuji Orihashi; Hikaru Iwamori; Tomoaki Nishikawa; Eugenio Andres Veloso; Satoru Haraguchi
Scientific Reports, Oct. 2021
Earthquake Swarm Detection Along the Hikurangi Trench, New Zealand: Insights Into the Relationship Between Seismicity and Slow Slip Events
Tomoaki Nishikawa; Takuya Nishimura; Yutaro Okada
Journal of Geophysical Research: Solid Earth, Apr. 2021
スロー地震多発領域が東北地震の破壊を止めた
西川 友章
地震ジャーナル, Dec. 2020, Invited
Relationship of preseismic, coseismic, and postseismic fault ruptures of two large interplate aftershocks of the 2011 Tohoku earthquake with slow-earthquake activity
Hisahiko Kubo; Tomoaki Nishikawa
Scientific Reports, Dec. 2020
The slow earthquake spectrum in the Japan Trench illuminated by the S-net seafloor observatories
T. Nishikawa; T. Matsuzawa; K. Ohta; N. Uchida; T. Nishimura; S. Ide
Science, 23 Aug. 2019
Recurring Slow Slip Events and Earthquake Nucleation in the Source Region of the M 7 Ibaraki-Oki Earthquakes Revealed by Earthquake Swarm and Foreshock Activity
Tomoaki Nishikawa; Satoshi Ide
Journal of Geophysical Research: Solid Earth, Sep. 2018
Detection of earthquake swarms at subduction zones globally: Insights into tectonic controls on swarm activity
T. Nishikawa; S. Ide
Journal of Geophysical Research: Solid Earth, Jul. 2017
Background seismicity rate at subduction zones linked to slab‐bending‐related hydration
Tomoaki Nishikawa; Satoshi Ide
Geophysical Research Letters, 16 Sep. 2015
Earthquake size distribution in subduction zones linked to slab buoyancy
Tomoaki Nishikawa; Satoshi Ide
Nature Geoscience, Dec. 2014
Misc.
スロー地震ってなんだ?
西川 友章
Japanese Scientists in Science 2019, Mar. 2020, Invited
S-netが明らかにした東北沖のスロー地震分布
西川 友章
日本地震学会広報紙 なゐふる, Jan. 2020, Invited
Presentations
すぐにわかるスロー地震ー日本海溝のスロー地震分布ー
西川友章
知の拠点【すぐわかアカデミア。】, 20 May 2022, 国立大学共同利用・共同研究拠点協議会 Youtubeチャンネル, Invited
スロースリップイベントによる地震活動誘発効果を 陽に組み込んだETASモデルの開発
西川 友章; 西村 卓也
東大地震研共同利用研究集会「地震活動の統計モデルと物理的意味」, 08 Mar. 2022, Invited
スロースリップイベントによる地震活動誘発効果を陽に組み込んだETASモデルの開発
西川友章; 西村卓也
日本地震学会2021年度秋季大会, 14 Oct. 2021, 日本地震学会
日本海溝海底地震津波観測網S-netが明らかにした日本海溝のスロー地震分布
西川友章; 松澤孝紀; 太田和晃; 内田直希; 西村卓也; 井出哲
日本地質学会2021年学術大会, 04 Sep. 2021, 日本地質学会, Invited
The slow earthquake spectrum of the Japan Trench illuminated by the S-net seafloor observatories
T. Nishikawa; T. Matsuzawa; K. Ohta; N. Uchida; T. Nishimura; S. Ide
Japan Geoscience Union 2021 Meeting, 06 Jun. 2021, Japan Geoscience Union, Invited