Yagi Yuji

J-GLOBAL         Last updated: Jul 9, 2019 at 02:41
Yagi Yuji
University of Tsukuba
Faculty of Life and Environmental Sciences
Job title

Research Areas


Academic & Professional Experience

Apr 2018
Professor, Faculty of Life and Environmental Sciences, University of Tsukuba
Oct 2011
Mar 2018
Associate Professor, Faculty of Life and Environmental Sciences, University of Tsukuba

Awards & Honors

Best Faculty Member, University of Tsukuba, University of Tsukuba
May 2009
Young Scientist Award (The Seismological Society of Japan), The Seismological Society of Japan
Nov 2004
The Earth, Planets and Space Young Researcher Award

Published Papers

Okuwaki, Ryo;Kasahara, Amato;Yagi, Yuji;Hirano, Shiro;Fukahata, Yukitoshi
Geophysical Journal International   216(3) 1529-1537   Nov 2018   [Refereed]
Waveform backprojection (BP) is a key technique of earthquake-source imaging, which has been widely used for extracting information of earthquake source evolution that cannot be obtained by kinematic source inversion. The technique enjoys consider...
Aranguiz, Rafael;Urra, Luisa;Okuwaki, Ryo;Yagi, Yuji
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES   18(8) 2143-2160   Aug 2018   [Refereed]
Tamaribuchi, Koji;Yagi, Yuji;Enescu, Bogdan;Hirano, Shiro
Earth, Planets and Space   70    May 2018   [Refereed]
We investigated the foreshock activity characteristics using the Japan Meteorological Agency Unified Earthquake Catalog for the last 20 years. Using the nearest-neighbor distance approach, we systematically and objectively classified the earthquak...
Okuwaki, Ryo;Yagi, Yuji
GEOPHYSICAL JOURNAL INTERNATIONAL   212(3) 1657-1664   Nov 2017   [Refereed]
Geometric discontinuities within fault systems known as geometric barriers contribute to irregular rupture evolutions during earthquakes. We applied a hybrid backprojection method to high-frequency teleseismic P-waveforms to investigate the role o...
Okuwaki, Ryo;Yagi, Yuji
Geophysical Research Letters   44(23) 11816-11823   Nov 2017   [Refereed]
A seismic source model for the M-w 8.1 2017 Chiapas, Mexico, earthquake was constructed by kinematic waveform inversion using globally observed teleseismic waveforms, suggesting that the earthquake was a normal-faulting event on a steeply dipping ...

Books etc

八木勇治;大澤義明 (Part:Editor)
筑波大学出版会   Nov 2015   ISBN:4904074386
八木勇治 (Part:Contributor, 地震の基礎知識と西アジアの地震活動)
悠書館   2014   
指田勝男;久田, 健一郎;角替, 敏昭;八木, 勇治;小室, 光世;興野, 純 (Part:Editor)
Apr 2007   ISBN:9784772252041
新編 地学基礎 (地基/309)
数研出版   2017   
数研出版   Jun 2016   ISBN:9784410290923

Conference Activities & Talks

Contrasting patterns of rainfall-induced and earthquake-induced shallow landslides in granitic mountains, northern Ibaraki Prefecture, Japan
Hattanji, Tsuyoshi;Akihiko, Kawai;Matsushima, Takashi;Yagi, Yuji
日本地球惑星科学連合2018年大会   23 May 2018   日本地球惑星科学連合
Demonstration of improved seismic source inversion method of tele-seismic body wave
Yagi, Yuji;Okuwaki, Ryo
The 2017 AGU Fall Meeting   11 Dec 2017   American Geophysical Union
Seismic rupture inversion of tele-seismic body wave has been widely applied to studies of large earthquakes. In general, tele-seismic body wave contains information of overall rupture process of large earthquake, while the tele-seismic body wave i...
Flexible kinematic earthquake rupture inversion of tele-seismic waveforms: Application to the 2013 Balochistan, Pakistan earthquake
Shimizu, Kyusuke;Yagi, Yuji;Okuwaki, Ryo;Kasahara, Amato
The 2017 AGU Fall Meeting   11 Dec 2017   American Geophysical Union
The kinematic earthquake rupture models are useful to derive statistics and scaling properties of the large and great earthquakes. However, the kinematic rupture models for the same earthquake are often different from one another. Such sensitivity...
Potency backprojection
Okuwaki, Ryo;Kasahara, Amato;Yagi, Yuji
The 2017 AGU Fall Meeting   11 Dec 2017   American Geophysical Union
The backprojection (BP) method has been one of the powerful tools of tracking seismic-wave sources of the large/mega earthquakes. The BP method projects waveforms onto a possible source point by stacking them with the theoretical-travel-time shift...
A Bayesian hierarchical model for a seismic source inversion
Kasahara, Amato;Yagi, Yuji
A source inversion analysis using spatio-temporal displacement field data is able to be formulated as a discrete linear inverse problem when the Green function and the source fault are known. However, it is difficult to calculate an accurate Green...

Research Grants & Projects

Development of simultaneous estimation method of fault geometry and slip distribution of large earthquake
Japan Society of for the Promotion of Science: Grant-in-Aid for Scientific Research(C)
Project Year: Apr 2019 - Mar 2022    Investigator(s): Yuji Yagi


Apr 2017
Progress in Earth and Planetary Science: Editor
Jul 2015
Scientific Reports: Edition Board Member