Yuji Yagi | Publications

研究成果

最新の研究成果は、Google Scholar　もしくは、TRIOS: Tsukuba Researchers Information Online System を参照してください。

論文

2017

Okuwaki, R., & Y. Yagi: Rupture Process during the MW 8.1 2017 Chiapas Mexico Earthquake: Shallow Intraplate Normal Faulting by Slab Bending, Geophys. Res. Lett., 44, https://doi.org/10.1002/2017GL075956, 2017.
Okuwaki, R., & Y. Yagi: Role of geometric barriers in irregular-rupture evolution during the 2008 Wenchuan earthquake, Geophys. J. Int., ggx502, https://doi.org/10.1093/gji/ggx502, 2017.
Anca, O., B. Enescu, Y. Yagi, & J. Zhuang: Triggering and Decay Characteristics of Dynamically Activated Seismicity in Southwest Japan, Geophys. J. Int., ggx456, https://doi.org/10.1093/gji/ggx456, 2017.
Hirano, S., & Y. Yagi: Dependence of seismic and radiated energy on shorter wavelength components, Geophys. J. Int., 209, 1585-1592, 2017.
Yamaguchi, T., T. Ichimura, Y. Yagi, R. Agata, T. Hori, & M. Hori: Fast crustal deformation computing method for multiple computations accelerated by a graphics processing unit cluster, Geophys. J. Int., 209, 787-800, 2017.
Abdel-aal, A.K. & Y. Yagi: Earthquake source characterization, moment tensor solutions, and stress field of small-moderate earthquakes occurred in the northern Red Sea Triple Junction, Geosciences Journal, 21, 235-251, 2017.
Endo, S., A. Nakao, S. Hirano, & Y. Yagi: The 2013 Sea of Okhotsk deep earthquake: A complex rupture within the Ringwoodite stability zone, Earth Evolution Sciences, 11, 23–30, 2017.

2016

Mai, M., D. Schorlemmer, M. Page, J.P. Ampuero, K. Asano, M. Causse, S. Custodio, W. Fan, G. Festa, M. Galis, F. Gallovic, W. Imperatori, M. Käser, D. Malytskyy, R. Okuwaki, F. Pollitz, L. Passone, H. N. T. Razafindrakoto, H. Sekiguchi, S. G. Song, S. N. Somala, K. K. S. Thingbaijam, C. Twardzik, M. van Driel, J. C. Vyas, R. Wang, Y. Yagi, & O. Zielke: The earthquake‐source inversion validation (SIV) project, Seism. Res. Lett., 87, 690-708, 2016.
Abdel-aal, A.K., Y. Yagi, & H. Kamal, & K. Abdelrahman: Implementation of integrated multi-channel analysis of surface waves and waveform inversion techniques for seismic hazard estimation, Arabian Journal of Geosciences, 9, 1-16, 2016.
Miyakawa, A., T. Sumita, Y. Okubo, R. Okuwaki, M. Otsubo, S. Uesawa, & Y. Yagi: Volcanic magma reservoir imaged as a low-density body beneath Aso volcano that terminated the 2016 Kumamoto earthquake rupture, Earth, Planets and Space, 68, 208, 2016.
Enescu, B., K. Shimojo, A. Opris, & Y. Yagi: Remote triggering of seismicity at Japanese volcanoes following the 2016 M7. 3 Kumamoto earthquake, Earth, Planets and Space, 68, 165, 2016.
Yagi, Y., R. Okuwaki, B. Enescu, A. Kasahara, A. Miyakawa, & M. Otsubo: Rupture process of the 2016 Kumamoto earthquake in relation to the thermal structure around Aso volcano, Earth, Planets and Space, 68, 118, 2016.
Kasahara, A., Y. Yagi, & B. Enescu: etas_solve: A Robust Program to Estimate the ETAS Model Parameters, Seism. Res. Lett., 87, 5, 1-7, 2016.
Okuwaki, R., Y. Yagi, R. Aránguiz, J. González, & G. González: Rupture Process During the 2015 Illapel, Chile Earthquake: Zigzag-Along-Dip Rupture Episodes, Pure and Applied Geophysics, 173, 1011-1020, 2016.
Meng, L., A. Zhang, & Y. Yagi: Improving back projection imaging with a novel physics-based aftershock calibration approach: A case study of the 2015 Gorkha earthquake, Geophys. Res. Lett., 43, 628–636, 2016.

2015

Aránguiz, R.,G. González, J González. P. A. Catalán, R. Cienfuegos, Y. Yagi, R. Okuwaki, L. Urra, K. Contreras, I. D. Rio, C. Rojas: The 16 September 2015 Chile tsunami from the post-tsunami survey and numerical modeling perspectives, Pure and Applied Geophysics, 173, 333-348, 2015.
Yagi, Y. & R. Okuwaki: Integrated seismic source model of the 2015 Gorkha, Nepal, earthquake, Geophys. Res. Lett., 42, 6229–6235, 2015.
Yagi, Y., R. Okuwaki, B. Enescu, & Y. Fukahata: Unusual low-angle normal fault earthquakes after the 2011 Tohoku-oki megathrust earthquake, Earth, Planets and Space, 67, 100, 2015.

2014

Okuwaki, R., Y. Yagi, & S. Hirano: Relationship between High-frequency Radiation and Asperity Ruptures, Revealed by Hybrid Back-projection with a Non-planar Fault Model, Scientific reports, 4, 7120, 2014.
Yagi, Y., R. Okuwaki, B. Enescu, H. Hirano, Y. Yamagami, S. Endo, & T. Komuro: Rupture process of the 2014 Iquique Chile earthquake in relation with the foreshock activity, Geophys. Res. Lett., 41, 4201-4206, 2014.
Funning, G. J., Y. Fukahata, Y. Yagi, & B. Parsons: A method for the joint inversion of geodetic and seismic waveform data using ABIC: application to the 1997 Manyi, Tibet, earthquake, Geophys. J. Int., 196, 1564-1579, 2014.
Fukahata, Y., Y. Yagi, & L. Rivera: Theoretical relationship between back-projection imaging and classical linear inverse solutions, Geophys. J. Int., 196, 552-559, 2014.
Shimojo, K., B. Enescu, Y. Yagi, & T. Takeda: Fluid-driven seismicity activation in northern Nagano region after the 2011 M9.0 Tohoku-oki earthquake, Geophys. Res. Lett., 41, 7524–7531, 2014.
八木勇治: 震源過程インバージョンに用いるフィルターの影響, 地震2, 66, 147-149, 2014.
木下祐介, 八反地剛, 八木勇治. 江崎隼輝, 奥村大輔: 東北地方太平洋沖地震とそれ以降の降雨による斜面崩壊: 茨城県北部の花崗岩山地における事例, 地形, 35(1), 25-39, 2014.

2013

Mitsui, Y., & Y. Yagi, Y: An interpretation of tsunami earthquake based on a simple dynamic model: Failure of shallow megathrust earthquake, Geophys. Res. Lett., 40, 1523–1527, 2013.

2012

Yagi, Y., A. Nakao, & A. Kasahara: Smooth and rapid slip near the Japan Trench during the 2011 Tohoku-oki earthquake revealed by a hybrid back-projection method, Earth Planet. Sci. Lett., 355, 94-101, 2012.
Yagi, Y., N. Nishimura, & A. Kasahara: Source process of the 12 May 2008 Wenchuan, China, earthquake determined by waveform inversion of teleseismic body waves with a data covariance matrix, Earth, Planets and Space, 64, e13-e16, 2012.
Fukahata, Y., Y. Yagi, & S. Miyazaki: Constraints on early stage rupture process of the 2011 Tohoku-oki earthquake from 1 Hz GPS data, Earth, Planets and Space, 64, 1093-1099, 2012.
深畑幸俊, 八木勇治, 三井雄太: 2011年東北地方太平洋沖地震による絶対歪みの解放：遠地実体波インバージョン解析と動的摩擦弱化, 地質学雑誌, 118, 396-409, 2012.

2011

Yagi, Y., & Y. Fukahata: Rupture process of the 2011 Tohoku-oki earthquake and absolute elastic strain release, Geophys. Res. Lett., 38, L19307, 1-5, 2011.
Koketsua, K., Y. Yokota, N. Nishimura, Y. Yagi, S. Miyazaki, K. Satake, Y. Fujii, H. Miyake, S. Sakai, Y. Yamanaka, & T Okada: A unified source model for the 2011 Tohoku earthquake, Earth Planet. Sci. Lett., 310, 480-487, 2011.
Yagi, Y., & Y. Fukahata: Introduction of uncertainty of Green's function into waveform inversion for seismic source processes, Geophys. J. Int., 186, 711-720, 2011.
Pulido N., Y. Yagi, H. Kumagai, & N. Nishimura: Rupture process and coseismic deformations of the 27 February 2010 Maule Earthquake, Chile, Earth, Planets and Space, 63, 955-959, 2011.
Suzuki, M., & Y. Yagi: Depth dependence of rupture velocity in deep earthquakes, Geophys. Res. Lett., 38, L05308, 2011.
Yagi, Y., & N. Nishimura: Moment tensor inversion of near source seismograms, Bulletin of IISEE, 45, 133-138, 2011.
Kasahara, A., & Y. Yagi: Complex seismic source process of the 2010 Haiti earthquake inferred from teleseismic body wave, Resources Environment and Life, Geological Publishing House, 112-115, 2011.
八木勇治: 2011年東北地方太平洋沖地震の震源過程, 地震2, 64, 143-153, 2011.

2010

Kostyuk, A.D., N.A. Sycheva, S.L. Yunga, L.M. Bogomolov, & Y. Yagi: Deformation of the Earth's crust in the Northern Tien Shan according to the earthquake focal data and satellite geodesy, IZVESTIYA-PHYSICS OF THE SOLID EARTH, 46, 230-243, 249-241, 2010.

2009

八木勇治: 震源過程解析手法の開発, 地震2, 61, S297-S307, 2009.

2008

Yagi, Y., & Y. Fukahata: Importance of covariance components in inversion analyses of densely sampled observed data: an application to waveform data inversion for seismic source processes, Geophys. J. Int., 175, 215-221, 2008.
Rodriguez-Lozoya, H.E., L. Quintanar, R. Ortega, C.J. Rebollar, & Y. Yagi: Rupture process of four medium-sized earthquakes that occurred in the Gulf of California, J. Geophys. Res., 113, B10301, 2008.

2007

柳沼直, 岡田知己, 長谷川昭, 加藤研一, 武村雅之, 八木勇治: 近地・遠地地震波形インヴァージョンによる2005年宮城県沖の地震(M7.2)の地震時すべり量分布 - 1978年宮城県沖地震(M7.4)との関係, 地震2, 60, 43-53, 2007.

2006

Parsons, T., R.S. Yeats, Y. Yagi, & A. Hussain: Static stress change from the 8 October, 2005 M = 7.6 Kashmir earthquake, Geophys. Res. Lett., 33, L06304, 2006.
Yaginuma T., T. Okada, Y. Yagi, T. Matsuzawa, N. Umino, & A. Hasagawa: Coseismic slip distribution of the 2005 off Miyagi earthquake (M7.2) estimated by inversion of teleseismic and regional seismograms, Earth, Planets and Space, 58, 1549-1554, 2006.

2005

Matsubara, M., Y. Yagi, & K. Obara: Plate boundary slip associated with the 2003 Off-Tokachi earthquake based on small repeating earthquake data, Geophys. Res. Lett., 32, L08316, 2005.
Yasuda, T., Y. Yagi, T. Mikumo, & T. Miyatake: A comparison between Dc’-values obtained from a dynamic rupture model and waveform inversion, Geophys. Res. Lett., 32, L14316, 2005.

2004

Miyatake, T., Y. Yagi, & T. Yasuda: The dynamic rupture process of the 2001 Geiyo, Japan, earthquake, Geophys. Res. Lett., 31, L12612, 2004.
Yagi, Y., M. Mikumo, J. Pacheco, & G. Reyes: Source rupture process of the Tecoman, Colima, Mexico earthquake of January 22, 2003, determined by joint inversion of teleseismic body wave and near source data, Bull. Seism. Soc. Am., 94, 1795-1807, 2004.
Yagi, Y.: Source rupture process of the 2003 Tokachi-oki earthquake determined by joint inversion of teleseismic body wave and strong ground motion data, Earth, Planet and Space, 56, 311-316, 2004.

2003

Mikumo, T., & Y. Yagi: Slip-weakening distance in dynamic rupture of in-slab normal-faulting earthquakes, Geophys. J. Int., 155, 443-445, 2003.
Yagi, Y., M. Kikuchi, & T. Nishimura: Co-seismic slip, post-seismic slip, and largest aftershock associated with the 1994 Sanriku-haruka-oki, Japan, earthquake, Geophys. Res. Lett., 30, 2177, 2003.
Fukahata, Y., Y. Yagi, & M. Matsu'ura: Waveform inversion for seismic source processes using ABIC with two sorts of prior constraints: Comparison between proper and improper formulations, Geophys. Res. Lett., 30, 1305, 2003.
Yagi, Y., & M. Kikuchi: Partitioning between seismogenic and aseismic slip as highlighted from slow slip events in Hyuga-nada, Japan, Geophys. Res. Lett., 30, 1087, 2003.
Mikumo, T., K.B. Olsen, E. Fukuyama, & Y. Yagi: Stress-breakdown time and slip-weakening distance inferred from slip-velocity functions on earthquake faults, Bull. Seism. Soc. Am., 93, 264-282, 2003.
Yagi, Y.: Source process of large and significant earthquakes in 2003, Bulletin of IISEE, 145-153, 2003.
Sugita, H., T. Fukuta, M. Tamura, T. Yokoi, T. Hara, T. Kashima, T. Azuhata, B. Shibasaki, Y. Yagi: IISEE-NET: Information network for earthquake disaster mitigation of developing countries, Bulletin of IISEE, 137-143, 2003.
八木勇治, 菊地正幸: 地震時滑りと非地震性滑りの相補関係. 地学雑誌, 112, 828-236, 2003.

2002

Mikumo, T., Y. Yagi, S.K. Singh, & M.A. Santoyo: Coseismic and postseismic stress changes in a subducting plate: Possible stress interactions between large interplate thrust and intraplate normal-faulting earthquakes, J. Geophys. Res., 107, B1, 2023, 2002.

2001

Yagi, Y., M. Kikuchi, & T. Sagiya: Co-seismic slip, post-seismic slip, and aftershocks associated with two large earthquakes in 1996 in Hyuga-nada, Japan, Earth, Planets and Space, 53, 793-803, 2001.

2000

Yagi, Y., & M. Kikuchi: Source rupture process of the Kocaeli, Turkey, earthquake of August 17, 1999, obtained by joint inversion of near‐field data and teleseismic data, Geophys. Res. Lett., 27, 1969–1972, 2000.
Kikuchi, M., Y. Yagi, & Y. Yamanaka: Source Process of Chi-Chi, Taiwan Earthquake of Septemer 21, 1999 Inferred from Teleseismic Body waves. Bull. Earthq. Res. Inst. Univ. Tokyo, 75, 1-13, 2000.
八木勇治, 菊地正幸: 免震構造に危険な周波数帯の波を出す震源過程について, 第2回免震・制震コロキウム講演論文集, 31-35, 2000.

1999

Yagi, Y., M. Kikuchi, S. Yoshida, & T. Sagiya: Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada Earthquakes of 1996, Geophys. Res. Lett., 26, 3161–3164, 1999.

1998

八木勇治, 菊地正幸, 吉田真吾, 山中佳子: 1968年4月1日, 日向灘地震（M7.5）の震源過程とその後の地震活動, 地震2 , 51, 139-148, 1998.

著書

八木勇治、大澤義明（編）: 巨大地震による複合災害, 筑波大学出版会, 2015.
八木勇治: 地震の基礎知識と西アジアの地震活動, 西アジア文明学への招待 (筑波大学西アジア文明センター), 悠書館, 60〜70頁, 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（編）:地球学シリーズ２　地球進化学 —地球の歴史を調べ, 考え, そして将来を予測するために—, 古今書院, 2007.

　ー高校地学関係

新編地学基礎, 数研出版, 2017.
フォトサイエンス地学図録, 数研出版, 2016
もういちど読む数研の高校地学, 数研出版, 2014
地学教授資料, 数件出版, 2013.
地学, 数研出版, 2013.
八木勇治: リアルタイムで地震を知る, 視覚でとらえるフォトサイエンス物理図録, 数研出版, 82-83, 2012.
地学基礎教授資料, 数件出版, 2011.
地学基礎, 数件出版, 2011.

その他（抜粋）

八木勇治: 2016年熊本で発生した一連の地震活動, サイエンスネット, 57, 6-9, 2016.
八木勇治: 超々深い場所で起きた超巨大地震のふしぎ, 理科の探求2015冬号, 18, 76-81, 2015.
八木勇治: 「地学基礎」「地学」の問題点, 日本地震学会モノグラム, 4, 85-87, 2015.
Sagiya, T., H. Kanamori, Y. Yagi, M. Yamada, & J. Mori: Rebuilding seismology, Nature, 473(7346), 146-148, 2011.
八木勇治: 東北地方太平洋沖地震「地震波形から見た震源像」, パリティ, 26 , 28-33, 2011.
八木勇治: 東北地方太平洋沖地震の諸モデル, 地震ジャーナル, 52, 1-9, 2011.
八木勇治: 東北地方太平洋沖地震の地震像, 建築雑誌, 1618, 5-6, 2011.
八木勇治: 地震のホヘト第10回地球深部で発生する不思議な地震深発地震, なゐふる, 82, 6, 2010.
八木勇治: 地震予知・長期的な地震発生予測・リアルタイム地震防災について, 中国・日本科学最前線 -研究の現場から-, 249-241, 2009.
八木勇治: 地震のホヘト第9回走時曲線が明らかにする地球内部構造, なゐふる, 79, 6, 2009.
八木勇治: 地震のホヘト第8回地震は点で近似できるか？−震源・震源域・余震域−, なゐふる, 76, 6, 2009.
八木勇治: 地震学における無知の知, なゐふる, 74, 6, 2009.
八木勇治: 地震のホヘト第7回地面の動きをはかる地震計, なゐふる, 73, 7, 2009.
西村直樹, 八木勇治: 四川大地震の震源像. 科学, 78, 7, 695-698, 2009.
八木勇治, 西村直樹: 地震の波から明らかになった四川大地震の震源像, なゐふる, 69, 4, 2008.
八木勇治: 地震のホヘト第6回小さな地震ほどたくさん起こる, なゐふる, 67, 6, 2008.
八木勇治: 地震のホヘト第5回大きな地震と小さな地震の関係, なゐふる, 65, 6, 2008.
八木勇治: 地震のホヘト第3回震源メカニズム, なゐふる, 60, 6, 2007.
八木勇治: 地震のホヘト第2回津波地震, なゐふる, 58, 4, 2006.
八木勇治: 地震のホヘト第1回地震の大きさをはかる, なゐふる, 55, 4, 2006.
八木勇治: 5月27日インドネシア・ジャワ島中部で発生した地震の震源過程, サイスモ, 10, 7, 11, 2006.
八木勇治: 2003年宮城県北部地震の本震・最大前震・最大余震の破壊過程, 月刊地球, 27, 2, 106-109, 2005.
八木勇治: 沈み込み帯における地震時滑りと非地震性滑りとの関係, 月刊地球, 27, 7, 542-546, 2005.
八木勇治: 2004年・2005年スマトラ沖巨大地震の震源過程, 地質と調査, 106, 23-28, 2005.
八木勇治: 震源過程解析ツールの開発, 独立行政法人建築研究所年報 (平成16年度), 58-59, 2005.
八木勇治: 2005年3月29日スマトラ沖で発生した巨大地震の震源像, サイスモ, 9, 8, 6-7, 2005.
八木勇治: 2004年12月26日スマトラ沖巨大地震の震源で何が起こったのか？, サイスモ, 9, 7, 6-7, 2005.
八木勇治, 菊地正幸: 2000年10月6日鳥取県西部地震の震源過程 (速報), 日本地震学会ニュースレター, 12, 4, 9-10, 2000.