Clarification of strength and stress of the inland crust

• Project Area: Crustal dynamics-Unified understanding of intraisland deformation after the great Tohoku-oki earthquake-
• Project/Area Number: 26109002
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Tohoku University
• Principal Investigator: 松澤 暢 東北大学, 理学研究科, 教授 (20190449)
• Co-Investigator(Kenkyū-buntansha): 伊藤 喜宏 京都大学, 防災研究所, 准教授 (30435581) ; 飯高 隆 東京大学, 地震研究所, 准教授 (00221747) ; 岡田 知己 東北大学, 理学研究科, 准教授 (30281968) ; 岩田 貴樹 常磐大学, 人間科学部, 准教授 (30418991) ; 行竹 洋平 神奈川県温泉地学研究所, その他部局等, 研究員 (20435853) ; 吉田 圭佑 東北大学, 理学研究科, 助教 (20743686)
• Project Period (FY): 2014-07-10 – 2019-03-31
• Project Status: Granted (Fiscal Year 2018)
• Budget Amount: ¥281,580,000 (Direct Cost: ¥216,600,000、Indirect Cost: ¥64,980,000); Fiscal Year 2018: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000); Fiscal Year 2017: ¥41,470,000 (Direct Cost: ¥31,900,000、Indirect Cost: ¥9,570,000); Fiscal Year 2016: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2015: ¥103,870,000 (Direct Cost: ¥79,900,000、Indirect Cost: ¥23,970,000); Fiscal Year 2014: ¥99,190,000 (Direct Cost: ¥76,300,000、Indirect Cost: ¥22,890,000)
• Keywords: 地殻応力 / 地殻強度 / 応力テンソルインバージョン / 地殻流体

Outline of Annual Research Achievements

M9.0の2011年東北地方太平洋沖地震（以後，「東北沖地震」と呼ぶ）の発生後に発震機構解の回転が検出された秋田県内とM7.3 の横ずれ断層型地震が2000 年に発生した鳥取県西部での臨時地震観測網による観測を継続した．鳥取県西部については，B01（構造班）と共同で稠密地震観測を行った．また，2011 年にM7.0 の正断層型地震が発生した福島県南東部～茨城県北部およびM7.2 の逆断層型地震である2008 年岩手宮城内陸地震が発生した東北地方脊梁部での臨時地震観測を継続した．
東北沖地震発生直後に，秋田県内で応力場が回転したように見えたが，それから5年以上経過した後も，応力場の主軸方向は変化していないことが，誤差評価も考慮したうえで確定的となった．この付近では北東-南西方向に短縮する余効変動が継続しており，このような余効変動が続いている間は弾性的な応力がかかり続けることになるので，当初予想していた以上に長期に渡って応力場が回転したままである可能性が高いことがわかってきた．
一方，東北沖地震発生後に活発化した山形-福島県境付近の群発的地震活動は，当初はほとんど余震がつかず，また，高精度の震源再決定を行った結果，震源分布がいくつもの傾いた面状に分布し，この面は発震機構解の一つの節面と走向・傾斜がほぼ一致していて，また活動は深部から浅部に移動していったことがわかった．このことから，この活動は地下深部からの流体の上昇に伴って発生した可能性が高いと考えられる．
多数の地震の押引き分布から応力場の空間分布をベイズ的に推定する新しい手法の開発に成功し，国際誌に出版した．今後，応力場の時空間変化の推定に威力を発揮すると期待される．

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

秋田県内，鳥取県西部，福島県南東部～茨城県北部，および東北地方脊梁部での臨時地震観測を予定通り実施し，手法の改良や過去のデータの解析も予定通り実施した．これにより，秋田県内の特異な応力場が，東北沖地震後5年以上たっても継続していることが明らかになり，また，仙台市や山形-秋田県境付近で東北沖地震後に発生して群発地震の解析から，これらは流体が深部から上昇してくる過程で生じた可能性が高いことを明らかにした．さらに，様々な地震の多数の余震を用いて応力を推定した結果，差応力が数十MPa程度しかないことが，次々と明らかになって来ている．また，計画時に提案していた，不均質な応力場を高信頼度で推定する新しい手法が完成して論文として出版された．
以上から，本研究課題はおおむね順調に進展していると判断した．

Strategy for Future Research Activity

地震発生域の差応力が数十MPaとかなり小さいことが明らかになって来ており，また低強度の原因として高間隙圧の可能性が高いことも，様々な証拠から明らかになって来ている．一方で，歪レート分布から期待される弾性的応力レート分布の不均質性が無視できないこともわかってきた．来年度は最終年度にあたるため，本研究で得られた応力場の情報，B03班から得られる地殻流体の分布，A02班から推定される地殻の変形の情報およびB01班から得られる構造の情報等とB02班で行われている変形実験の結果とを比較し，C01班で構築されるモデルに結びつけて，地殻の応力と強度の分布および内陸地震の発生原因を明らかにしていくることが重要である．

Research Products

• [Int'l Joint Research] カリフォルニア大学バークレー校(米国)
• [Int'l Joint Research] オタゴ大学/ヴィクトリア大学ウェリントン校(ニュージーランド)
• [Int'l Joint Research] カリフォルニア大学バークレー校(米国)
• [Int'l Joint Research] オタゴ大学/ヴィクトリア大学ウェリントン校(ニュージーランド)
• [Int'l Joint Research] カリフォルニア大学バークレー校(米国)
• [Int'l Joint Research] オタゴ大学/ヴィクトリア大学ウェリントン校(ニュージーランド)
• [Journal Article] Complex microseismic activity and depth-dependent stress field changes in Wakayama, southwestern Japan (2018)
  • Author(s): Maeda, S., T. Matsuzawa, S. Toda, K. Yoshida, and H. Katao
  • Journal Title: Earth Planets Space Volume: 70
  • DOI: 10.1186/s40623-018-0788-6
  • Peer Reviewed / Open Access
• [Journal Article] P-wave attenuation in the Pacific slab beneath northeastern Japan revealed by the spectral ratio of intraslab earthquakes (2018)
  • Author(s): Shiina, T., J. Nakajima, T. Matsuzawa
  • Journal Title: Earth Planet. Sci. Lett Volume: 489 Pages: 37-48
  • DOI: 10.1016/j.epsl.2018.02.032
  • Peer Reviewed / Open Access
• [Journal Article] Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3) (2018)
  • Author(s): Matsumoto, S., Y. Yamashita, M. Nakamoto, M. Miyazaki, S. Sakai, Y. Iio, H. Shimizu, K. Goto, T. Okada, M. Ohzono, T. Terakawa, M. Kosuga, M. Yoshimi, and Y. Asano
  • Journal Title: Geophysical Research Letters Volume: 45 Pages: 637-645
  • DOI: 10.1002/2017gl075725
  • NAID: 120006457163
  • Peer Reviewed / Open Access
• [Journal Article] A Bayesian approach to estimating a spatial stress pattern from P‐wave first‐motions (2018)
  • Author(s): Iwata, T.
  • Journal Title: Journal of Geophysical Research, Solid Earth Volume: 印刷中
  • DOI: 10.1002/2017jb015359
  • Peer Reviewed
• [Journal Article] Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption (2018)
  • Author(s): Yukutake, Y, M. Ichihara, and R. Honda
  • Journal Title: Earth, Planets and Space Volume: 70 Pages: 1-9
  • DOI: 10.1186/s40623-018-0820-x
  • Peer Reviewed / Open Access
• [Journal Article] Sendai-Okura earthquake swarm induced by the 2011 Tohoku-Oki earthquake in the stress shadow of NE Japan: Detailed fault structure and hypocenter migration (2018)
  • Author(s): Keisuke Yoshida, Akira Hasegawa
  • Journal Title: Tectonophysics Volume: in press Pages: 1-16
  • DOI: 10.1016/j.tecto.2017.12.031
  • Peer Reviewed
• [Journal Article] Anelastic properties beneath the Niigata-Kobe Tectonic Zone, Japan (2017)
  • Author(s): Nakajima Junichi、Matsuzawa Toru
  • Journal Title: Earth，Planets，Space Volume: 69 Pages: 33-33
  • DOI: 10.1186/s40623-017-0619-1
  • Peer Reviewed / Open Access
• [Journal Article] Depth variations in seismic velocity in the subducting crust: Evidence for flu-id-related embrittlement for intermediate-depth earthquakes (2017)
  • Author(s): Shiina Takahiro、Nakajima Junichi、Matsuzawa Toru、Toyokuni Genti、Kita Saeko
  • Journal Title: Geophys. Res. Lett. Volume: 44 Pages: 810-817
  • DOI: 10.1002/2016gl071798
  • NAID: 120006329011
  • Peer Reviewed
• [Journal Article] Temporal variationof intermediate-depth earthquakes around the time of the M9.0 Tohoku-oki earthquake (2017)
  • Author(s): Delbridge, B. G., S. Kita, N. Uchida, C. W. Johnson, T. Matsuzawa, and R. Burgmann
  • Journal Title: Geophysical Research Letters Volume: 44(8) Pages: 1-11
  • DOI: 10.1002/2017gl072876
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Emergence and disappearance of interplate repeating earthquakes following the 2011 M9.0 Tohoku-oki earthquake: Slip behavior transition between seismic and aseismic depending on the loading rate (2017)
  • Author(s): Hatakeyama, N., N. Uchida, T. Matsuzawa, and W. Nakamura
  • Journal Title: J. Geophys. Res. Solid Earth Volume: 122(7) Pages: 5160-5180
  • DOI: 10.1002/2016jb013914
  • Peer Reviewed / Open Access
• [Journal Article] Seismic velocity structure in the source region of the 2016 Kumamoto earthquake sequence, Japan (2017)
  • Author(s): Shito, A., S. Matsumoto, H. Shimizu, T. Ohkura, H. Takahashi, S. Sakai, T. Okada, H. Miyamachi, M. Kosuga, Y. Maeda, M. Yoshimi, Y. Asano, and M. Okubo
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 7766-7772
  • DOI: 10.1002/2017gl074593
  • Peer Reviewed / Open Access
• [Journal Article] Receiver function images of the distorted Philippine Sea slab contact with the continental crust: Implications for generation of the 1891 Nobi earthquake (Mj 8.0) (2017)
  • Author(s): Iidaka T., T. Igarashi, A. Hashima, A. Kato, and T. Iwasaki
  • Journal Title: Tectonophysics Volume: 717 Pages: 41-50
  • DOI: 10.1016/j.tecto.2017.07.010
  • Peer Reviewed / Open Access
• [Journal Article] Tidal Response in Shallow tectonic tremors (2017)
  • Author(s): Katakami, S., Y. Yamashita, H. Yakihara, H. Shimizu, Y. Ito, and K. Ohta
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 9699-9706
  • DOI: 10.1002/2017gl074060
  • Peer Reviewed / Open Access
• [Journal Article] Coseismic slip propagation on the Tohoku plate boundary fault facilitated by slip-dependent weakening during slow fault slip (2017)
  • Author(s): Ito, Y., M. J. Ikari, K. Ujiie, and A. J. Kopf
  • Journal Title: Geophysical Research Letters Volume: 44 Pages: 8749-8756
  • DOI: 10.1002/2017gl074307
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Coseismic slip model of offshore moderate interplate earthquakes on March 9, 2011 in Tohoku using tsunami waveforms (2017)
  • Author(s): Kubota T., R. Hino, D. Inazu, Y. Ito, T. Iinuma, Y. Ohta, S. Suzuki, K. Suzuki
  • Journal Title: Earth, Planet. Sci. Lett. Volume: 458 Pages: 241-251
  • DOI: 10.1016/j.epsl.2016.10.047
  • Peer Reviewed / Open Access
• [Journal Article] Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano (2017)
  • Author(s): Yukutake, Y., R. Honda, M. Harada, R. Doke, T. Saito, T. Ueno, S. Sakai, and Y. Morita
  • Journal Title: Earth, Planets and Space Volume: 69 Pages: 1-16
  • DOI: 10.1186/s40623-017-0751-y
  • Peer Reviewed / Open Access
• [Journal Article] Why do aftershocks occur? Relationship between mainshock rupture and aftershock sequence based on highly resolved hypocenter and focal mechanism distributions (2017)
  • Author(s): Yukutake, Y., and Y. Iio
  • Journal Title: Earth Planets Space Volume: 69
  • DOI: 10.1186/s40623-017-0650-2
  • NAID: 120006364096
  • Peer Reviewed / Open Access
• [Journal Article] Temporal changes in stress drop, frictional strength, and earthquake size distribution in the 2011 Yamagata-Fukushima, NE Japan, earthquake swarm, caused by fluid migration (2017)
  • Author(s): Keisuke Yoshida, Tatsuhiko Saito, Yumi Urata, Youichi Asano, Akira Hasegawa
  • Journal Title: J. Geophys. Res. Solid Earth Volume: 122 Pages: 10379-10397
  • DOI: 10.1002/2017jb014334
  • Peer Reviewed
• [Journal Article] 3-D dynamic rupture simulations of the 2016 Kumamoto, Japan, earthquake (2017)
  • Author(s): Urata, Y., K. Yoshida, E. Fukuyama, and H. Kubo
  • Journal Title: Earth Planets Space Volume: 69
  • DOI: 10.1186/s40623-017-0733-0
  • Peer Reviewed / Open Access
• [Journal Article] Overpressurized fluids drive microseismic swarm activity around Mt. Ontake volcano, Japan (2017)
  • Author(s): Terakawa, T.
  • Journal Title: Earth Planets Space Volume: 69
  • DOI: 10.1186/s40623-017-0671-x
  • Peer Reviewed / Open Access
• [Journal Article] Variation in high-frequency wave radiation from small repeating earthquakes as revealed by cross-spectral analysis (2016)
  • Author(s): Hatakeyama, N., N. Uchida, T. Matsuzawa, T. Okada, J. Nakajima, T. Matsushima, T. Kono, S. Hirahara, and T. Nakayama
  • Journal Title: Geophys. J. Int. Volume: 207(2) Pages: 1030-1048
  • DOI: 10.1093/gji/ggw313
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Heterogeneous mantle anisotropy and fluid upwelling: Implication for generation of the 1891 Nobi earthquake (2016)
  • Author(s): Iidaka, T, Y. Hiramatsu, The Research Group for the Joint Seismic Observations at the Nobi Area
  • Journal Title: Earth Planets Space Volume: 68 Pages: 164-164
  • DOI: 10.1186/s40623-016-0540-z
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Heterogeneous stress state of islandarc crust in northeastern Japan affected by hot mantle fingers (2016)
  • Author(s): Shibazaki, B., T. Okada, J. Muto, T. Matsumoto, T. Yoshida, and K. Yoshida
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 121 Pages: 3099-3117
  • DOI: 10.1002/2015jb012664
  • Peer Reviewed / Open Access
• [Journal Article] Temporal variation of frictional strength in an earthquake swarm in NE Japan caused by fluid migration (2016)
  • Author(s): Yoshida, K., A. Hasegawa and T. Yoshida
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 121 Pages: 5953-5965
  • DOI: 10.1002/2016jb013022
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Stress rotations due to the M6.5 foreshck and M7.3 mainshock in the 2016 Kumamoto, SW Japan, earthquake sequence (2016)
  • Author(s): Yoshida, K., A. Hasegawa, T. Saito, Y. Asano, S. Tanaka, K. Sawazaki, Y. Urata, E. Fukuyama
  • Journal Title: Geophys. Res. Lett. Volume: 43
  • Peer Reviewed
• [Journal Article] Determination of temporal changes in seismic velocity caused by volcanic activity in and around Hakone volcano, central Japan, using ambient seismic noise records (2016)
  • Author(s): Yukutake, Y., T. Ueno, K. Miyaoka
  • Journal Title: Progress in Earth and Planetary Science Volume: 3
  • DOI: 10.1186/s40645-016-0106-5
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Slow slip near the trench at the Hikurangi subduction zone, New Zealand (2016)
  • Author(s): Wallace, L., S. Webb, Y. Ito, K. Mochizuki, R. Hino, S. Henrys, S. Schwartz, and A. Sheehan
  • Journal Title: Science Volume: 352 Pages: 701-704
  • DOI: 10.1126/science.aaf2349
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Tohoku rupture reloaded? (2016)
  • Author(s): Burgmann, R., N. Uchida, Y. Hu, and T. Matsuzawa
  • Journal Title: Nature Geoscience Volume: 9 Pages: 183-184
  • DOI: 10.1038/ngeo2649
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Variety of Aftershock Decays in the Rate- and State-Friction Model Due to the Effect of Secondary Aftershocks: Implications Derived from an Analysis of Real Aftershock Sequences (2016)
  • Author(s): Iwata, T.
  • Journal Title: Pure and Applied Geophysics Volume: 173 Pages: 21-33
  • DOI: 10.1007/s00024-015-1151-5
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Unusual stress rotations within the Philippines possibly caused by slip heterogeneity along the Philippine fault (2016)
  • Author(s): Yoshida, K., N. Pulido, and E. Fukuyama
  • Journal Title: J. Geophys. Res Volume: 印刷中
  • DOI: 10.1002/2015jb012275
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spatially heterogeneous stress field in the source area of the 2011 Mw 6.6 Fukushima-Hamadori earthquake, NE Japan, probably caused by static stress change (2015)
  • Author(s): Yoshida, K., A. Hasegawa, and T. Okada
  • Journal Title: Geophys. J. Int. Volume: 201 Pages: 1060-1069
  • DOI: 10.1093/gji/ggv068
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spatial variation of stress orientations in NE Japan revealed by dense seismic observations (2015)
  • Author(s): Yoshida, K., A. Hasegawa, and T. Okada
  • Journal Title: Tectonophysics Volume: 647-648 Pages: 62-72
  • DOI: 10.1016/j.tecto.2015.02.013
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Decomposition of seasonality and long-term trend in seismological data: A Bayesian Modelling of earthquake detection capability (2014)
  • Author(s): Takaki Iwata
  • Journal Title: Australian & New Zealand Journal of Statistics Volume: 56 Pages: 201-215
  • DOI: 10.1111/anzs.12079
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 南海トラフ地震に関する地震学の現状 (2018)
  • Author(s): 松澤暢
  • Organizer: シンポジウム「南海トラフ巨大地震の広域被災に備える減災活動の現状と将来」
  • Invited
• [Presentation] hree-dimensional seismic velocity structure beneath the northern South Island, New Zealand from dense seismic observation (2017)
  • Author(s): Okada, T., Y. Iio, S. Matsumoto, S. Bannister, S. Ohmi, S. Horiuchi, T. Sato, T. Miura, J. Pettinga, F. Ghisetti, and R. H. Sibson
  • Organizer: IAG-IASPEI 2017
  • Int'l Joint Research
• [Presentation] Seismic tomography in the northern South Island and the 2016 Kaikoura earthquake (2017)
  • Author(s): Okada, T., Y. Iio, S. Matsumoto, S. Bannister, S. Ohmi, S. Horiuchi, T. Sato, T. Miura, J. Pettinga, F. Ghisetti, and R. H. Sibson
  • Organizer: Geoscience society of New Zealand Annual Conference 2017
  • Int'l Joint Research
• [Presentation] Seismic waves triggering slow slip event on the pressure gauge records in the Hikurangi subducting margin (2017)
  • Author(s): Ito, Y., Y. Kaneko, L. Wallace, S. Henrys, S. Webb, T. Muramoto, K. Ohta, K. Mochizuki, S. Suzuki, M. Kido and R. Hino
  • Organizer: AGU 2017
  • Int'l Joint Research
• [Presentation] Slip-dependent weakening on shallow plate boundary fault in the Japan subduction zone: shallow coseismic slip facilitated by foreshock afterslip (2017)
  • Author(s): Ito, Y., M. Ikari, K. Ujiie and A. Kopf
  • Organizer: EGU 2017
  • Int'l Joint Research
• [Presentation] Interaction between slow and fast slips in the Japan Trench: Prospect from near field ocean bottom seismic and geodetic observations (2017)
  • Author(s): Ito, Y., S. Katakami, K. Ohta, M. Uemura, T. Muramoto, and E. S. M. Garcia
  • Organizer: SSA 2017
  • Int'l Joint Research / Invited
• [Presentation] Development of a method to estimate spatial stress pattern from P-wave first motion data: an application to a real dataset (2017)
  • Author(s): Iwata, T.
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] The spatial distribution of the stress ratio in the aftershock area of the 2000 Western Tottori Earthquake (2017)
  • Author(s): Iwata, T.
  • Organizer: IAG-IASPEI 2017
  • Int'l Joint Research
• [Presentation] Stress field in the aftershock area of the 2000 Western Tottori Earthquake estimated by a Bayesian stress inversion analyzing P-wave first motion data (2017)
  • Author(s): Iwata. T.
  • Organizer: FSEF 2017
  • Int'l Joint Research
• [Presentation] Heterogeneities of stress and strength and its relationship with induced seismic activities associated with the Tohoku-Oki earthquake (2017)
  • Author(s): Yoshida, K., A. Hasegawa, and T. Matsuzawa
  • Organizer: SSA 2017
  • Int'l Joint Research / Invited
• [Presentation] Details of hypocenter migration in the Yamagata-Fukushima border earthquake swarm probably caused by fluid pressure change after the 2011 Tohoku-Oki earthquake (2017)
  • Author(s): Yoshida, K., and A. Hasegawa
  • Organizer: JpGU-AGU joint meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] Details of hypocenter migration of aftershocks of the 2011 Tohoku-Oki earthquake caused in the stress shadow probably due to the fluid pressure change (2017)
  • Author(s): Yoshida, K., and A. Hasegawa
  • Organizer: FSEF 2017
  • Int'l Joint Research / Invited
• [Presentation] Monitoring eruption activity using temporal stress changes at Mount Ontake volcano (2017)
  • Author(s): Terakawa,T., Y. Yamanaka, Y. Maeda, S. Horikawa, and T. Okuda
  • Organizer: IAG-IASPEI 2017
  • Int'l Joint Research
• [Presentation] A Bayesian approach to estimate a spatial stress pattern from P-wave first motion polarities (2016)
  • Author(s): Iwata, T.
  • Organizer: AGU 2016 Fall Meeting
  • Place of Presentation: サンフランシスコ（米国）
  • Year and Date: 2016-12-15
  • Int'l Joint Research
• [Presentation] Velocity- and slip-dependent weakening on the Tohoku plate boundary fault: shallow coseismic slip facilitated by foreshock afterslip (2016)
  • Author(s): Ito, Y., M. Ikari, K. Ujiie, and A. Kopf
  • Organizer: AGU 2016 Fall Meeting
  • Place of Presentation: サンフランシスコ（米国）
  • Year and Date: 2016-12-13
  • Int'l Joint Research
• [Presentation] How to use slow earthquakes: Monitering and exploiting slow earthquakes to megathrust event (2016)
  • Author(s): Ito, Y.
  • Organizer: RAUGM 2016
  • Place of Presentation: プエルトバヤルタ（メキシコ）
  • Year and Date: 2016-11-01
  • Int'l Joint Research
• [Presentation] P波初動データに基づく応力テンソルの空間パターン推定 (2016)
  • Author(s): 岩田貴樹
  • Organizer: 日本地震学会2016年度秋季大会
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2016-10-07
• [Presentation] 応力場の時間変化に基づく御獄火山のモニタリング (2016)
  • Author(s): 寺川寿子・山中佳子・前田裕太・堀川信一郎・松廣健二郎・奥田隆
  • Organizer: 日本地震学会2016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] 稠密地震観測で求めた、東北沖地震後の内陸誘発地震のメカニズム解 (2016)
  • Author(s): 岡田知己・中山貴史・平原聡・堀修一郎・佐藤俊也・松澤暢・長谷川昭・吉田圭佑・2011年東北地方太平洋沖地震合同余震観測グループ
  • Organizer: 日本地震学会2016年度秋季大会
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2016-10-05
• [Presentation] 東北沖地震で誘発された山形-福島県境群発地震の震源域における 応力降下量およびb値の時間変化と摩擦強度 (2016)
  • Author(s): 吉田圭佑・齋藤竜彦・浅野陽一・長谷川昭
  • Organizer: 日本地震学会2016年大会
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2016-10-05
• [Presentation] A statistical approach to estimate a spatial stress pattern from P-wave first motion polarity data : its development and a numerical simulation (2016)
  • Author(s): Iwata, T.
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-22
  • Int'l Joint Research
• [Presentation] Strategy to evaluate the stress in the crust (2016)
  • Author(s): Matsuzawa, T.
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] Precise focal mechanisms of the induced earthquake swarm by the 2011 Tohoku-Oki earthquake by a dense seismic observation (2016)
  • Author(s): Okada, T., T. Nakayama, S. Hirahara, S. Hori, T. Sato, and T. Matsuzawa
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] Temporal stress changes at Mt. Ontake volcano (2016)
  • Author(s): Terakawa, T.
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] Stress and strength heterogeneities and its relationship with induced seismic activities associated with the Tohoku-Oki Earthquake (2016)
  • Author(s): Yoshida, K., A. Hasegawa, and T. Matsuzawa
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] S-wave anisotropy in the crust of east Japan before and after the 2011 Tohoku-oki earthquake (2016)
  • Author(s): Yoshida, K., A. Hasegawa, T. Okada, J. Nakajima, and Group for Aftershock Observations of the 2011 Tohoku-Oki Earthquake
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] Relationship between mainshock rupture and aftershock sequence based on highly resolved hypocenter, focal mechanism distributions (2016)
  • Author(s): Yukutake, Y., and Y. Iio
  • Organizer: Crustal Dynamics 2016
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] 応力場の時間変化に基づく御獄火山のモニタリング (2016)
  • Author(s): 寺川寿子・加藤愛太郎・前田裕太・山中佳子・堀川信一郎・松廣健二郎・奥田隆
  • Organizer: 日本地球惑星科学連合大会2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-25
• [Presentation] 中央構造線の活動のモデル化に向けた西南日本の応力方向の詳細な空間分布の推定 (2016)
  • Author(s): 吉田圭佑・福山英一
  • Organizer: 日本地球惑星科学連合大会2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-25
• [Presentation] 2016年熊本地震震源域周辺の応力場 (2016)
  • Author(s): 吉田圭佑・長谷川昭・齊藤竜彦・浅野陽一・田中佐千子・澤崎郁・浦田優美・福山英一
  • Organizer: 日本地球惑星科学連合大会2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-25
• [Presentation] 東北日本の応力不均質と2011年東北沖地震による誘発地震活動 (2016)
  • Author(s): 吉田圭佑・長谷川昭・松澤暢
  • Organizer: 日本地球惑星科学連合大会2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-24
• [Presentation] P波初動データを用いた応力空間パターン推定手法の開発：予備的な数値実験 (2016)
  • Author(s): 岩田貴樹
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-23
• [Presentation] 2015年箱根火山水蒸気噴火に伴い観測された連続微動 (2016)
  • Author(s): 行竹洋平・本多亮・原田昌武・道家涼介・齊藤竜彦・上野友岳・酒井慎一・森田裕一
  • Organizer: 地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-23
• [Presentation] P波初動データを用いた応力空間パターン推定手法の開発：予備的な数値実験 (2016)
  • Author(s): 岩田貴樹
  • Organizer: 地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉市）
  • Year and Date: 2016-05-23
• [Presentation] Two effects of slow earthquakes on large megathrust earthquakes: Triggering and facilitating of coseismic slip (2016)
  • Author(s): Ito, Y., and M. Ikari
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-22
• [Presentation] Effect of stress and fluid pressure change on shallow earthquake swarm induced by the 2011 Tohoku-Oki earthquake inferred from dense seismic observation (2016)
  • Author(s): Okada, T., T. Nakayama, S. Hirahara, S. Hori, T. Sato, and T. Matsuzawa
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-22
• [Presentation] A new standard installation method of the offline seismic observation station in heavy snowfall area of Tohoku region (2015)
  • Author(s): Hirahara, S., T. Nakayama, S. Hori, T. Sato, Y. Chiba, T. Okada, and T. Matsuzawa
  • Organizer: AGU 2015 Fall Meeting
  • Place of Presentation: San Francisco（米国）
  • Year and Date: 2015-12-16
  • Int'l Joint Research
• [Presentation] Spatially heterogeneous stress orientation in the Philippines caused by the slip heterogeneity along the Philippine fault (2015)
  • Author(s): Yoshida, K., N. P. Hernandez, and E. Fukuyama
  • Organizer: AGU 2015 Fall Meeting
  • Place of Presentation: San Francisco（米国）
  • Year and Date: 2015-12-16
  • Int'l Joint Research
• [Presentation] 2011年東北沖地震後に福島-山形県境で多発する誘発地震活動に見られるメカニズム解の多様性と応力・摩擦強度の時空間発展 (2015)
  • Author(s): 吉田圭佑，長谷川昭
  • Organizer: 日本地震学会2015年大会
  • Place of Presentation: 神戸国際会議場（神戸市）
  • Year and Date: 2015-10-28
• [Presentation] S波偏向異方性によるいわき市内陸部における応力場の深さ依存性検出の試み (2015)
  • Author(s): 飯高隆，五十嵐俊博，小原一成，酒井慎一，加藤愛太郎，武田哲也
  • Organizer: 日本地震学会2015年大会
  • Place of Presentation: 神戸国際会議場（神戸市）
  • Year and Date: 2015-10-28
• [Presentation] 稠密合同余震観測データを用いて推定した2008 年岩手・宮城内陸地震余震の応力降下量：断層強度との比較 (2015)
  • Author(s): 吉田圭佑・長谷川昭・岡田知己・内田直希
  • Organizer: 日本地球惑星科学連合 連合大会 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] 震源及びメカニズム解分布に基づいた本震断層と余震との関係 (2015)
  • Author(s): 行竹洋平・飯尾能久
  • Organizer: 地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ（千葉市）
  • Year and Date: 2015-05-24
• [Presentation] Statistical models to describe the spatio-temporal patterns of earthquakes: Epidemic Type Aftershock Sequence (ETAS) model and related model (2015)
  • Author(s): Iwata, Takaki
  • Organizer: School/Workshop on Fluctuations, Slow Dynamics and Internal Time in Complex Critical Systems
  • Place of Presentation: 芸文館（岡山県倉敷市）
  • Year and Date: 2015-03-24
  • Invited
• [Presentation] 内陸域における地震活動の発生過程に関する研究 (2014)
  • Author(s): 行竹洋平
  • Organizer: 2014年地震学会秋季大会
  • Place of Presentation: 朱鷺メッセ（新潟県新潟市）
  • Year and Date: 2014-11-24
  • Invited
• [Remarks] 地殻ダイナミクス
  • URL: http://cd.dpri.kyoto-u.ac.jp/
• [Funded Workshop] International Symposium Crustal Dynamics 2016: Unified Understanding of Geodynamic Processes at Different Time and Length Scales (2016)
  • Place of Presentation: 高山市民文化会館（岐阜県高山市）
  • Year and Date: 2016-07-19