Works by Obana, Koichiro

Results: 34

Normal-faulting earthquakes beneath the outer slope of the Japan Trench after the 2011 Tohoku earthquake: Implications for the stress regime in the incoming Pacific plate.

Published in:

Geophysical Research Letters, 2012, v. 39, n. 7, p. n/a, doi. 10.1029/2011GL050399

By:

Obana, Koichiro;
Fujie, Gou;
Takahashi, Tsutomu;
Yamamoto, Yojiro;
Nakamura, Yasuyuki;
Kodaira, Shuichi;
Takahashi, Narumi;
Kaneda, Yoshiyuki;
Shinohara, Masanao

Publication type:

Article

The nature of the Pacific plate as subduction inputs to the northeastern Japan arc and its implication for subduction zone processes.

Published in:

Progress in Earth & Planetary Science, 2023, v. 10, n. 1, p. 1, doi. 10.1186/s40645-023-00578-8

By:

Fujie, Gou;
Kodaira, Shuichi;
Obana, Koichiro;
Yamamoto, Yojiro;
Isse, Takehi;
Yamada, Tomoaki;
No, Tetsuo;
Nakamura, Yasuyuki;
Miura, Seiichi

Publication type:

Article

Incoming plate structure at the Japan Trench subduction zone revealed in densely spaced reflection seismic profiles.

Published in:

Progress in Earth & Planetary Science, 2023, v. 10, n. 1, p. 1, doi. 10.1186/s40645-023-00579-7

By:

Nakamura, Yasuyuki;
Kodaira, Shuichi;
Fujie, Gou;
Yamashita, Mikiya;
Obana, Koichiro;
Miura, Seiichi

Publication type:

Article

Tectonic evolution of the Nootka fault zone and deformation of the shallow subducted Explorer plate in northern Cascadia as revealed by earthquake distributions and seismic tomography.

Published in:

Scientific Reports, 2023, v. 13, n. 1, p. 1, doi. 10.1038/s41598-023-33310-z

By:

Hutchinson, Jesse;
Kao, Honn;
Riedel, Michael;
Obana, Koichiro;
Wang, Kelin;
Kodaira, Shuichi;
Takahashi, Tsutomu;
Yamamoto, Yojiro

Publication type:

Article

Configuration and structure of the Philippine Sea Plate off Boso, Japan: constraints on the shallow subduction kinematics, seismicity, and slow slip events.

Published in:

Earth, Planets & Space, 2019, v. 71, n. 1, p. N.PAG, doi. 10.1186/s40623-019-1090-y

By:

Ito, Aki;
Tonegawa, Takashi;
Uchida, Naoki;
Yamamoto, Yojiro;
Suetsugu, Daisuke;
Hino, Ryota;
Sugioka, Hiroko;
Obana, Koichiro;
Nakahigashi, Kazuo;
Shinohara, Masanao

Publication type:

Article

Lateral variation of the uppermost oceanic plate in the outer-rise region of the Northwest Pacific Ocean inferred from Po-to-s converted waves.

Published in:

Earth, Planets & Space, 2018, v. 70, n. 1, p. 1, doi. 10.1186/s40623-018-0880-y

By:

Tonegawa, Takashi;
Obana, Koichiro;
Fujie, Gou;
Kodaira, Shuichi

Publication type:

Article

Tomographic image of crust and upper mantle off the Boso Peninsula using data from an ocean-bottom seismograph array.

Published in:

2017

By:

Ito, Aki;
Yamamoto, Yojiro;
Hino, Ryota;
Suetsugu, Daisuke;
Sugioka, Hiroko;
Nakano, Masaru;
Obana, Koichiro;
Nakahigashi, Kazuo;
Shinohara, Masanao

Publication type:

Letter

Upper boundaries of the Pacific and Philippine Sea plates near the triple junction off the Boso Peninsula deduced from ocean-bottom seismic observations.

Published in:

2017

By:

Ito, Aki;
Sugioka, Hiroko;
Obana, Koichiro;
Hino, Ryota;
Suetsugu, Daisuke;
Nakahigashi, Kazuo;
Shinohara, Masanao;
Nakano, Masaru;
Yamamoto, Yojiro

Publication type:

Letter

Fault geometry of M6-class normal-faulting earthquakes in the outer trench slope of Japan Trench from ocean bottom seismograph observations.

Published in:

Progress in Earth & Planetary Science, 2023, v. 10, n. 1, p. 1, doi. 10.1186/s40645-023-00541-7

By:

Obana, Koichiro;
Takahashi, Tsutomu;
Yamamoto, Yojiro;
Iinuma, Takeshi;
Nakamura, Yasuyuki;
Fujie, Gou;
Miura, Seiichi;
Kodaira, Shuichi

Publication type:

Article

Distribution and migration of aftershocks of the 2010 Mw 7.4 Ogasawara Islands intraplate normal-faulting earthquake related to a fracture zone in the Pacific plate.

Published in:

Geochemistry, Geophysics, Geosystems: G3, 2014, v. 15, n. 4, p. 1363, doi. 10.1002/2014GC005246

By:

Obana, Koichiro;
Takahashi, Tsutomu;
No, Tetsuo;
Kaiho, Yuka;
Kodaira, Shuichi;
Yamashita, Mikiya;
Sato, Takeshi;
Nakamura, Takeshi

Publication type:

Article

Along-arc variation in seismic velocity structure related to variable growth of arc crust in northern Izu-Bonin intraoceanic arc.

Published in:

Geochemistry, Geophysics, Geosystems: G3, 2010, v. 11, n. 8, p. n/a, doi. 10.1029/2010GC003146

By:

Obana, Koichiro;
Kamiya, Shin'ichiro;
Kodaira, Shuichi;
Suetsugu, Daisuke;
Takahashi, Narumi;
Takahashi, Tsutomu;
Tamura, Yoshihiko

Publication type:

Article

Ambient seafloor noise excited by earthquakes in the Nankai subduction zone.

Published in:

Nature Communications, 2015, v. 6, n. 1, p. 6132, doi. 10.1038/ncomms7132

By:

Tonegawa, Takashi;
Fukao, Yoshio;
Takahashi, Tsutomu;
Obana, Koichiro;
Kodaira, Shuichi;
Kaneda, Yoshiyuki

Publication type:

Article

Seismic Structure Characterizing the Large Shallow Slip Zone of the 17th‐Century Kuril Earthquake.

Published in:

Journal of Geophysical Research. Solid Earth, 2025, v. 130, n. 5, p. 1, doi. 10.1029/2024JB030764

By:

Azuma, Ryosuke;
Hino, Ryota;
Fujie, Gou;
Obana, Koichiro;
Ohta, Yusaku;
Kodaira, Shuichi

Publication type:

Article

Three‐Dimensional P Wave Velocity Structure of the Northern Hikurangi Margin From the NZ3D Experiment: Evidence for Fault‐Bound Anisotropy.

Published in:

Journal of Geophysical Research. Solid Earth, 2020, v. 125, n. 12, p. 1, doi. 10.1029/2020JB020433

By:

Arai, Ryuta;
Kodaira, Shuichi;
Henrys, Stuart;
Bangs, Nathan;
Obana, Koichiro;
Fujie, Gou;
Miura, Seiichi;
Barker, Daniel;
Bassett, Dan;
Bell, Rebecca;
Mochizuki, Kimihiro;
Kellett, Richard;
Stucker, Valerie;
Fry, Bill

Publication type:

Article

Deep Investigations of Outer‐Rise Tsunami Characteristics Using Well‐Mapped Normal Faults Along the Japan Trench.

Published in:

Journal of Geophysical Research. Solid Earth, 2020, v. 125, n. 10, p. 1, doi. 10.1029/2020JB020060

By:

Baba, Toshitaka;
Chikasada, Naotaka;
Nakamura, Yasuyuki;
Fujie, Gou;
Obana, Koichiro;
Miura, Seiichi;
Kodaira, Shuichi

Publication type:

Article

S wave attenuation structure on the western side of the Nankai subduction zone: Implications for fluid distribution and dynamics.

Published in:

Journal of Geophysical Research. Solid Earth, 2014, v. 119, n. 10, p. 7805, doi. 10.1002/2014JB011103

By:

Takahashi, Tsutomu;
Obana, Koichiro;
Yamamoto, Yojiro;
Nakanishi, Ayako;
Kodaira, Shuichi;
Kaneda, Yoshiyuki

Publication type:

Article

Structural heterogeneities around the megathrust zone of the 2011 Tohoku earthquake from tomographic inversion of onshore and offshore seismic observations.

Published in:

Journal of Geophysical Research. Solid Earth, 2014, v. 119, n. 2, p. 1165, doi. 10.1002/2013JB010582

By:

Yamamoto, Yojiro;
Obana, Koichiro;
Kodaira, Shuichi;
Hino, Ryota;
Shinohara, Masanao

Publication type:

Article

Random inhomogeneities in the northern Izu-Bonin arc estimated by tomographic inversion of peak delay times of S wave seismograms.

Published in:

Journal of Geophysical Research. Solid Earth, 2011, v. 116, n. B3, p. n/a, doi. 10.1029/2010JB007691

By:

Takahashi, Tsutomu;
Obana, Koichiro;
Kodaira, Shuichi;
Suetsugu, Daisuke;
Takahashi, Narumi;
Kamiya, Shin'ichiro;
Tamura, Yoshihiko

Publication type:

Article

Seismicity in the incoming/subducting Philippine Sea plate off the Kii Peninsula, central Nankai trough.

Published in:

Journal of Geophysical Research. Solid Earth, 2005, v. 110, n. B11, p. n/a, doi. 10.1029/2004JB003487

By:

Obana, Koichiro;
Kodaira, Shuichi;
Kaneda, Yoshiyuki

Publication type:

Article

Structural factors controlling the coseismic rupture zone of the 1973 Nemuro-Oki earthquake, the southern Kuril Trench seismogenic zone.

Published in:

Journal of Geophysical Research. Solid Earth, 2004, v. 109, n. B5, p. n/a, doi. 10.1029/2003JB002574

By:

Nakanishi, Ayako;
Smith, Alex J.;
Miura, Seiichi;
Tsuru, Tetsuro;
Kodaira, Shuichi;
Obana, Koichiro;
Takahashi, Narumi;
Cummins, Phil R.;
Kaneda, Yoshiyuki

Publication type:

Article

Microseismicity at the seaward updip limit of the western Nankai Trough seismogenic zone.

Published in:

Journal of Geophysical Research. Solid Earth, 2003, v. 108, n. B10, p. n/a, doi. 10.1029/2002JB002370

By:

Obana, Koichiro;
Kodaira, Shuichi;
Kaneda, Yoshiyuki;
Mochizuki, Kimihiro;
Shinohara, Masanao;
Suyehiro, Kiyoshi

Publication type:

Article

Seismicity related to heterogeneous structure along the western Nankai trough off Shikoku Island.

Published in:

Geophysical Research Letters, 2006, v. 33, n. 23, p. n/a, doi. 10.1029/2006GL028179

By:

Obana, Koichiro;
Kodaira, Shuichi;
Kaneda, Yoshiyuki

Publication type:

Article

Micro-seismicity around the seaward updip limit of the 1946 Nankai Earthquake dislocation area.

Published in:

Geophysical Research Letters, 2001, v. 28, n. 12, p. 2333, doi. 10.1029/2000GL012794

By:

Obana, Koichiro;
Kodaira, Shuichi;
Mochizuki, Kimihiro;
Shinohara, Masanao

Publication type:

Article

Crosscorrelation of Earthquake Data Using Stationary Phase Evaluation: Insight into Reflection Structures of Oceanic Crust Surface in theNankaiTrough.

Published in:

International Journal of Geophysics, 2012, p. 1, doi. 10.1155/2012/101545

By:

Minato, Shohei;
Tsuji, Takeshi;
Matsuoka, Toshifumi;
Obana, Koichiro

Publication type:

Article

Detection of hydroacoustic signals on a fiber-optic submarine cable.

Published in:

Scientific Reports, 2021, v. 11, n. 1, p. 1, doi. 10.1038/s41598-021-82093-8

By:

Matsumoto, Hiroyuki;
Araki, Eiichiro;
Kimura, Toshinori;
Fujie, Gou;
Shiraishi, Kazuya;
Tonegawa, Takashi;
Obana, Koichiro;
Arai, Ryuta;
Kaiho, Yuka;
Nakamura, Yasuyuki;
Yokobiki, Takashi;
Kodaira, Shuichi;
Takahashi, Narumi;
Ellwood, Robert;
Yartsev, Victor;
Karrenbach, Martin

Publication type:

Article

Correlation of frontal prism structures and slope failures near the trench axis with shallow megathrust slip at the Japan Trench.

Published in:

Scientific Reports, 2020, v. 10, n. 1, p. 1, doi. 10.1038/s41598-020-68449-6

By:

Nakamura, Yasuyuki;
Fujiwara, Toshiya;
Kodaira, Shuichi;
Miura, Seiichi;
Obana, Koichiro

Publication type:

Article

Earthquake activity in the Torishima Rift and Sofu Seamount, and its relationship to the October 2023 tsunamis in Japan.

Published in:

2025

By:

Obana, Koichiro;
Ito, Aki;
Fujiwara, Toshiya;
Obayashi, Masayuki;
Imai, Kentaro;
Nakamura, Yasuyuki;
Yoshida, Kenta;
Tada, Noriko;
Nakajima, Tomoya;
Matsumoto, Hiroyuki;
Fujie, Gou;
Tanaka, Satoru;
Ono, Shigeaki;
Kodaira, Shuichi

Publication type:

Letter

Precise aftershock activity in the marine source region of the 2024 Noto-Hanto earthquake by rapid response observation using ocean bottom seismometers.

Published in:

2025

By:

Shinohara, Masanao;
Hino, Ryota;
Takahashi, Tsutomu;
Obana, Koichiro;
Kodaira, Shuichi;
Azuma, Ryosuke;
Yamada, Tomoaki;
Akuhara, Takeshi;
Yamashita, Yusuke;
Kurashimo, Eiji;
Murai, Yoshio;
lsse, Takehi;
Nakahigashi, Kazuo;
Baba, Hisatoshi;
Ohta, Yusaku;
Ito, Yoshihiro;
Yakiwara, Hiroshi;
Nakatani, Yukihiro;
Fujie, Gou;
Sato, Toshinori

Publication type:

Letter

Mapping normal faults on the outer slope of the western Kuril Trench based on recent seismic reflection and bathymetric data.

Published in:

Earth, Planets & Space, 2024, v. 76, n. 1, p. 1, doi. 10.1186/s40623-024-02076-7

By:

No, Tetsuo;
Kodaira, Shuichi;
Imai, Kentaro;
Obana, Koichiro;
Fujie, Gou;
Nakamura, Yasuyuki;
Shiraishi, Kazuya;
Miura, Ryo;
Nakanishi, Masao

Publication type:

Article

Remote Hydroacoustic Detection of an Airplane Crash.

Published in:

Pure & Applied Geophysics, 2023, v. 180, n. 4, p. 1343, doi. 10.1007/s00024-022-03117-6

By:

Metz, Dirk;
Obana, Koichiro;
Fukao, Yoshio

Publication type:

Article

Authentic fault models and dispersive tsunami simulations for outer-rise normal earthquakes in the southern Kuril Trench.

Published in:

Earth, Planets & Space, 2024, v. 76, n. 1, p. 1, doi. 10.1186/s40623-024-02046-z

By:

Baba, Toshitaka;
No, Tetsuo;
Obana, Koichiro;
Imai, Kentaro;
Chikasada, Naotaka;
Tanioka, Yuichiro;
Kodaira, Shuichi

Publication type:

Article

S-wave attenuation structure beneath the northern Izu-Bonin arc.

Published in:

2016

By:

Takahashi, Tsutomu;
Obana, Koichiro;
Kodaira, Shuichi

Publication type:

Letter

The Sofu Seamount Submarine Volcano Present in the Source Area of the October 2023 Earthquakes and Tsunamis in Japan.

Published in:

Geophysical Research Letters, 2024, v. 51, n. 19, p. 1, doi. 10.1029/2024GL109766

By:

Fujiwara, Toshiya;
Imai, Kentaro;
Obayashi, Masayuki;
Yoshida, Kenta;
Tada, Noriko;
Obana, Koichiro;
Fujie, Gou;
Ono, Shigeaki;
Kodaira, Shuichi

Publication type:

Article

High‐Density Seismic Refraction Imaging of Plate‐Boundary Structures in the Slow Earthquake Gap Zone off Western Kii Peninsula, Nankai Trough.

Published in:

Geophysical Research Letters, 2021, v. 48, n. 3, p. 1, doi. 10.1029/2020GL089132

By:

Qin, Yanfang;
Fujie, Gou;
Kodaira, Shuichi;
Nakamura, Yasuyuki;
Kaiho, Yuka;
No, Tetsuo;
Obana, Koichiro;
Miura, Seiichi

Publication type:

Article