N
Naoshi Hirata
Researcher at University of Tokyo
Publications - 175
Citations - 5351
Naoshi Hirata is an academic researcher from University of Tokyo. The author has contributed to research in topics: Aftershock & Hypocenter. The author has an hindex of 37, co-authored 175 publications receiving 4748 citations. Previous affiliations of Naoshi Hirata include Science Council of Japan & Chiba University.
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Propagation of slow slip leading up to the 2011 M(w) 9.0 Tohoku-Oki earthquake.
Aitaro Kato,Kazushige Obara,Toshihiro Igarashi,Hiroshi Tsuruoka,Shigeki Nakagawa,Naoshi Hirata +5 more
TL;DR: The time history of quasi-static slip along the plate interface, based on small repeating earthquakes that were part of the migrating seismicity, suggests that two sequences involved slow-slip transients propagating toward the initial rupture point.
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Continental Crust, Crustal Underplating, and Low- Q Upper Mantle Beneath an Oceanic Island Arc
Kiyoshi Suyehiro,Narumi Takahashi,Yoshiro Ariie,Yasutaka Yokoi,Ryota Hino,Masanao Shinohara,Toshihiko Kanazawa,Naoshi Hirata,Hidekazu Tokuyama,Asahiko Taira +9 more
TL;DR: A detailed structural model of the crust, subducting slab, and underlying upper mantle across the northern Izu-Ogasawara (Bonin) island arc system is derived from a marine seismic reflection and ocean bottom seismographic refraction survey and subsequent forward modeling combined with tomographic inversion.
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Maximum-likelihood estimation of hypocenter with origin time eliminated using nonlinear inversion technique
TL;DR: In this paper, a new algorithm is applied to inverting arrival time data for hypocenter location, which incorporates both observed and prior data from a Bayesian point of view, and the posterior pdf of hypocenter parameters is integrated over the whole range of the origin time.
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Variations of fluid pressure within the subducting oceanic crust and slow earthquakes
Aitaro Kato,Takashi Iidaka,Ryoya Ikuta,Yasuhiro Yoshida,Kei Katsumata,Takaya Iwasaki,Shin'ichi Sakai,Clifford H. Thurber,Noriko Tsumura,Koshun Yamaoka,Toshiki Watanabe,Takahiro Kunitomo,Fumihito Yamazaki,Makoto Okubo,Sadaomi Suzuki,Naoshi Hirata +15 more
TL;DR: In this article, fine-scale variations of seismic velocities and converted teleseismic waves reveal the presence of zones of high-pressure fluids released by progressive metamorphic dehydration reactions in the subducting Philippine Sea plate in Tokai district, Japan.
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Structural factors controlling the rupture process of a megathrust earthquake at the Nankai trough seismogenic zone
Shuichi Kodaira,Eiji Kurashimo,Jin-Oh Park,Narumi Takahashi,Ayako Nakanishi,Seiichi Miura,Takaya Iwasaki,Naoshi Hirata,Kosuke Ito,Yoshiyuki Kaneda +9 more
TL;DR: In this paper, a subducting seamount at the centre of the proposed rupture zone with dimensions of 13 km thick by 50 km wide at 10 km depth was found and the seismic velocity image also showed that the seamount is now colliding with the Japanese island arc crust.