Azusa Shito

Okayama University of Science

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Satoshi Matsumoto

Kyushu University

Hiroshi Shimizu

Japan Organization for Metals and Energy Security (Japan)

Hiroko Sugioka

Kobe University

Aki Ito

Japan Agency for Marine-Earth Science and Technology

Hajime Shiobara

The University of Tokyo

Koki Aizawa

Kyushu University

Takeshi Matsushima

Kyushu University

T. Kanazawa

Association for the Development of Earthquake Prediction

Kazunari Uchida

Kyushu University

Makoto Uyeshima

The University of Tokyo

Cooperative Institutions

The University of Tokyo

Association for the Development of Earthquake Prediction

Kyoto University

Earthquake Engineering Research Institute

Graduate School USA

Tohoku University

Hokkaido University

Institute of Seismology

Nagoya University

Kyushu University

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Completion of three-year observation by BBOBS and OBEM arrays probing the stagnant slab

AGUFM (2008)

K. Baba Hajime Shiobara T. Goto Hiroko Sugioka Takafumi Kasaya

Slab

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Anisotropy in the Northwest Pacific oceanic lithosphere inferred from Po/So waves

Japan Geoscience Union (2016)

Azusa Shito Daisuke Suetsugu Takashi Furumura Hajime Shiobara Takehi Isse

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Q in the Mantle Wedge beneath the Philippine Sea

AGUFM (2003)

Azusa Shito S. Karato J. Park

Wedge (geometry)

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Towards Mapping the Three-Dimensional Distribution of Water in the Upper Mantle from Velocity and Attenuation Tomography

Geophysical monograph (2011)

Azusa Shito Shun‐ichiro Karato Kyoko N. Matsukage Yu Nishihara

This chapter contains sections titled: Introduction Conversion of Seismological Data to Geophysical Parameters Inversion Discussion Appendi X: Some Notes on Partial Derivatives Aij

Seismic Tomography

10.1029/168gm17

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Citations (41)

Origin of Seismic Heterogeneity in the Upper Mantle beneath the Northern Philippine Sea

Azusa Shito

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Seismic structure of the upper mantle beneath the Philippine Sea from seafloor and land observation: Implications for mantle convection and magma genesis in the Izu–Bonin–Mariana subduction zone

Earth and Planetary Science Letters (2009)

Takehi Isse Hajime Shiobara Yoshihiko Tamura Daisuke Suetsugu Kazunori Yoshizawa

Seafloor Spreading

Slab

Volcanic arc

10.1016/j.epsl.2008.11.032

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Citations (41)

Seismic wave attenuation and local depth of seismogenic layer in the crust beneath Kyushu, Japan

Japan Geoscience Union (2017)

Azusa Shito Satoshi Matsumoto Takahiro Ohkura

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Urgent Joint Seismic Observation Data of the 2016 Kumamoto Earthquakes

Zisin (Journal of the Seismological Society of Japan 2nd ser ) (2020)

Azusa Shito Ayaho Mitsuoka Satoshi Matsumoto Takeshi Matsushima Koki Aizawa

10.4294/zisin.2019-11

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Upper mantle structure beneath the Northern Philippine Sea region

AGU Fall Meeting Abstracts (2002)

Azusa Shito Takuo Shibutani

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Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: Observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan

Research Square (Research Square) (2020)

Koki Aizawa Shinichi Takakura Hisafumi Asaue Katsuaki Koike Ryokei Yoshimura

Abstract Crustal earthquake ruptures tend to initiate near fluid-rich zones. However, it is relatively unknown whether fluid-rich zones can further promote or arrest these ruptures. We image the electrical resistivity structure around the focal area of the 2016 Kumamoto earthquake sequence by using 200 sites broad-band magnetotelluric data, and discuss its quantitative relationship to earthquake initiation, growth, and arrest processes. The ruptures that initiated along the outer edge of the low-resistivity fluid-rich zones (<30 Ωm) tended to become large earthquakes, whereas those that initiated either distal to or within the fluid-rich zones did not. The ruptures were arrested by high-temperature (>400°C) fluid-rich zones, whereas shallower low-temperature (200–400°C) fluid-rich zones either promoted or arrested the ruptures. These results suggest that the distribution of mid-crustal fluids contributes to the initiation, growth, and arrest of crustal earthquakes. The pre-failure pressure/temperature gradient (spatial difference) of the pore fluids may contribute to the rupture initiation, propagation, and arrest.

Magnetotellurics

Fluid pressure

Seismic velocity

10.21203/rs.3.rs-70730/v2

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