Yoshihiro Hiramatsu

Hamamatsu University School of Medicine

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Muneyoshi Furumoto

Kanazawa University

Akihiro Sawada

Jichi Medical University

Ryo Honda

Kanazawa University

Hiroshi Katao

Kyoto University

Masaaki Hamada

Hokuriku Electric Power Company (Japan)

Yoshiaki Ishihara

Idemitsu Kosan (Japan)

Atsushi Sawada

Tokyo Medical and Dental University

Kazutoshi Imanishi

National Institute of Advanced Industrial Science and Technology

Nayuta Matsumoto

Kanazawa University

Masaki Kanao

National Institute of Polar Research

Cooperative Institutions

The University of Tokyo

Kyoto University

Association for the Development of Earthquake Prediction

Kanazawa University

Tohoku University

Nagoya University

Graduate School USA

National Research Institute for Earth Science and Disaster Resilience

Hokkaido University

Earthquake Engineering Research Institute

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Coseismic uplift and fault model of marine active faults in 1729 AD revealed by fossilized intertidal sessile organisms along the northern coast of the Noto Peninsula, central Japan

2015 AGU Fall Meeting (2015)

Masaaki Hamada Yoshihiro Hiramatsu Masayuki Oda Hiroshi Yamaguchi

Peninsula

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Anisotropy of S wave velocity in the lowermost mantle using broad-band data recorded at Syowa in Antarctica

AGUFM (2003)

Yusuke Usui Yoshihiro Hiramatsu Muneyoshi Furumoto Masaki Kanao

Broad band

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Spatial distribution of similar aftershocks of a large inland earthquake, the 2000 Western Tottori earthquake, in Japan

Earth Planets and Space (2013)

Misaki Hayashi Yoshihiro Hiramatsu

We detected similar aftershocks of the 2000 Western Tottori earthquake and we have examined their spatial distribution on the source fault. Many similar aftershocks are distributed in the northern part of the source fault, but few in the southern part. Specifically, similar aftershocks on the source fault are located outside of the asperity. The cumulative slip estimated from the similar aftershocks is 0.4–2.4 cm. The largest one is found at the edge of the major asperity. We observe that shallower events show a larger cumulative slip than deeper events. Large cumulative slip in the shallow depth in the northern part is coincident with the geodetic observation of afterslip. These facts suggest that similar aftershocks can provide information related to afterslip. However, the slip velocity estimated from both the slip and the recurrence interval of the similar aftershocks shows no distinct distribution.

Asperity (geotechnical engineering)

10.5047/eps.2013.09.002

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Seismic anisotropy and velocity discontinuity in the lowermost mantle beneath the Antarctic Ocean

AGU Fall Meeting Abstracts (2005)

Yusuke Usui Yoshihiro Hiramatsu Muneyoshi Furumoto

Discontinuity (linguistics)

Seismic anisotropy

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Scaling law between corner frequency and seismic moment of microearthquakes: Is the breakdown of the cube law a nature of earthquakes?

Geophysical Research Letters (2002)

Yoshihiro Hiramatsu Hiroshi Yamanaka K. Tadokoro K. Nishigami Shiro Ohmi

The corner frequency, f C , and the seismic moment, M 0 , of microearthquakes (local magnitude from −1.3 to 1.3) are estimated from the records of sensors located at an 1800‐m‐deep borehole at the Nojima fault, central Japan. The digital waveforms of each event are recorded with two different sampling rates, 10 kHz and 100 Hz. The source parameters estimated from high‐sampling data satisfy a relationship of M 0 ∝ f C −3 , corresponding to a constant stress drop law, while those calculated from low‐sampling data follow a relationship of M 0 ∝ f C −4 . A lack of high frequency components in the 100 Hz sampling data seem to be obvious, indicating that the value of f C and M 0 are incorrectly estimated and the relationship of M 0 ∝ f C −4 is an artifact caused by the limited frequency band of these data. The scaling relationship of M 0 ∝ f C −3 is, thus, also valid for microearthquakes, and the breakdown of the constant stress drop law, reported in the literature, is not well founded.

Seismic moment

Cube root

10.1029/2001gl013894

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Citations (49)

Observation of Infrasonic/Acoustic/Seismic Waves Induced by Hypersonic Reentry of Hayabusa

Asteroids, Comets, Meteors 2012 (2012)

Masa‐yuki Yamamoto Y. Ishihara Yoshihiro Hiramatsu Muneyoshi Furumoto Kenichi Fujita

Reentry

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temporal change in Coda Q⁻¹ in the Hida Region, central Japan

Geophysical Research Letters (1992)

Yoshihiro Hiramatsu Masataka Ando Fumiaki Takeuchi

Coda Q −1 was determined from the decay rate of coda waves in the bands of 1.5 to 24 Hz in the Hida region, central Japan. The data consist of routinely made observations for events from 1985 to 1991 (367 events), with magnitudes less than 4.0 and depths shallower than 30 km. We found a systematic temporal variation in coda Q −1 . Coda Q −1 increased with time in the volcanic area. The interpretation of the systematic temporal change in coda Q −1 in the Hida region is that aseismic fractures due to magma accumulation can modify the scattering environment and consequently the coda Q −1 estimates.

Coda

10.1029/92gl01203

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Seismic anisotropy near source region in subduction zones around Japan

Physics of The Earth and Planetary Interiors (1996)

Yoshihiro Hiramatsu Masataka Ando

Seismic anisotropy

10.1016/0031-9201(95)03119-7

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Citations (17)

Microseismic Observation in the Vicinity of Hakusan Volcano

Zisin (Journal of the Seismological Society of Japan 2nd ser ) (2003)

Naoki Takahashi Yoshihiro Hiramatsu Muneyoshi Furumoto Manabu Miyake Naoshi Hirata

Microseism

10.4294/zisin1948.56.1_89

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Linking the spatiotemporal distribution of static stress drops to source faults in a fluid-driven earthquake swarm, northeastern Noto Peninsula, central Japan

Research Square (Research Square) (2024)

Mitsuteru Fukuoka Yoshihiro Hiramatsu Takuji Yamada

Abstract We investigated stress drops during an earthquake swarm in northeastern Noto Peninsula, central Japan, which is characterized by ongoing seismic activity in four clusters. We focused on the spatiotemporal distribution of the static stress drop and its relationship with the source faults of the earthquake swarm. Employing the empirical Green’s function method, we estimated static stress drops for 90 earthquakes of MJMA 3.0–5.4. We obtained logarithmic mean stress drops of 13 MPa and 19 MPa from P-wave and S-wave analyses, respectively, typical values for crustal earthquakes. We comprehensively analyzed the spatiotemporal distribution of static stress drops in the northern cluster due to the abundance of available data and clarity of fault structures there. We observed larger static stress drops for earthquakes along shallow portions of the source faults, as defined by the hypocentral distribution during a given period. Conversely, we observed smaller static stress drops for earthquakes at medial depths along the faults. These results suggest higher fault strength at shallower depths along the faults and reduced fault strength at medial depths. We attribute the high fault strength at shallow depths to low pore fluid pressure after only limited fluid diffusion near the fault terminus. In contrast, we attribute the reduction in fault strength at greater depths to high pore fluid pressure within the fault following penetration by migrating fluids.

Fluid pressure

10.21203/rs.3.rs-4200967/v1

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