Crustal Structure in the Western Part of Japan Derived from the Observation of the First and Second Kurayosi and Hanabusa Explosions

Hashizume, Michio; Kawamoto, Osamu; Asano, Shûzô; Muramatu, Ikuei; Asada, Toshi; Tamaki, Itsuo; Murauchi, Sadanori

doi:10.4294/zisin1948.19.2_125

Cited by 11 publications

(14 citation statements)

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“…[19] The depth of the Moho discontinuity in the Tottori region obtained from the explosion seismology is about 38 km [e.g., Hashizume et al, 1966]. Thus the DLF earthquakes are located around or just above the Moho discontinuity.…”

Section: Discussionmentioning

confidence: 99%

Deep low‐frequency earthquakes beneath the focal region of the Mw 6.7 2000 Western Tottori earthquake

Ohmi

Obara

2002

Geophysical Research Letters

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an Mw = 6.7 crustal earthquake occurred in western Tottori prefecture, southwest Japan. Beneath the focal region of the earthquake, deep lowfrequency (DLF) earthquakes were observed at depths of around 30 km. Five DLF earthquakes were detected within 3 years before the mainshock and more than 60 DLF earthquakes were observed during the 13 months after the mainshock. We investigated the focal mechanism of the DLF earthquake that occurred 9 hours before the mainshock, using amplitude ratios of the S-waves to the P-waves and polarization patterns of the S-waves. Both analyses indicated that a single-force source mechanism is more preferable than a double-couple source mechanism, which suggests the transport of fluid such as water or magma. This event is probably another example of DLF earthquakes that occur beneath active fault zones.

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Section: Discussionmentioning

confidence: 99%

Deep low‐frequency earthquakes beneath the focal region of the Mw 6.7 2000 Western Tottori earthquake

Ohmi

Obara

2002

Geophysical Research Letters

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“…Precise values of velocities for the layers in the crust not only beneath the Tohoku District but also beneath the southern part of Hokkaido, the Kanto District, the central and the western parts of Japan have been derived from explosion seismic observations by HOTTA et al (1964), HASHIZUME et al (1966, SASAKI et al (1970), AOKI et al (1972), OKADA et al (1973), YOSHII et al (1974), and ASANO et al (1979. These results suggest that although there is a large lateral variation of the thickness of these layers, variation of velocity is small at least beneath the land area of Japan.…”

Section: Introductionmentioning

confidence: 98%

Two-dimensional depth structure of the crust beneath the Tohoku District,the northeastern Japan arc Part I. Method and Conrad discontinuity.

1982

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A new technique for determining the three-dimensional seismic velocity structure of a crust is proposed.The principle of the technique is to relate travel time anomalies only to those thickness anomalies of the granitic and the basaltic layers, whose seismic velocities have been shown to be almost constant in the lateral direction at least beneath the land area of Japan. We determine the lateral variations of the depth of the Conrad discontinuity beneath the Tohoku District, the northeastern part of Honshu, Japan by applying the technique to arrival time data from local earthquakes. The results show that the Conrad is deep beneath the central part of the Tohoku District and becomes shallower toward both the eastern and western coast lines. They also show that the Conrad becomes deeper to the north and is located at a depth ranging from 14 to 18km.The resulting Conrad depth at the western part of the profile along the Kesennuma-Oga is consistent with that derived from explosion seismic experiment.However, our result in the eastern part of the profile suggests that the Conrad is located at a depth of about 14km, which is deeper by 6km than that derived from explosion seismic experiment.

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“…The crustal structure in the Kinki district has been investigated by the Kurayosi-Hanabusa explosions (K-H explosions) which had been detonated three times at Kurayosi and twice at Hanabusa since 1963 (RESEARCH GROUP FOR EX- PLOSION SEISMOLOGY, 1966HASHIZUME et al, 1966;SASAKI et al, 1970;YOSHII et al, 1974). Figure 1 shows the shot points and the profile.…”

Section: Introductionmentioning

confidence: 99%

Pn velocity and moho-offset at the west of Lake Biwa in the Kinki district, Japan.

Hurukawa

1983

J,Phys,Earth

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Crustal Structure in the Western Part of Japan Derived from the Observation of the First and Second Kurayosi and Hanabusa Explosions

Cited by 11 publications

References 0 publications

Deep low‐frequency earthquakes beneath the focal region of the Mw 6.7 2000 Western Tottori earthquake

Deep low‐frequency earthquakes beneath the focal region of the Mw 6.7 2000 Western Tottori earthquake

Two-dimensional depth structure of the crust beneath the Tohoku District,the northeastern Japan arc Part I. Method and Conrad discontinuity.

Pn velocity and moho-offset at the west of Lake Biwa in the Kinki district, Japan.

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