Explosion Seismic Studies of the Underground Structure in the Matsushiro Earthquake Swarm Area

Asano, Shûzô; Kubota, Susumu; Okada, Hiroshi; Nogoshi, Mitsuo; Suzuki, Hiroki; Ichikawa, Kanenori; Watanabe, Hideo

doi:10.4294/jpe1952.17.77

Cited by 24 publications

(21 citation statements)

References 2 publications

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“…All events located in this paper occurred in the upper part of the layer of VP= 6.1 km/s; similar phenomena were reported for the Matsushiro Earthquake Swarm Area (ASANO et al, 1969), the Tohoku District (TAKAGI et al, 1977), and the Izu Peninsula (ASANO et al, 1982). MFH: Magnitude determined by FMO (1982).…”

Section: Seismic Activities and Focal Parameters For Shallow Eventssupporting

confidence: 84%

Local earthquake swarm occurring in South Kyushu.

Kakuta

1984

J,Phys,Earth

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Section: Seismic Activities and Focal Parameters For Shallow Eventssupporting

confidence: 84%

Local earthquake swarm occurring in South Kyushu.

Kakuta

1984

J,Phys,Earth

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“…This profile crosses the Matsushiro earthquake swarm area and this forms an extensional profile of the 1957 experiment by ASANO et al (1969). We found a large buried fault in the middle of the profile, which is probably a reverse fault.…”

Section: Introductionsupporting

confidence: 54%

Detailed Crustal Structure in the Izu Peninsula as Revealed by Explosion Seismic Experiments

et al. 1986

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Under the Fourth Earthquake Prediction Project of Japan starting from 1979, the Research Group for Explosion Seismology conducted a series of explosion seismic experiments to reveal detailed structure of the shallow crust. In this paper, results from two experiments in the Izu Peninsula are shown. Structure of the shallow crust in the peninsula is very complex and is quite valuable for the other geophysical and geological investigations. For example, time terms of the basement layer show a good correlation with Bouguer anomalies when we assume a reduction density of about 2.7 g/cm3. A layer with a velocity of about 4.1 km/s observed in the whole Izu Peninsula may correspond to the Yugashima Group. Our structural models are also useful for discussion of abnormal crustal uplift and seismic activities observed around the Izu Peninsula in recent years. We believe that the middle-size seismic experiment like these Izu experiments may be the most appropriate one in geologically complex regions such as Japan.

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“…This kind of experiment was conducted in the Matsushiro Earthquake Swarm area, Central Japan in 1967 for the first time (ASANO et al, 1969a(ASANO et al, , b, c, 1973. The information on the crustal structure in the region around Matsushiro derived from explosion seismic data was really valuable to investigate into the real cause of earthquake swarm.…”

Section: Discussionmentioning

confidence: 99%

“…The detailed studies on the crustal structure by the seismic refraction method in the Matsushiro Earthquake Swarm area, Central Japan in 1967 give one example. The results of the detailed studies showed that earthquakes took place within the granitic layer, a fault-like structure or an offset in the upper boundary of the granitic layer was derived near the most active area, the anomalous portion with low velocity and low Q was found in the granitic layer within the most active area and so forth (ASANO et al, 1969a(ASANO et al, , b, c, 1973OKADA et al, 1970;SUZUKI, 1972).…”

mentioning

confidence: 99%