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Seismicity and waveforms of the microearthquakes before and after the Shizuoka-Seibu earthquake, central Japan

Mizuho Ishida and Masakazu Ohtake
Seismicity and waveforms of the microearthquakes before and after the Shizuoka-Seibu earthquake, central Japan
Bulletin of the Seismological Society of America (April 1984) 74 (2): 605-620

Abstract

Investigating the Shizuoka-Seibu earthquake (M = 2.8, 16 January 1981) we found evidence that suggests high stress conditions for the foreshock period. The source dimension of the main shock was roughly estimated to be about 0.5X0.2 km (super 2) . The m value of the Ishimoto-Iida's formula was 1.87 for foreshocks and 2.37 for aftershocks. Waveforms of the foreshocks, main shock, and aftershocks were similar. However, the amplitude ratio of the low (0.9 to 0.8 Hz) to high (3.5 to 10 Hz) frequency band was different between the foreshocks and aftershocks. The ratio for the foreshocks was lower than that for the aftershocks. The Shizuoka-Seibu sequence included a larger number of foreshocks (70) compared to aftershocks (43). This characteristic, in contrast with large earthquakes, was found common to small-sized earthquakes occurring in the neighborhood areas. These observations can be interpreted based on the asperity model.--Modified journal abstract.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 74
Serial Issue: 2
Title: Seismicity and waveforms of the microearthquakes before and after the Shizuoka-Seibu earthquake, central Japan
Affiliation: Carnegie Inst. Washington, Dep. Terr. Magn., Washington, DC, United States
Pages: 605-620
Published: 198404
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 16
Accession Number: 1984-049081
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps, 2 tables
N34°45'00" - N35°40'00", E137°19'60" - E139°00'00"
Secondary Affiliation: Natl. Res. Cent. Disaster Prev., JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1984
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