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Preliminary analysis of strong ground motions in the heavily damaged zone in Mashiki Town, Kumamoto, Japan, during the mainshock of the 2016 Kumamoto earthquake (M (sub w) 7.0) observed by a dense seismic array

Yoshiya Hata, Hiroyuki Goto and Masayuki Yoshimi
Preliminary analysis of strong ground motions in the heavily damaged zone in Mashiki Town, Kumamoto, Japan, during the mainshock of the 2016 Kumamoto earthquake (M (sub w) 7.0) observed by a dense seismic array
Seismological Research Letters (September 2016) 87 (5): 1044-1049

Abstract

In this article, the authors make a brief report on the strong ground motions observed in the midst of the heavily damaged zone during the 16 April M (sub w) 7.0 mainshock of the 2016 Kumamoto, Japan, earthquake. The observation was accidentally made by a dense seismic array that was deployed by the authors with the intention of observing aftershocks of the 14 April M (sub w) 6.2 event, which later turned into the foreshock of the M (sub w) 7.0 event. The observed ground motions are characterized by a large-amplitude pulse with an approximate period of 1 s that is predominant in the east-west (EW) components, which is comparable in shape to those observed during the 1994 Northridge and the 1995 Kobe earthquakes. In particular, the observed ground motions exceed the largest observed ground motions during the 1995 Kobe earthquake in terms of spectral accelerations in the 0.5-1.2 s period range. The importance of these records is that this was observed in the midst of a heavily damaged zone, where the ratio of totally collapsed wooden houses, due either to the foreshock or the mainshock, reportedly reached as high as 50% causing significant loss of life. Therefore, the records should be used in future research to reveal how the buildings were damaged, to develop appropriate measures, and to mitigate damages attributed to future large earthquakes.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 87
Serial Issue: 5
Title: Preliminary analysis of strong ground motions in the heavily damaged zone in Mashiki Town, Kumamoto, Japan, during the mainshock of the 2016 Kumamoto earthquake (M (sub w) 7.0) observed by a dense seismic array
Affiliation: Osaka University, Graduate School of Engineering, Suita, Japan
Pages: 1044-1049
Published: 201609
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 19
Accession Number: 2016-083528
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N32°04'60" - N33°10'00", E130°00'00" - E131°16'60"
Secondary Affiliation: Kyoto University, JPN, JapanGeological Survey of Japan, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201640
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