Source Parameters of the 1948 Fukui Earthquake Inferred from Low-gain Strong-motion Records

• KIKUCHI Masayuki

  Earthquake Research Institute, University of Tokyo

• NAKAMURA Misao

  Information Service for Disaster Prevention

• YAMADA Makoto

  Advanced Research Institute for Science and Engineering, Waseda University

• FUSHIMI Minoru

  The Kansai Electric Power Co., Inc.

• TATSUMI Yoshiki

  The Kansai Electric Power Co., Inc.

• YOSHIKAWA Kazumitsu

  Seismological and Volcanological Department, Japan Meteorological Agency

Bibliographic Information

Other Title

• 1948年福井地震の震源パラメーター
• 1948年福井地震の震源パラメーター--1倍強震計記録の解析
• 1948ネン フクイ ジシン ノ シンゲン パラメーター 1バイ キョウシンケイ キロク ノ カイセキ
• ―1倍強震計記録の解析―

Abstract

Seismograms in 1940's are usually recorded on smoked paper. Owing to the recent development of photocopy and image processing techniques, we can reconstruct feasible waveform data by tracing, digitizing, and correcting the arc effect due to inclined lever. Using low gain strong motion data at several observatories of Japan Meteorological Agency and Kyoto University, we investigate the source process of the 1948 Fukui earthquake. In the waveform inversion we consider the uncertainty of instrumental constants (pendulum period, magnification and damping constant), timing, and chart speed. The rupture process is then modeled by moment-rate functions at grid points on a fault plane with a spacing of 10km. It is shown that a rupture initiated at a depth of about 10km, moved upward, and then propagated mainly to the south. The rupture front velocity was about 2.5km/s. The largest moment release occurred around 10km south of the epicenter. The main source parameters are: strike=170±50°, dip=70±5°, rake=-10±10°, seismic moment=2.1×10¹⁹Nm, M_w=6.8, fault area=30×10km², average dislocation=2.3m, stress drop=10MPa.

Journal

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

  Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 52 (1), 121-128, 1999

  SEISMOLOGICAL SOCIETY OF JAPAN

Keywords

• Source parameter
• Historical seismogram
• Fukui earthquake
• Strong motion record

Details

• CRID: 1390282679283755520
• NII Article ID: 10004680227
• NII Article ID: 10004679833
• NII Book ID: AN00305741
• DOI: 10.4294/zisin1948.52.1_121
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• NDL BIB ID: 4824369
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4824369
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/52/1/52_1_121/_pdf
• Data Source:
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  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed