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Scale-dependence of seismic energy-to-moment ratio for strike-slip earthquakes in Japan

Izutani, Yasuo and Kanamori, Hiroo (2001) Scale-dependence of seismic energy-to-moment ratio for strike-slip earthquakes in Japan. Geophysical Research Letters, 28 (20). pp. 4007-4010. ISSN 0094-8276. doi:10.1029/2001GL013402.

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We analyzed four pairs of a large (M_w ≈ 6) and a small (M_w ≈ 3.5 to 4) shallow strike-slip earthquakes to investigate the scale-dependence of the seismic energy-to-moment ratio, an important macroscopic parameter which reflects the basic physical process of seismic slip. These earthquakes occurred in the south-western part of Japan, and high-quality close-in records (epicentral distance < 50 km) are available for both the small and large earthquakes. The paired events have almost the same focal mechanism and hypocenter location. We used the spectral ratio of the paired events in order to remove the effects of attenuation along the wave propagation path and the station site response. We then estimated the seismic energy from the source spectra estimated from the spectral ratio. The energy-to-moment ratio increases with the earthquake size. This scale-dependence is very similar to that found earlier for earthquakes in Southern California.

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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2001 American Geophysical Union. Received May 7, 2001; accepted July 31, 2001. Paper number 2001GLO13402. We thank T. A. Matsuzawa and M. Takeo who kindly sent us their unpublished data on E_R/M_0. Accelerograms from K-NET and KIK-NET stations operated by the National Research Institute for Earth Science and Disaster Prevention, Japan, are used in this study. Y. I. was supported by the scholarship from the Ministry of Education, Culture, Sports, Science and Technology, Japan. This research was partially supported by NSF Cooperative Agreement EAR-9909371. This is contribution 8807 of the Caltech Division of Geological and Planetary Sciences.
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Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences8807
Issue or Number:20
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ID Code:51639
Deposited By: Ruth Sustaita
Deposited On:12 Nov 2014 21:46
Last Modified:10 Nov 2021 19:13

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