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Volume 57 Supplement 4

Special Issue: Special Section for the 2004 off the Kii peninsula earthquakes (2)

Source process of the 1923 Kanto earthquake inferred from historical geodetic, teleseismic, and strong motion data

Earth, Planets and Space volume 57, pages 261–270 (2005)Cite this article

Abstract

The historical geodetic and teleseismic data are jointly inverted for the rupture process of the 1923 Kanto earthquake together with the strong motion data recently discovered. The resultant slip distribution shows two asperities (areas of large slips) on the fault plane with a total seismic moment of 1.1 ⊙ 1021 Nm (Mw 8.0). The asperity in the shallow central portion of the fault is larger with maximum slip of approximately 10 m than the one in the hypocentral region. The recovered slip functions indicate that the initial slip was abrupt in the hypocentral asperity, though it was gradual in the larger asperity. The major discrepancies between the observations and synthetics are attributed to volcanic activities and the 3-D structure of the Kanto Basin. We compare the slip and aftershock distributions and also discuss the relation of the asperities to silent earthquakes.

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Authors and Affiliations

  1. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Reiji Kobayashi & Kazuki Koketsu

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  1. Reiji Kobayashi
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  2. Kazuki Koketsu
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Correspondence to Reiji Kobayashi.

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Kobayashi, R., Koketsu, K. Source process of the 1923 Kanto earthquake inferred from historical geodetic, teleseismic, and strong motion data. Earth Planet Sp 57, 261–270 (2005). https://doi.org/10.1186/BF03352562

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  • DOI: https://doi.org/10.1186/BF03352562

Key words

  • The 1923 Kanto earthquake
  • source process
  • asperity