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Revisiting the three M~7 Miyagi-oki earthquakes in the 1930s: possible seismogenic slip on asperities that were re-ruptured during the 1978 M=7.4 Miyagi-oki earthquake

Earth, Planets and Space volume 58, pages 1587–1592 (2006)Cite this article

Abstract

Hypocenters of main shocks and aftershocks of the 1933 M=7.1, 1936 M=7.4, 1937 M=7.1 and 1978 M=7.4 Miyagi-oki earthquakes are relocated using S-P times reported in the Seismological Bulletin of the Japan Meteorological Agency (JMA) and those re-read from original smoked-paper seismograms observed at the Mizusawa station of the National Astronomical Observatory of Japan (NAOJ) and the Mukaiyama station of Tohoku University. In order to reduce the error caused by inaccuracies of the arrival times and the small number of seismic observation stations, we determined the hypocenters by using a grid search method that assumed that the events occurred at the boundary between the subducting Pacific plate and the overriding plate. The main shock epicenters of these four earthquakes were determined to be close to each other, while the distributions of their aftershocks seem to disperse on the upper boundary of the Pacific plate. These distributions show that aftershock areas of the 1933, 1936 and 1937 events partly overlap with that of the 1978 event and occupy its easternmost, central and westernmost portions, respectively. This result suggests that the 1933, 1936 and 1937 events possibly ruptured a part of the source area of the 1978 event, i.e., its eastern, central and western portions, respectively.

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Authors and Affiliations

  1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan

    Norihito Umino, Toshio Kono, Tomomi Okada, Junichi Nakajima, Toru Matsuzawa, Naoki Uchida & Akira Hasegawa

  2. National Astronomical Observatory of Japan, Hoshigaoka 2-12, Mizusawa, Iwate, 023-0861, Japan

    Yoshiaki Tamura

  3. Sendai District Meteorological Observatory, Gorin 1-3-15, Miyagino-ku, Sendai, Miyagi, 983-0842, Japan

    Gen Aoki

Authors
  1. Norihito Umino
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  2. Toshio Kono
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  3. Tomomi Okada
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  4. Junichi Nakajima
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  5. Toru Matsuzawa
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  6. Naoki Uchida
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  7. Akira Hasegawa
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  8. Yoshiaki Tamura
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  9. Gen Aoki
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Corresponding author

Correspondence to Norihito Umino.

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Umino, N., Kono, T., Okada, T. et al. Revisiting the three M~7 Miyagi-oki earthquakes in the 1930s: possible seismogenic slip on asperities that were re-ruptured during the 1978 M=7.4 Miyagi-oki earthquake. Earth Planet Sp 58, 1587–1592 (2006). https://doi.org/10.1186/BF03352666

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  • DOI: https://doi.org/10.1186/BF03352666

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