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Microearthquakes along the back-arc spreading system in the eastern Bismarck Sea

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Abstract

OBS’s were deployed for 26 to 29 days in the eastern Bismarck Sea to investigate the back-arc spreading. Hypocenters of 186 shallow earthquakes were determined using P- and S-waves from at least five stations. In the western survey area, a transform fault zone is marked by a linear micro-earthquake activity striking N65°W and less than 5 km wide. The predominant type of their focal mechanisms is strike-slip. In the eastern area, several intermittent zones of micro-earthquakes and their strike-slip type focal mechanisms suggest the location of short-length transform faults separating en-echelon spreading ridges.

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Authors and Affiliations

  1. National Research Center for Disaster Prevention, Tennodai 3-1, Sakura, 305, Niihari, lbaraki, Japan

    T. Eguchi, Y. Fu**awa & M. Ukawa

  2. Port Moresby Geophysical Observatory, Box 323, Port Moresby, Papua New Guinea

    L. Bibot

Authors
  1. T. Eguchi
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  2. Y. Fu**awa
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  3. M. Ukawa
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  4. L. Bibot
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Eguchi, T., Fu**awa, Y., Ukawa, M. et al. Microearthquakes along the back-arc spreading system in the eastern Bismarck Sea. Geo-Marine Letters 6, 235–240 (1986). https://doi.org/10.1007/BF02239585

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  • DOI: https://doi.org/10.1007/BF02239585

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