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Earthquake source parameters at the sumatran fault zone: Identification of the activated fault plane

  • Research Article
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Central European Journal of Geosciences

Abstract

Fifteen earthquakes (Mw 4.1–6.4) occurring at ten major segments of the Sumatran Fault Zone (SFZ) were analyzed to identify their respective fault planes. The events were relocated in order to assess hypocenter uncertainty. Earthquake source parameters were determined from three-component local waveforms recorded by IRIS-DMC and GEOFON broadband lA networks. Epicentral distances of all stations were less than 10°. Moment tensor solutions of the events were calculated, along with simultaneous determination of centroid position. Joint analysis of hypocenter position, centroid position, and nodal planes produced clear outlines of the Sumatran fault planes. The preferable seismotectonic interpretation is that the events activated the SFZ at a depth of approximately 14–210 km, corresponding to the interplate Sumatran fault boundary. The identification of this seismic fault zone is significant to the investigation of seismic hazards in the region.

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Authors and Affiliations

  1. Physics Department, Faculty Mathematics and Science of ITS Jl, Arif Rahman Hakim I, 60111, Surabaya, Indonesia

    Madlazim Kasmolan, Bagus Jaya Santosa & Widya Utama

  2. Physics Department, Faculty Mathematics and Science of The State University of Surabaya (UNESA) Jl. Ketintang, 60231, Surabaya, Indonesia

    Madlazim Kasmolan

  3. Department of Geological Sciences, University of North Caroline at Chapel Hill Seismology and Volcanology, USA

    Jonathan M. Lees

Authors
  1. Madlazim Kasmolan
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  2. Bagus Jaya Santosa
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  3. Jonathan M. Lees
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  4. Widya Utama
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Kasmolan, M., Santosa, B.J., Lees, J.M. et al. Earthquake source parameters at the sumatran fault zone: Identification of the activated fault plane. Cent. Eur. J. Geosci. 2, 455–474 (2010). https://doi.org/10.2478/v10085-010-0016-5

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  • DOI: https://doi.org/10.2478/v10085-010-0016-5

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