Central European Journal of Geosciences

, Volume 2, Issue 4, pp 455–474

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

Authors

  • Madlazim Kasmolan
    • Physics DepartmentFaculty Mathematics and Science of ITS Jl
    • Physics DepartmentFaculty Mathematics and Science of The State University of Surabaya (UNESA) Jl. Ketintang
  • Bagus Jaya Santosa
    • Physics DepartmentFaculty Mathematics and Science of ITS Jl
  • Jonathan M. Lees
    • Department of Geological SciencesUniversity of North Caroline at Chapel Hill Seismology and Volcanology
  • Widya Utama
    • Physics DepartmentFaculty Mathematics and Science of ITS Jl
Research Article

DOI: 10.2478/v10085-010-0016-5

Cite this article as:
Kasmolan, M., Santosa, B.J., Lees, J.M. et al. Cent. Eur. J. Geosci. (2010) 2: 455. doi:10.2478/v10085-010-0016-5
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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.

Keywords

Sumatran Fault Zonethree-component local waveform inversionearthquake source parametersfault plane

Copyright information

© Springer-Verlag 2010