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

Madlazim Kasmolan
  • Physics Department, Faculty Mathematics and Science of ITS Jl, Arif Rahman Hakim I, 60111, Surabaya, Indonesia
  • Physics Department, Faculty Mathematics and Science of The State University of Surabaya (UNESA) Jl. Ketintang, 60231, Surabaya, Indonesia
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/ Bagus Santosa / Jonathan Lees / Widya Utama
Published Online: 2010-12-01 | DOI: https://doi.org/10.2478/v10085-010-0016-5


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 Zone; three-component local waveform inversion; earthquake source parameters; fault plane

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About the article

Published Online: 2010-12-01

Published in Print: 2010-12-01

Citation Information: Open Geosciences, Volume 2, Issue 4, Pages 455–474, ISSN (Online) 2391-5447, DOI: https://doi.org/10.2478/v10085-010-0016-5.

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