Source Processes of the March 2007 Singkarak Earthquakes Inferred from Teleseismic Data


  • A. Afnimar Seismological Laboratory, Bandung Institute of Technology
  • Reiji Kobayashi Graduate School of Science and Engineering, Kagoshima University
  • Danny Hilman Natawidjaja Research Center of Geotechnology, Indonesian Institute of Sciences (LIPI)



asperity, source process, shallow rupture, surface displacement, teleseismic data


The rupture processes of two sequentialearthquakes have been inverted from teleseismic data. The first event released a total seismic moment of 7.91018 Nm (Mw 6.5) and the slip distribution shows three asperities, 1.5 m at the shallowside, 0.7 m at the rightsouth-east deep side and 0.5 m atthe north-west deep side. The second event had one asperity with 1.7 m slip and released a seismic moment of 7.51018 Nm (Mw 6.5). In both cases, maximum slip occurred above the hypocenter which was responsible for the surface displacement pattern.


McCaffrey, R., Oblique Plate Convergence, Slip Vectors, and Forearc Deformation, J. Geophys. Res., 97, pp. 8905-8915, 1992.

Sieh, K., &Natawidjaja, D., Neotectonics of the Sumatran

fault, Indonesia, J. Geophys. Res.,105, pp. 28,295-28,326, 2000.

Natawidjaja, D.H., Tohari, A., Subowo, E.& Daryono, M.R., Western Sumatra Earthquakes of March 2007, EERI Special Earthquake Report - May 2007.

Yoshida, S., Koketsu, K.,Shibazaki, B.,Sagiya, T.,Kato, T. & Yoshida, Y., Joint Inversion of Near- and Far-Field Waveforms and Geodetic Data for Rupture Process of the 1995 Kobe Earthquake, J. Phys. Earth, 44, pp. 437-454, 1996.

Goldstein, P., Dodge, D.,Firpo, M. &Minner, L., 2003, SAC2000, Signal Processing and Analysis Tools for Seismologists and Engineers, Invited contribution to The IASPEI International Handbook of Earthquake and Engineering Seismology, Lee,W.H.K.,Kanamori,H., Jennings,P.C.,&Kisslinger, C., eds., Academic Press, London, 2003.

Leonard, M., Earthquake Fault Scaling: Self-Consistent Relating of Rupture Length, Width, Average Displacement, and Moment Release, Bull. Seism. Soc. Am., 100, pp.1971-1988, 2010.

Wessel P. &Smith, W.H.F.,Free Software Helps Map and Display Data,Eos. Trans. Am. Geophys. Union, 85, pp. 159-177, 1995.