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Source Processes of the March 2007 Singkarak Earthquakes Inferred from Teleseismic Data
Afnimar1, Reiji Kobayashi2 & Danny Hilman Natawidjaja3
1Seismological Laboratory, Bandung Institute of Technology,
Jalan Ganesha 10, Bandung, 40132, Indonesia
2Graduate School of Science and Engineering, Kagoshima University,
1-21-35 Korimoto, Kagoshima 890-0065, Japan
3Research Center of Geotechnology, Indonesian Institute of Sciences,
Komplek LIPI Gd. 70, Jalan Sangkuriang, Bandung, 40135, Indonesia.
Email: afnimar@geoph.itb.ac.id
Abstract. The rupture processes of two sequentialearthquakes have been inverted from teleseismic data. The first event released a total seismic moment of 7.9×1018 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 7.5×1018 Nm (Mw 6.5). In both cases, maximum slip occurred above the hypocenter which was responsible for the surface displacement pattern.
Keywords: asperity; source process;shallow rupture;surface displacement; teleseismic data.
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