Temporal Seismic Observation and Preliminary Hypocenter Determination of Aftershocks of the 2003 Bam Earthquake, Southeastern Iran

Accession number;05A0561593
Title;Temporal Seismic Observation and Preliminary Hypocenter Determination of Aftershocks of the 2003 Bam Earthquake, Southeastern Iran
Author;SUZUKI SADAOMI(Kyushu Univ., Fukuoka, Jpn)   MAHMOUD FATEMI AGHDA SAYYED(Natural Disaster Res. Inst. Iran, Tehran, Irn)   NAKAMURA TAKESHI(Kyushu Univ., Fukuoka, Jpn)   MATSUSHIMA TAKESHI(Kyushu Univ., Shimabara, Jpn)   ITO YOSHIHIRO(National Res. Inst. Earth Sci. And Disaster Prevention, Tsukuba, Jpn)   SADEGHI HOSSEIN(Ferdowsi Univ. Iran, Mashhad, Irn)   MALEKI MEHDI(Natural Disaster Res. Inst. Iran, Tehran, Irn)   GANDOMI ARASH JAFAR(Kyushu Univ., Fukuoka, Jpn)   HOSSEINI SAYYED KEIVAN(Kyushu Univ., Fukuoka, Jpn)   
Journal Title;Bulletin of the Earthquake Research Institute, University of Tokyo
Journal Code:S0002A
ISSN:0040-8972
VOL.79;NO.3/4;PAGE.37-45(2005)
Figure&Table&Reference;FIG.7, TBL.3, REF.16
Pub. Country;Japan
Language;English
Abstract;We investigate the hypocenter distribution of aftershocks of the 26 December, 2003, Bam earthquake Mw 6.5 using a temporal seismic network installed for 1 month from 6 February, 2004. Preliminary hypocenters were determined using automatic phase-picking and calculating software. The epicenters are distributed linearly about 20 km in length parallel 3.5 km west of the Bam fault, and extend from the south of Bam city to the heavily damaged area of eastern Bam city including Arg-e-Bam. The hypocenters are distributed vertically or slightly leaning toward the east in the depth range from 0 km to 15 km. Using the hypocenter distribution we propose a schematic 3-D structure model of the source fault distinguished from the Bam fault. Eastern Bam city is located just above the northern part of the source fault and also on the rupture propagation direction from the asperity. It may be a major reason why eastern Bam city suffered the heaviest damage. (author abst.)