The 2003 Bam (SE Iran) earthquake: Precise source parameters from satellite radar interferometry

  • Wang R
  • Xia Y
  • Grosser H
 et al. 
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Abstract

Differential radar interferometry provided high-quality near-field
deformation data for the 2003 Bam earthquake and therefore strong
constraints on its source parameters. The ruptured fault segments
could be clearly detected by using a Sobel Edge Filter on the phase-unwrapped
deformation field. The estimated total rupture length is about 24
km. More than 80 per cent of the seismic moment was released from
its southern segment of about 13 km, where the slip reached a maximum
of up to 270 cm resulting in a stress drop of at least 6 MPa. In
addition, optical remote sensing data show that the Bam fault is
not a single fault but consists of a 4-5 km wide fault system with
the known main branch running between the city of Bam and Baravat.
The fault ruptured by the Bam earthquake appears to continue the
NW branch of this fault system from Bam city southwards. Based on
these results, we suggest that the Bam earthquake ruptured a hidden
or new fault and that in this process an unusually strong asperity
was involved.

Author-supplied keywords

  • Bam fault
  • D-Insar
  • Inversion method
  • Slip model

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Authors

  • R. Wang

  • Y. Xia

  • H. Grosser

  • H. U. Wetzel

  • H. Kaufmann

  • J. Zschau

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