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Collaborative Research: Ground Truth of African and Eastern Mediterranean Shallow Seismicity Using SAR Interferometry and Gibbs Sampling Inversion

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Final rept. 24 Dec 2003-23 Jun 2006

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We evaluate the use of Synthetic Aperture Radar Interferometry InSAR to provide GT5 or better locations for shallow earthquakes of moderate size Mw 5 - 6.5 in primarily Africa and the Middle East, although we also included some events from Asia. We find that InSAR is capable of routine detection of surface displacements associated with small Mw 5.5 seismic events. Additionally, we find that, in some cases, inversion of the surface displacement field alone can meet GT5 criteria. In many cases, however, although CIT location criteria appear to be met by The inversion, the overall solution including strike, rake, and dip of the fault plane is not consistent with additional information such as focal mechanism and so there may be some question to its overall accuracy. This suggests that in order to start to properly create an InSARCIT catalog, the next level inversion should incorporate prior information properly propagating errors such as the focal mechanism. We provide 2 new GT5 events for the existing catalog. We were successful in collecting seismic data from which we were able to measure origin times for all sixteen events. Collected waveforms for the Sultan Dagi, Turkey event help us identify the likely existence of a small foreshock.

Subject Categories:

  • Seismology
  • Active and Passive Radar Detection and Equipment
  • Optics

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