Collaborative Research: Ground Truth of African and Eastern Mediterranean Shallow Seismicity Using SAR Interferometry and Gibbs Sampling Inversion
Abstract
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 InSAR/CIT 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 05, 2006
- Accession Number
- ADA466900
Entities
People
- Benjamin A. Brooks
- Eric Sandvol
- Francisco Gomez
- L. N. Frazer
Organizations
- University of Hawaiʻi System