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Calibrated Earthquake Locations in Iran Based on Joint Analyses of InSAR and Seismic Data

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Technical Report,10 May 2016,29 Dec 2017

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University of Rhode Island Narragansett United States

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In this one-year project extended for another six months to combine geodetic and seismic data to ground truth earthquakes, we made progress in the following aspects 1 InSAR data processing and analysis. We used InSAR data from Sentinal-1AB and Radarsat-2 to search for earthquakes in Iran after January 2011. We were able to identify 13 InSAR events from January 2011 to January 2018. Out of the 13 events, five were reported by other researchers, three were new and analyzed by us in this project, and five occurred near the end of the project therefore only data were processed but no slip model was determined. Before 2011, 19 InSAR events have been reported. Together, the total number of InSAR-constrained events in Iran reaches 32. 2 Seismic inversion for source parameters. We used global seismic data for full waveform seismic inversion of source parameters for several earthquakes. We found that the focal mechanism is more sensitive to depth than location. Using geodetic determined depth would help provide better focal mechanism solutions. 3 Relative relocation of small earthquakes. We used surface waves to relocate small earthquakes around InSAR-determined reference earthquakes. We used several criteria including distance, magnitude difference, and depth difference to determine the pairs. Then we run cross-correlation for all the pairs. We showed that this method worked well and allowed relocation of over 250 M greater or equal 4.5 earthquakes in the USGS catalog.

Subject Categories:

  • Seismology
  • Active and Passive Radar Detection and Equipment
  • Operations Research

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