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Source Parameters for Moderate Earthquakes in the Zagros Mountains with Implications for the Depth Extent of Seismicity

Department of Geosciences, Pennsylvania State University, 801 Deike Building, University Park, Pennsylvania 16802 aadams{at}geosc.psu.edu rab27{at}psu.edu andy{at}geosc.psu.edu

Arthur Rodgers

Earth Sciences Division, Lawrence Livermore Laboratory, Livermore, California 94551 rodgers7{at}llnl.gov

Abdullah Al-Amri

Seismic Studies Center and Geology Department, King Saud University, 11451 Riyadh, Saudi Arabia amri444{at}yahoo.com

Online Material: Results for moment tensor inversion and depth phase modeling are shown for five additional events.

Six earthquakes within the Zagros Mountains with magnitudes between 4.9 and 5.7 have been studied to determine their source parameters. These events were selected for study because they were reported in open catalogs to have lower crustal or upper mantle source depths and because they occurred within an area of the Zagros Mountains where crustal velocity structure has been constrained by previous studies. Moment tensor inversion of regional broadband waveforms has been combined with forward modeling of depth phases on short-period teleseismic waveforms to constrain source depths and moment tensors. Our results show that all six events nucleated within the upper crust (<11 km depth) and have thrust mechanisms. This finding supports other studies that call into question the existence of lower crustal or mantle events beneath the Zagros Mountains.