| Determination of focal mechanism, seismic momentum and slip distribution of Zarand, February 22, 2005 earthquake by combining seismic data and radar data |
| Paper ID : 1414-SMPR |
| Authors: |
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Narges Jafarabadi1, Ali Moradi *2, Sanaz Vajedian3 1Geophysics institute of university of Tehran 2Institute of Geophysics, University of Tehran 3Institute of Photogrammetry and GeoInformation, Leibniz Universität Hannover, 30167 Hannover, Germany |
| Abstract: |
| Understanding seismic sources is a key element to better understanding of tectonics processes and evaluate how continental lithosphere behaves physically in response to plate tectonic forces. In this study, we integrate observation from seismic and SAR data in order to estimate the source parameters of Mw = 6.3 Zarand earthquake. We first used time-domain moment tensor inversion method to determine focal mechanism of the earthquake by modeling the waveform. For this purpose, we used broadband data provided by IIEES (International Institute of Earthquake Engineering and Seismology) and Ferdowsi University. Second, the calculated focal mechanism in this stage was employed as the input for slip distribution modeling by SAR data. SAR data acquired by Envisat satellite data, operated in C-band, was processed to produce coseismic displacement of Mw=6.3 Zarand earthquake. In this article, coseismic SAR images, acquired before and after the earthquake, have been processed to derive the displacement field caused by earthquake. The results are further used to infer the source parameters of the fault using a uniform slip model. After solving the geometric parameters, we fix the fault geometry and estimate the distribution of the slip on the fault plane. Our result confirm that a reverse with a small component of strike – slip fault with the maximum slip of 5.5 m at the depth of 3.5 km was responsible for February 22, Zarand 2005 earthquake. As well as this, the results for strike, dip and rake are 279, 70 and 122 respectively. |
| Keywords: |
| Radar Interferometry, Zarand earthquake, Focal Mechanism, ISOLA, Source Parameters |
| Status : Paper Accepted (Oral Presentation) |
