Abstract
The August 11, 2012 Mw 6.4 earthquakes in northwestern Iran occurred as a result of oblique strike-slip faulting in the shallow crust of the Eurasia plate, approximately 300 kilometer east of the plate boundary between the Eurasia and Arabia plates. The seismotectonics of this region is controlled by the collision of the Arabia and Eurasia plates; at the latitude of the earthquakes, the Arabia plate moves almost due north with respect to the Eurasia plate at a rate of approximately 26 millimeter per year. Over the past forty years, seven earthquakes of Mw 6 or greater have occurred within 300 kilometer of today’s events. The nearest was a Mw 6.1 earthquake in February of 1997, approximately 100 kilometer to the east, which caused 1100 fatalities. The studied area encourage the authors to determine the focal mechanism, source time function and sub events’ features which can guide us to reliable judges.
Highlights
IntroductionLarge earthquakes are interesting because of the effects caused and because of their size
For most seismologists, large earthquakes are interesting because of the effects caused and because of their size
Mw 6.4 earthquakes in northwestern Iran occurred as a result of oblique strike-slip faulting in the shallow crust of the Eurasia plate, approximately 300 kilometer east of the plate boundary between the Eurasia and Arabia plates. The seismotectonics of this region is controlled by the collision of the Arabia and Eurasia plates; at the latitude of the earthquakes, the Arabia plate moves almost due north with respect to the Eurasia plate at a rate of approximately 26 millimeter per year
Summary
Large earthquakes are interesting because of the effects caused and because of their size. From seismological point of view, some of earthquake parameters such as magnitude, source time function, focal mechanism and seismic moment are more important than the others. Approaches [10]-[12], impose that the source time function is the same at all stations This assumption is reasonable for moderate earthquakes, at least if high frequency waves are discarded, but becomes increasingly invalid as the magnitude and source dimension increase; extended source effects cause the STFs to be dependent on the recording station [13]. The present study aims to focus on determination of source time function and focal mechanism of Ahar-Varzaghan earthquake (11 August 2012, at 12:23:18 (UTC), Mw = 6.5) in NorthWest Iran. Aminipanah et al The main goal of this study is to obtain how far the rupture propagation was related to the strong ground motion distribution
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