| Autor: |
Amiri, Saman, Mahood, Majid, Hamzehloo, Hossein |
| Předmět: |
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| Zdroj: |
Journal of Seismology & Earthquake Engineering; 2017, Vol. 19 Issue 3, p231-245, 15p |
| Abstrakt: |
Two destructive earthquakes occurred on 11th of August 2012 (Mw 6.5 and 6.4) in the Ahar and Varzeghan regions, NW Iran. High-frequency strong-motion data of these earthquakes have been analyzed to determine the Qγ(f) and source parameters by inversion of the recorded data. The data from a local network of 21 and 19 acceleration records for the first and second main shocks have been used to estimate Q-relationship in 30 stations. The seismic hazard map for this region illustrates that most of the area in this province is located within high relative risk and characterized by a large number of heterogeneities. For frequency band of 1 to 20 HZ, the frequency-dependent attenuation for this region has been estimated. The authenticity of achieved Qγ(f) relation is checked by comparing the source spectra in various stations with the theoretical spectra. Low values of the coefficient (Q<200) in the Qγ(f) relation suggest that the region is seismically and tectonically active. The present inversion of strong-motion data gives the source parameters i.e. corner frequencies and stress drops as fc1= 0.08 Hz, fc2= 0.11 Hz, Δ1=77.14 bar and Δ2=33.06 bar, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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