TAILIEUCHUNG - Estimation of the frequency dependent shear wave attenuation from acceleration spectra of the Ahar - Varzeghan earthquake 2012

The data from a local network of 21 and 19 acceleration recordsfor 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. | JSEE Vol. 19, No. 3, 2017 Technical Note Estimation of the Frequency-Dependent Shear Wave Attenuation from Acceleration Spectra of the Ahar-Varzeghan Earthquake 2012 Saman Amiri 1, Majid Mahood 2*, and Hossein Hamzehloo 3 Received: 10/07/2017 Accepted: 27/08/2017 1. . Graduate in Earthquake Engineering, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran 2. Assistant Professor, Seismology Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran, * Corresponding Author; email: 3. Professor, Seismology Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran AB S T RA CT Keywords: Ahar-Varzeghan Earthquakes; Strong motion data; Source parameters; Shear wave attenuation Two destructive earthquakes occurred on 11th of August 2012 (Mw and ) in the Ahar and Varzeghan regions, NW Iran. High-frequency strong-motion data of these earthquakes have been analyzed to determine the Qb(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 Qb(f) relation is checked by comparing the source spectra in various stations with the theoretical spectra. Low values of the coefficient (Q600) for the stable regions and intermediate values for the moderate regions [7-8]. Table (1) presents a comparative list of worldwide Qb(f) relationships. As it can be seen, low value of Q in north-west of Turkey illustrates tectonically and seismically active while .

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