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H. Hamzehloo H. Rahimi I. Sarkar M. Mahood H. Mirzaei Alavijeh E. Farzanegan 《Journal of Seismology》2010,14(2):169-195
We analyze the strong motion accelerograms of the moderate (M
w = 6.1), March 31, 2006, Darb-e-Astane earthquake of western Iran and also those of one of its prominently recorded, large
(M
w = 5.1) foreshock and (M
w = 4.9) aftershock. (1) Using derived SH-wave spectral data, we first objectively estimate the parameters W o\mathit{\Omega} _{\rm o} (long period spectral level), f
c (corner frequency) and Q(f) (frequency dependent, average shear wave quality factor), appropriate for the best-fit Brune ω
− 2 spectrum of each of these three events. We then perform a non-linear least square analysis of the SH-wave spectral data to
provide approximate near-field estimates of the strike, dip, and rake of the causative faults and also the seismic moment,
moment magnitude, source size, and average stress drop of these three events. (2) In the next step, we use these approximate
values and an empirical Green’s function approach, in an iterative manner, to optimally model the strong ground motion and
rupture characteristics of the main event in terms of peak ground acceleration/velocity/displacement and duration of ground
shaking and thereby provide improved, more reliable estimates of the causative fault parameters of the main event and its
asperities. Our near-field estimates for both the main moderate event and the two smaller events are in good conformity with
the corresponding far-field estimates reported by other studies. 相似文献
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Eshaghi Attieh Aoudia Abdelkrim Shahvar Mohammad P. Farzanegan Esmail 《Journal of Seismology》2022,26(5):883-895
Journal of Seismology - In this study, seismic moment, moment magnitude, and the corner frequency of Iranian earthquakes were estimated using the Iran Strong Motion Network (ISMN) data. To estimate... 相似文献
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Zoya Farajpour Mehdi Zare Shahram Pezeshk Anooshiravan Ansari Esmael Farzanegan 《Arabian Journal of Geosciences》2018,11(4):80
This paper discusses a newly developed high-quality integrated dataset of shallow earthquake ground motions that occurred in Iran, from 1976 to 2013. A total of 860 three-component strong motion records are processed from 183 earthquake events, moment magnitudes 5.0?≤?M w ?≤?7.4, and rupture distances of R RUP ≤ 120 km. Strong motion data from Iran having special tectonic features and shallow earthquakes with depths less than 35 km are included. This paper presents a thorough procedure used to collect and to generate a database following the Next-Generation Attenuation-West research projects. This database can be used in the development and ranking of ground motion models and for seismological and engineering hazard and risk analyses. Unprocessed strong motion records are obtained from the Iranian Strong Motion Network (ISMN). The time series collected were thoroughly examined through several rounds of quality reviews. The newly generated database includes the peak ground acceleration, peak ground velocity, and pseudo-spectral acceleration for the 5% damped with periods ranging from 0.01 to 10 s. The database also includes ground motion information and source characterization and parameters. This study is the near-source compiled ground motion database that can be used for Iran, and it is consistent with standard worldwide databases. 相似文献
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