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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Geophysics
- نوع مقاله: Journal Article
- کلمات کلیدی: Strong ground motion,Rupture characteristics,Empirical Green Function,Ahar-Varzagan earthquake doublet
- چکیده: On August 11, 2012,within several minutes, two shallow destructive earthquakes with moment magnitudes of 6.5 and 6.4 occurred in Varzagan, Azerbaijan-e-Sharghi Province, in the northwest of Iran In this study, the Empirical Green Function (EGF) method was used for strong ground motion simulationto estimate the source parameters and rupture characteristics of the earthquakes. To simulate the first earthquake, two aftershocks with magnitudes of 5.6 and 5.2 were used as the EGFs. In the second event, an aftershock with a magnitude of 5 was used as the small event. The size of the main fault caused by the first event was about 18 km in length and 10 km in width. Also, the size of the asperity in the second earthquake was about 16 km in the strike direction and 11 km in the dip direction. The durations of the ruptures in the first and second events were more than 9 and 10s, respectively. The estimated fault plane solution showed strike-slip faulting for the first earthquake and a reverse mechanism with a strike-slip component for the second one. Strike, dip and rake of a causative fault of the first and second earthquakes were determined as 270, 81 and 175 degrees and 230, 57 and 134 degrees, respectively. In addition, the stress drop in the first and second events was calculated to be about 22 and 34 bar, respectively.
- چکیده انگلیسی: On August 11, 2012,within several minutes, two shallow destructive earthquakes with moment magnitudes of 6.5 and 6.4 occurred in Varzagan, Azerbaijan-e-Sharghi Province, in the northwest of Iran In this study, the Empirical Green Function (EGF) method was used for strong ground motion simulationto estimate the source parameters and rupture characteristics of the earthquakes. To simulate the first earthquake, two aftershocks with magnitudes of 5.6 and 5.2 were used as the EGFs. In the second event, an aftershock with a magnitude of 5 was used as the small event. The size of the main fault caused by the first event was about 18Â km in length and 10 km in width. Also, the size of the asperity in the second earthquake was about 16Â km in the strike direction and 11 km in the dip direction. The durations of the ruptures in the first and second events were more than 9 and 10s, respectively. The estimated fault plane solution showed strike-slip faulting for the first earthquake and a reverse mechanism with a strike-slip component for the second one. Strike, dip and rake of a causative fault of the first and second earthquakes were determined as 270, 81 and 175 degrees and 230, 57 and 134 degrees, respectively. In addition, the stress drop in the first and second events was calculated to be about 22 and 34 bar, respectively.
- انتشار مقاله: 05-02-1394
- نویسندگان: Hesaneh Mohammadi,Mohammadreza Gheitanchi
- مشاهده
- جایگاه : پژوهشی
- مجله: Advance Researches in Civil Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Strong ground motion,Source Parameters,Rupture characteristics,Empirical Green Function,stochastic finite-fault method
- چکیده:
- چکیده انگلیسی: On April 5, 2017, an earthquake with moment magnitude of 6.1 occurred Sefid-Sang area about 80 km southeast of Mashhad city in Khorasan-e-Razavi province. In this study, to estimate source parameters and rupture characteristics of the earthquake, the Empirical Green Function (EGF) method and the stochastic finite-fault (SFF) technique were used for strong ground motion simulation. Then the observed records and the simulated graphs by these two methods, were compared. To simulate the earthquake by EGF method, an aftershock with moment magnitude of 4.8 was used as the empirical Green function. The size of the main fault caused by the event was about 10 km in length and 8 km in width. The duration of the rupture in this event was about 18 seconds. The estimated fault plane solution shows reverse mechanism with strike-slip component. Strike, dip and rake of causative fault of the earthquake were determined as 311, 55 and 117 degrees. In addition, the stress drop in this event was calculated to be about 8 bars.
- انتشار مقاله: 19-09-1398
- نویسندگان: Hesaneh Mohammadi,Maryam Sedghi,Mohammad Reza Gheitanchi
- مشاهده