A Study of the Strong Ground Motions of ۲۶ December ۲۰۰۳ Bam Earthquake: Mw۶.۵
سال انتشار: 1383
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 268
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شناسه ملی سند علمی:
JR_JSEE-5-4_013
تاریخ نمایه سازی: 14 آبان 1400
چکیده مقاله:
The Bam earthquake of ۲۶ December ۲۰۰۳ (Mw۶.۵) occurred at ۰۱:۵۶:۵۶ (GMT, ۰۵:۲۶:۵۶ local time) around the city of Bam in the southeast of Iran. The Bam earthquake of ۲۶/۱۲/۲۰۰۳ (Mw۶.۵) has demolished the city of Bam, having a population of about ۱۰۰۰۰۰ at the time of the earthquake. The Bam fault-which was mapped before the event on the geological maps-has been reactivated during the ۲۶/۱۲/۲۰۰۳ earthquake. It seems that a length of about ۱۰km (at the surface) of this fault has been reactivated, where it passed exactly from the east of the city of Bam. The fault has a slope towards the west and the focus of the event was located close to the residential area (almost beneath the city of Bam). This caused a great damage in the macroseismic epicentral zone; however the strong motions have been attenuated very rapidly, specially towards the east-and west (fault normal) direction. The vertical directivity effects caused the amplification of the low frequency motions in the fault-normal direction as well as the greater amplitude of the motion on the vertical direction. Two strong phases of energy are seen on the accelerograms. The first comprises of a starting sub-event with right-lateral strike slip mechanism which is located south of Bam. The mechanism of the second sub-event is reverse mechanism. The comparison of observed and simulated ground motion indicates that rupture started at a depth of ۸km, south of Bam and propagated toward north.
کلیدواژه ها:
Bam ، Strong Motions ، Data Processing ، Source Parameters ، Simulation ، Stress Drop ، Velocity ، Displacement ، SH Waves ، Sub-events
نویسندگان
Mehdi Zare
IIEES
Hossein Hamzehloo
IIEES