مقاله لرزه خیزی پاکستان با تأکیدی بر زلزله اخیر پاکستان

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بخشی از متن مقاله لرزه خیزی پاکستان با تأکیدی بر زلزله اخیر پاکستان :

تعداد صفحات:۱۱

چکیده:

To Study the seismicity of Pakistan and investigate the characteristics of the 8th October 2005 destructive earthquake in north Pakistan, the source parameters of the recorded earthquakes by the seismic stations in the world during the past 40 years as well as the recent earthquake in Pakistan and it’s aftershocks where collected. Then the epicenter distribution of earthquakes where over lapped on the faults map in the Middle East. Fault plane solutions of 98 strong earthquakes in Pakistan and neighbouring regions in Afghanistan and India were determined by the polarity of initial p waves. In next stage, the seismic energy released by strong earthquakes in the region was determined from magnitude using Richter relation of magnitude – energy in each 0,5×۰,۵ sub square and plotted on the faults map of the region The fault offset of the main earthquake was calculated to be 8 m, it’s source duration was about 40 s and it cuased a faulting about 120 Km. it’s stress drop was calculated about 40 bar. The fault offset of the strongest aftershock was calculated to be 2,5 m, it’s source duration was about 3 s and it cuased a faulting about 10 Km. It’s stress drop was calculated about 14 bar. The result indicated that the Pamir- Hindu Kush region was seismically active during the past 40 years which released significant seismic energy each year. Instrumental and historical data indicated that the hypocenter region of the recent earthquake in Pakistan did not show significant seismic activity during the past 100 years and describe a kind of seismic gap. In other words the recent earthquake is the largest one ever accured during the past 100 years. The recent earthquake is very similar to the 1978 Tabas earthquake in Iran. The source mechanism of both earthquakes had trust type mechanisms and both had shallow depths and had very similar stress drop. Both earthquakes fallow many strong trust type aftershocks.