بررسی ارتباط بین تغییرات استرس کولمب و توزیع مکانی پس لرزه‌ها : به منظور برآورد عمق زمین لرزه‌ها در کمربند زاگرس

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین شناسی ، دانشکده علوم، گلستان ، گرگان

چکیده

      یکی از گسترده‌ترین معیارها برای مطالعه نواحی تغییر تنش حاصل از رخداد یک زمین‌لرزه، معیار کلمب است. عمق زمین‌لرزه‌های زاگرس همواره مورد سؤال بوده است. در این پژوهش این مدل برای سه زمین‌لرزه نسبتاً بزرگ زاگرس بکار گرفته شده است. این زمین‌لرزه‌ها عبارتند از: زمین‌لرزه 27 مرداد 1393 ایلام (با بزرگی گشتاوری 2/6)، 20 فروردین 1392 بوشهر (با بزرگی گشتاوری 3/6) و 20 شهریور 1387 قشم (با بزرگی گشتاوری 1/6). در این زمین‌لرزه‌ها انطباق بین توزیع مکانی پس‌لرزه‌ها و محیط‌های افزایش تنش حاصل از رخداد شوک اصلی در اعماق مختلف با هم مقایسه شدند. نتیجه کار نشان می‌دهد که عمق 5 کیلومتر برای زمین‌لرزه‌های ایلام و بوشهر و عمق 5/5 کیلومتر برای زمین‌لرزه‌ی قشم منطقی به نظر می‌رسد. در این پژوهش یکی از کاربردهای استفاده از تغییرات تنش کلمب حاصل از رخداد یک زمین‌لرزه جهت محاسبه پارامترهای زمین‌لرزه معرفی گردد.

کلیدواژه‌ها

موضوعات


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