بررسی آماری وابستگی منطقه ای جنبش‌های قوی زمین در ایران و کالیفرنیا با استفاده از تحلیل واریانس

عاطفه درزی, محمدرضا ذوالفقاری

چکیده


در این مقاله بررسی آماری دقیقی از میزان وابستگی منطقه ای جنبش‌های قوی زمین در سه منطقه تکتونیکی 1) البرز- آذربایجان-کوپه داغ، 2) ایران مرکزی و 3) زاگرس با استفاده از روش تحلیل واریانس (ANOVA) مورد مطالعه قرار گرفت. در این تحلیل‌ها از مؤلفه‌های افقی شتاب طیفی در طیف وسیعی از پریود (01/0 تا 5 ثانیه) استفاده شد. بانک داده جنبش قوی زمین ایران متشکل از 1943 زوج رکورد شتاب حاصل از 426 زمین¬لرزه با بزرگای گشتاوری 5/4 تا 7/7 می باشد که توسط 680 ایستگاه شتاب‌نگاری ثبت شدند. در این مطالعه به منظور ترکیب مقادیر شتاب طیفی افقی از پارامتر GMRotI50 [1] که مستقل از جهت قرارگیری سنسورهای ثبت شتاب¬نگاشت نسبت به یکدیگر است استفاده شد. برای اولین بار مشخصاتی نظیر فاصله گسیختگی (نزدیک‌ترین فاصله به صفحه گسیختگی) و مکانیسم گسلش برای تمامی زلزله ها برآورد شد. برای 63 ایستگاه مقدار سرعت موج برشی در 30 متر فوقانی (V_S30) با استفاده از فرکانس اصلی ساختگاه و رویکرد مبتنی بر روش نسبت طیفی افقی به عمودی [2] تعیین شد. نتایج حاصل از این تکنیک حاکی از امکان ترکیب داده¬های ثبت شده در سه منطقه تکتونیکی و تشکیل پایگاه جنبش قوی زمین واحد برای کل ایران می باشد. تعداد 5902 رکورد از 217 زلزله در کالیفرنیا از بانک NGA-West2 استخراج و امکان ترکیب آنها با رکوردهای ایران از طریق تحلیل واریانس ارزیابی شد. در مورد تشابه جنبش‌های قوی ایران و کالیفرنیا نمی توان اظهارنظر قطعی داشت و داده¬های بیشتری از ایران مورد نیاز می باشد.

موضوع


بانک داده های جنبش قوی زمین؛ روابط کاهندگی؛ وابستگی منطقه ای؛ آنالیز واریانس؛ ایران؛ کالیفرنیا

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