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

نوع مقاله : Articles

نویسندگان

1 دانشگاه خواجه ‌نصیرالدین طوسی، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه خواجه‌نصیرالدین طوسی، تهران، ایران

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 زمین‌لرزه 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 شتاب‌نگاشت 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 داده‌های 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 داده‌های بیشتری از ایران مورد نیاز می باشد.

کلیدواژه‌ها

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  • تاریخ دریافت: 11 مهر 1396
  • تاریخ بازنگری: 19 بهمن 1399
  • تاریخ پذیرش: 06 دی 1399

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