نوع مقاله : مقاله پژوهشی
نویسندگان
1 سازمان نقشه‌برداری کشور، اداره ژئودزی و ژئودینامیک، تهران، ایران
2 دانشگاه صنعتی خواجه نصیرالدین طوسی،گروه مهندسی ژئودزی و ژئوماتیک، تهران، ایران
3 مرکز تحصیلات تکمیلی در علوم پایه زنجان،گروه فیزیک، زنجان، ایران
4 پژوهشگاه بین المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران
5 سازمان زمین‌شناسی واکتشافات معدنی کشور، پژوهشکده علوم‌زمین، تهران، ایران
چکیده
مطالعه رفتار سنگ‌کره(سنگ‌کره) به عنوان یک لایه مکانیکی قوی که شامل پوسته و گوشته بالایی است از جمله مباحث روز علوم ژئودینامیک است. در این مقاله با استفاده از مدل‌سازی عددی سه بعدی به روش المان محدود و استفاده از یک ریولوژی ویسکوز وابسته به دما (خزشی) در دو حالت مرطوب و خشک رفتار مکانیکی سنگ‌کره در زاگرس با استفاده از دو ژئوترم گرم و سرد مورد بررسی قرار می‌گیرد. ستبرای پوسته بالا و پایین و همچنین قسمت گوشته بالایی بر اساس نگاشت‌های زلزله‌شناسی ( (Yaminifar, 2007; Paul, 2006; Hatezfeld, 2003 در مناطق مختلف زاگرس در نظرگرفته شده است. گسل‌ها به صورت المان‌های ویژه در مدل جاسازی شدند و از قانون کولمب پیروی می‌کند. نتایج نشان می‌دهد که مرز تغییر شکل (BDT) برای ژئوترم سرد و ریولوژی مرطوب در ژرفای 10.5کیلومتری و برای ژئوترم سرد و ریولوژی خشک در ژرفای 14کیلومتری رخ می‌دهد. همچنین این مرز تغییر شکل(BDT) برای ژئوترم گرم به ترتیب در ژرفای 8 و 11 کیلومتری رخ می‌دهد. این نتایج تطابق خوبی با ژرفای زمین‌لرزه‌هایی که در منطقه زاگرس رخ می‌دهد (Tatar, 2004; Jackson, 2008) دارد و گویای استحکام سنگ‌کره در قسمت پوسته متمرکز است.
کلیدواژه‌ها
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