کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4731534 | 1640418 | 2012 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Plate-wide deformation before the Sumatra-Andaman Earthquake
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Rock is weak to shear-stress and the energy released by the 26th December, 2004, M â 9.2 Sumatra-Andaman Earthquake, the largest earthquake for four decades, must have accumulated over enormous volumes of crust and mantle, certainly plate-wide, possibly world-wide. Here we report evidence for plate-wide stress accumulation. Changes in seismic shear-wave splitting monitor stress-induced changes in the geometry of the microcrack distributions in almost all rocks in the Earth's crust. Such changes observed in Iceland show stress-accumulation beginning at least four years before the Sumatra-Andaman Earthquake. These changes were recognised as monitoring stress-accumulation before an impending large earthquake and 10 'stress-forecasts' were emailed to Iceland Meteorological Office for some 29 months forecasting an impending large earthquake. The remarkable sensitivity of critical-systems of microcrack geometry to miniscule changes of stress had not been recognised at that time and the stress-accumulation was expected to lead to a M ⩾ 7 earthquake somewhere in Iceland. Only now is it recognised that the changes in shear-wave splitting were monitoring stress-accumulation which would eventually lead to the Sumatra-Andaman Earthquake at a distance of some 10,500 km on the opposite side of the Eurasian Plate. This extreme sensitivity confirms the critical nature of fluid-saturated stress-aligned microcracks in the Earth's crust.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 46, 2 March 2012, Pages 61-69
Journal: Journal of Asian Earth Sciences - Volume 46, 2 March 2012, Pages 61-69
نویسندگان
Stuart Crampin, Yuan Gao,