کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4741369 1641488 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tomography of the source zone of the 2015 M 7.8 Nepal earthquake
ترجمه فارسی عنوان
توموگرافی ناحیه منبع زمین لرزه سال 2015 M 7.8 نپال
کلمات کلیدی
توموگرافی لرزه ای؛ بی نهایت لرزه ای؛ لرزه نگاری؛ زمین لرزه 2015 نپال؛ کمربند برخورد هیمالیا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی

We conducted P-wave anisotropic tomography beneath Nepal and surrounding areas to clarify the causal mechanism of the 25 April 2015 Nepal earthquake (Mw 7.8) and dynamic processes of the India-Asia collision zone. Our results show that hypocenters of the 2015 Nepal mainshock and the 1833 Nepal earthquake (M 8.0) are located in a zone with a higher P-wave velocity (high-V), and the high-V zone coincides with the coseismic slip area of the 2015 Nepal mainshock. The high-V zone may reflect a strongly coupled patch (i.e., asperity) in the megathrust zone between the subducting Indian plate and the overlying Eurasian plate. This result suggests that the nucleation of the Nepal earthquakes was controlled by structural heterogeneities in the megathrust zone. Significant variations of P-wave velocity anisotropy are revealed across the Himalaya collision belt. The predominant fast P-wave velocity direction is NE–SW beneath northern India, whereas it becomes NW–SE beneath the Himalaya, suggesting that the fossil anisotropy in the Indian plate is overprinted by the ongoing India-Asia collision.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 253, April 2016, Pages 58–63
نویسندگان
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