کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6433318 1636709 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-resolution 3D seismic reflection imaging across active faults and its impact on seismic hazard estimation in the Tokyo metropolitan area
ترجمه فارسی عنوان
تصویربرداری انعکاسی لرزه ای با وضوح بالا در سراسر گسل های فعال و تاثیر آن در برآورد خطر لرزه ای در منطقه شهری توکیو
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- 3D seismic cube was collected across an active fault scarp in Tokyo.
- The hypothesized scarp was interpreted as a terrace riser rather than in a tectonic origin.
- Results suggest a reduced seismic hazard in Tokyo from earthquakes by active faults.

We collected and interpreted high-resolution 3D seismic reflection data across a hypothesized fault scarp, along the largest active fault that could generate hazardous earthquakes in the Tokyo metropolitan area. The processed and interpreted 3D seismic cube, linked with nearby borehole stratigraphy, suggests that a monocline that deforms lower Pleistocene units is unconformably overlain by middle Pleistocene conglomerates. Judging from structural patterns and vertical separation on the lower-middle Pleistocene units and the ground surface, the hypothesized scarp was interpreted as a terrace riser rather than as a manifestation of late Pleistocene structural growth resulting from repeated fault activity. Devastating earthquake scenarios had been predicted along the fault in question based on its proximity to the metropolitan area, however our new results lead to a significant decrease in estimated fault length and consequently in the estimated magnitude of future earthquakes associated with reactivation. This suggests a greatly reduced seismic hazard in the Tokyo metropolitan area from earthquakes generated by active intraplate crustal faults.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 689, 15 October 2016, Pages 79-88
نویسندگان
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