اثر الطريقة الانكسارية الدقيقة (ReMi) و اهميتها في التصنيف التفصيلي للموقع وتحديد الطبقات عالية السرعة

In the last few years the Active Multichannel Analysis of Surface Waves (MASW) and Refraction Microtremor (ReMi) methods were developed to determine average shear wave velocity of the upper surface layers (Vs30) which is used for site classification and seismic microzonation studies of urban areas to reduce earthquake risks. This research showed the usefulness and importance of the use of ReMi method to study the deep soil layers which may reach a depth of more than 30 m in the city of Irbid (Jordan), located 25 km east of the Dead Sea Transform (DST) fault system. It was evident that ReMi method was able to identify depth and thickness of basaltic layers of high seismic velocities found at depths greater than 10 m, while the depth of investigation using the MASW was no more than 10 m. The research emphasizes the need for the integrated application of use of the ReMi method and MASW method in seismic field surveys for site and soil seismic classification studies. In the study area we have observed that the site classification of some profiles have changed according to the code of the Federal Emergency Management Agency, for example: site classification of profile (C43) has moved from class D3 to class C2, which means the need to change the conditions and criteria for the design of buildings for this site