Assessment of Site Response to Long Distance Sumatra Earthquakes
نویسندگان
چکیده
ABSTRACT – Singapore is a city state island located off the southern tip of Malaysia Peninsula. Although Singapore is located in a low seismicity area with mild winds, it is a classic example of low seismic hazard and high exposure scenario. It is about 400 km away from a highly active earthquake belt comprising the Sumatra fault and the subduction zone. The response of a building to long-distance earthquakes depends on the type of structural systems and the local geological condition. In order to investigate the response of various sites in Singapore to long distance Sumatra earthquakes, microtremor measurements were carried out across the island. Recorded data from these measurements were analysed in MATLAB environment by following Nakamura’s technique. For the site responses vary from one location to another, the geographical information system (GIS), MAPINFO is used to present the spatially varying information of ground motions. From microtremor measurements carried out in this exercise, the correlation between the site fundamental frequency and the general geotechnical properties is well established. Knowing general geotechnical properties of a particular site, its response to long distance earthquake can be inferred.
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