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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Response spectral attenuation relationships for Singapore and the Malay Peninsula due to distant Sumatran-fault earthquakes
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Response spectral attenuation relationships for Singapore and the Malay Peninsula due to distant Sumatran-fault earthquakes

机译：苏门答腊断裂带地震导致新加坡和马来半岛的响应光谱衰减关系

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摘要

As part of the effort to assess the seismic hazards of Singapore and the Malay Peninsula, representative ground motion prediction models have to be established. Seven existing attenuation relationships developed for shallow crystal earthquakes in stable continent and active tectonic regions are examined, and they are found to consistently over-predict the ground motions of Sumatran-fault earthquakes recently recorded in Singapore. This may be attributed to the differences in the regional crustal structures and distance ranges considered. Since the number of recorded ground motions in the region is very limited, a new set of attenuation relationships is derived based on synthetic seismograms. The uncertainties in rupture parameters, such as stress drop, focal depth, dip and rake angles, are defined according to the regional geological and tectonic settings as well as the ruptures of previous earthquakes. Ground motions are simulated for earthquakes with M_w ranging from 4.0 to 8.0, within a distance range from 174 to 1379 km. Besides magnitude and distance, source-to-station azimuth is found to influence the amplitudes of the ground motions simulated. Thus, the azimuth is taken as an independent variable in the derived ground motion attenuation relationships. The Sumatran-fault segments that have the potential to generate a specified level of response spectral accelerations in Singapore and Kuala Lumpur are identified based on the newly derived ground motion models.
机译：作为评估新加坡和马来半岛地震危险性工作的一部分，必须建立代表性的地面运动预测模型。研究了在稳定大陆和活跃构造区域为浅水晶地震建立的七个现有衰减关系，发现它们始终一致地高估了最近在新加坡记录的苏门答腊断层地震的地震动。这可能归因于所考虑的区域地壳结构和距离范围的差异。由于在该区域记录的地面运动的次数非常有限，因此基于合成地震图得出了一组新的衰减关系。破裂参数的不确定性，例如应力下降，震源深度，倾角和前角，是根据区域地质和构造环境以及先前地震的破裂确定的。在174至1379 km的距离范围内，模拟M_w为4.0至8.0的地震的地震动。除了幅度和距离外，还发现了源到站的方位角会影响模拟的地面运动的幅度。因此，在导出的地面运动衰减关系中，将方位角作为独立变量。根据新推导出的地面运动模型，确定了可能在新加坡和吉隆坡产生指定水平的响应谱加速度的苏门答腊断裂带。

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