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收集了台湾强震观测计划(TSMIP)台站记录的2010年袭击台湾南部的甲仙地震(M6.4)的强震加速度图,用来对我们提出的短距离地震预警(EEW)方法进行离线测试。2010年的甲仙地震表明了人们对短距离地震预警的迫切需求。所测试的短距离地震预警方法是一种基于阈值的方法,依赖于滤波后的垂直位移的幅度。我们的结果显示,与台湾当前针对短距离警报的地震预警系统(EEWS)相比,所测试方法的地震预警提前时间有了显著提高。对于震中距约为25km的地方,地震预警的提前时间比强地震动加速度到达时间早了2~4s。我们认为,这种基于阈值的地震预警方法也许可用于目标地区和全球孕震区附近急需地震预警的对象。
A strong ground motion acceleration map of the Miaxian earthquake (M6.4) attacked by southern Taiwan in 2010, recorded by the Taiwan Strong Earthquake Observation Program (TSMIP) station, was collected and used to offline our proposed short-range earthquake warning (EEW) method test. The 2010 earthquake in Miaoxian shows the urgent need for early warning of short-range earthquakes. The short-range earthquake early warning method tested is a threshold-based method that depends on the magnitude of the filtered vertical displacement. Our results show that the earthquake warning early detection time of the tested method has been significantly improved compared to the current earthquake early warning system (EEWS) for short-range warnings in Taiwan. For the epicentral distance about 25km, the advance warning time of earthquake is 2 ~ 4s earlier than the acceleration of strong earthquakes. In our opinion, this threshold-based earthquake warning method may be applied to the target in urgent need of earthquake warning near the target area and the global seismogenic zone.