基于汶川强震记录预警参数研究及在仪器中的应用

地震预警作为一种能够有效减轻地震灾害的手段已经被世界上越来越多的国家和地区所研究,并在实际应用中取得了显著的减灾实效.利用汶川主震及其余震的强震观测记录研究了特征周期τc与震级的相关性、位移幅值Pd与峰值速度PGV的相关性以及τc和Pd的乘积与震级的关系.统计结果表明,τc与震级以及Pd与PGV之间都有较好的相关性,验证前人的统计结果.另外,τc和Pd的乘积与震级的关系也与台湾地区的结果一致.最后,研究结果被应用到了两款不同的仪器中,形成一套现地地震预警系统.

Early-warning parameters research based on wenchuan earthquake strong motion records and its application in instruments

As one of the effective ways to mitigate earthquake hazards,earthquake early warning （EEW） has been studied by many countries and regions in the world.They have achieved significant mitigation practical effectiveness during operations.We studied the correlation between the characteristic period τc and the event magnitude,between the peak displacement （Pd） and the peak ground velocity （PGV）,and the relationship between the product of τc and Pd and the event magnitude.The used dataset spans from 12 May 2008 to 1 October 2008 and includes 54 events with magnitude greater than or equal to 4,among them the main event,the main aftershocks and 4 events with magnitude greater than 6.The statistical results show that there are good correlations between τc and magnitude,and between Pd and PGV,confirming previous results.In addition,the relationship between the product of τc and Pd and magnitude is similar to the result of Taiwan.Finally,the results are applied to two different instruments and an on-site early warning system is formed.