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Ground motions observed during the 15 August 2007 Pisco, Peru, earthquake

机译:在2007年8月15日秘鲁皮斯科地震中观测到的地震动

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摘要

AMw 7.9 earthquake event occurred on 15 August 2007 off the coast of central Peru, 60 km west of the city of Pisco. This event is associated with subduction processes at the interface of the Nazca and South American plates, and was characterised by a complex source mechanism involving rupture on two main asperities, with unilateral rupture propagation to the southeast. The rupture process is clearly reflected in the ground motions recorded during this event, which include two separate episodes of strong shaking. The event triggered 18 accelerographic stations; the recordings are examined in terms of their characteristics and compared to the predictions of ground-motion prediction equations for subduction environments, using the maximum-likelihood-based method of Scherbaum et al. (Bull Seismol Soc Am 94(6):2164–2185, 2004). Additionally, macroseismic observations and damage patterns are examined and discussed in the light of local construction practices, drawing on field observations gathered during the post-earthquake reconnaissance missions.
机译:2007年8月15日,在皮斯科市以西60公里的秘鲁中部海岸附近发生了7.9级AMw地震。该事件与纳斯卡和南美板块交界处的俯冲过程有关,其特征是复杂的震源机制,涉及两个主要凹凸不平的破裂,并向东南方向单侧破裂。破裂过程清楚地反映在该事件期间记录的地震动中,包括两个单独的强烈震动事件。该事件触发了18个加速度计站点;使用Scherbaum等人的基于最大似然法的方法,对记录的特征进行了检查,并与俯冲环境中地面运动预测方程的预测进行了比较。 (Bull Seismol Soc Am 94(6):2164-2185,2004)。此外,根据地震后的侦察任务收集的现场观测资料,结合当地的施工实践,对宏观地震观测资料和破坏模式进行了检查和讨论。

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