首页> 外文OA文献 >An Overview of the Damaging and Low Magnitude Mw 4.8 La PacaudEarthquake on 29 January 2005: Context, Seismotectonics, andudSeismic Risk Implications for Southeast Spain
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An Overview of the Damaging and Low Magnitude Mw 4.8 La PacaudEarthquake on 29 January 2005: Context, Seismotectonics, andudSeismic Risk Implications for Southeast Spain

机译:Mw 4.8 La Paca ud的破坏性和低幅值概述2005年1月29日地震:背景,地震构造和 ud西班牙东南部的地震风险隐患

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摘要

This article presents an overview of the La Paca earthquake of magnitudeudmbLg 4.7, which occurred on 29 January 2005, with its epicenter located nearudthe town of Avile´s in the Murcia region in southeast Spain. Despite its low magnitude,udthe earthquake caused important damage in two towns of the epicentral area, La Pacaudand Zarcilla de Ramos. These areas recorded intensities of VI–VII (EuropeanudMacroseismic Scale, 1998) and sustained estimated economic losses amounting toud10 million €. Aftershocks continued for more than 2 weeks, producing considerableudalarm in the population and mobilizing emergency services from the whole region.udThe La Paca seismic series is the third registered in the region in the past 8 years,udbeing preceded by the Mula (1999) and southwest Bullas (2002) seismic series. Theseudmain events had also low magnitudes (mbLg 4.8) and caused damage levels similarudto the 2005 earthquake. The case is an example of a moderate seismic zone whereudlow-magnitude and frequent earthquakes have important implications on the seismicudhazard and risk of the region. Although these are not the largest expected earthquakes,udthey have yielded important information for improving the knowledge of the seismicudactivity of the area. With this aim in mind, different topics have been analyzed fromuda multidisciplinary perspective, including seismicity, local tectonics and surface geology,udfocal mechanisms, macroseismic effects, and ground motion. Results indicateuda local tectonic interpretation, consistent with a strike-slip focal mechanism, theudconfirmation of a triggering process between the 2002 and 2005 earthquakes, a geotechnicaludand ground-motion characterization for the damaged sites (supporting localudamplification effects and estimated peak ground acceleration values of �0.1g), andudan understanding of damage patterns in relation to local building trends. The resultsudmay be used as guidelines for future revisions of the Spanish Building Code (Normaudde la Construccio´n Sismorresistente Espan˜ola [NCSE-02], 2002). The study resultsudshould contribute to risk mitigation in a region where strong-motion records fromudthe maximum expected earthquakes are not available. This approach can be extendedudto other regions with similar seismic backgrounds and a lack of strong-motionudrecords.
机译:本文概述了2005年1月29日发生的拉帕卡4.7级地震,震中位于西班牙东南部穆尔西亚地区的艾维利镇附近。尽管震级较低,但地震在震中地区的两个城镇拉帕卡乌德和扎尔西拉德拉莫斯造成了严重破坏。这些地区的强度为六至七级(欧洲 udMacroseismic规模,1998年),持续的经济损失估计为 ud1000万欧元。余震持续了超过2周,在整个人口中产生了可观的 udalarm,并动员了整个地区的紧急服务。 udLa Paca地震系列是该地区过去8年中第三次登记, mula之前( 1999年)和西南大地震(2002年)。这些主震事件的震级也很低(mbLg 4.8),造成的破坏水平与2005年地震类似。该案例是中度地震带的一个例子,其中低震级和频繁地震对该地区的地震超灾变和风险具有重要影响。尽管这些地震不是预期的最大地震,但它们已经为提高对该地区地震/放射性的认识提供了重要信息。考虑到这一目标,已从多学科角度分析了不同的主题,包括地震活动性,局部构造和地表地质,共聚焦机制,宏观地震效应和地震动。结果表明 uda局部构造解释,与走滑震源机制一致,对2002年至2005年地震之间触发过程的确认,对受损地点的岩土 udand地面运动特征(支持局部 umplification效应和估计的地面加速度峰值为0.1g),并且 u n了解与当地建筑趋势相关的损坏模式。结果 ud可用作将来修订《西班牙建筑规范》的指南(Norma udde la Construccio´n Sismorresistente Espanola [NCSE-02],2002年)。研究结果应有助于在没有最大预期地震的强震记录的地区减轻风险。这种方法可以扩展到具有类似地震背景并且缺乏强运动记录的其他地区。

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