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首页> 外文期刊>Natural Hazards >The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions
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The catastrophic 1883 earthquake at the island of Ischia (southern Italy): macroseismic data and the role of geological conditions

机译：伊斯基亚岛（意大利南部）的1883年灾难性地震：宏观地震数据和地质条件的作用

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摘要

This article presents the results of a detailed study of the effects of the 1883 earthquake, which occurred at the island of Ischia (Gulf of Naples) and produced the total destruction of buildings in the epicentral area (Casamicciola town). Despite the moderate magnitude, this event was characterised by very high intensities (I max = XI degree MCS) mainly due to the shallow depth of the source. The study of the earthquake shows that the intensities, which decreased rapidly with distance, were affected by source directivity, according to the causative fault geometry and tectonic structures, while local amplification of damage was observed where soft soils outcrop. The attenuation of seismic intensity with distance was evaluated using the well-known relation of intensity versus epicentral distance (Blake’s method). The diverse gradients of attenuation, observed in different directions, were ascribed to the various geological features of the shallow crust of the island. In order to evaluate the role of geology in the damage level, we computed different attenuation models for stiff and soft soils outcropping on the island. A systematic local amplification of about 1 MCS degree associated to the presence of reworked tuffs was obtained. This study also shows the influence of geological conditions on the evaluation of macroseismic data and supplies useful elements to derive a predictive map of potential site effects. Keywords Ischia island - 1883 Earthquake - Macroseismic data - Site effects - Geological conditions - MCS intensity - Historical seismicity - Attenuation law An erratum to this article can be found at http://dx.doi.org/10.1007/s11069-009-9387-y
机译：本文介绍了对1883年地震的详细研究结果，该地震发生在伊斯基亚岛（那不勒斯海湾），并造成了震中地区（卡萨米乔拉镇）建筑物的全部破坏。尽管幅度适中，但该事件的特征是强度很高（I max = XI度MCS），这主要是由于震源深度较浅。对地震的研究表明，强度随距离的增加而迅速下降，这取决于震源断层的几何形状和构造结构，而受震源方向性的影响，而在软土露头处则观察到了局部破坏。地震强度随距离的衰减是使用众所周知的强度与震中距离的关系来评估的（Blake方法）。在不同方向上观察到的不同的衰减梯度归因于该岛浅层地壳的各种地质​​特征。为了评估地质在破坏程度中的作用，我们计算了岛上硬土和软土露头的不同衰减模型。获得了与返工凝灰岩的存在相关的约1 MCS度的系统局部扩增。这项研究还显示了地质条件对宏观地震数据评估的影响，并提供了有用的元素来推导潜在站点影响的预测图。关键词伊斯基亚岛-1883年地震-宏观地震数据-场地影响-地质条件-MCS强度-历史地震性-衰减定律可以在http://dx.doi.org/10.1007/s11069-009-9387中找到本文的勘误-y

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