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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Assessing Seismic Damage Through Stochastic Simulation of Ground Shaking: The Case of the 1998 Faial Earthquake (Azores Islands)
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Assessing Seismic Damage Through Stochastic Simulation of Ground Shaking: The Case of the 1998 Faial Earthquake (Azores Islands)

机译：通过随机模拟的地震动评估震害：以1998年Faial地震为例（亚速尔群岛）

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摘要

In July 1998, an M (w) = 6.2 earthquake struck the islands of Faial, Pico and San Jorge (in the Azores Archipelago), registering VIII on the Modified Mercalli Intensity scale and causing major destruction in the northeastern part of Faial. The main shock was located offshore, 8 km North East of the island, and it triggered a seismic sequence that lasted for several weeks. The existing data for this earthquake include both the general tectonic environment of the region and the teleseismic information. This is accompanied by one strong-motion record obtained 15 km from the epicentre, the epicentre location of aftershocks, and a large collection of the damage inflicted to the building stock (as poor rubble masonry, of 2-3 storeys). The present study was carried out in two steps: first, with a finite-fault stochastic simulation method of ground motion at sites throughout the affected islands, for two possible locations of the rupturing fault and for a large number of combinations of rupture mechanisms (as a parametric analysis); secondly, the damage to buildings was modelled using a well-known macroseismic method that considers the building typologies and their associated vulnerabilities. The main intent was to integrate different data (geological, seismological and building features) to produce a scenario model to reproduce and justify the level of damage generated during the Faial earthquake. Finally, through validation of the results provided by these different approaches, we obtained a complete procedure for the parameters of a first model for the production of seismic damage scenarios for the Azores Islands region.
机译：1998年7月，M（w）= 6.2级地震袭击了Faial，Pico和San Jorge群岛（亚速尔群岛），在修正的Mercalli强度等级上进行了VIII记录，并在Faial的东北部造成了严重破坏。主要地震发生在离岛东北部8公里处的海上，并引发了持续数周的地震序列。该地震的现有数据包括该地区的总体构造环境和远震信息。这还伴随着一份从震中起15公里处，余震震中位置以及大量对建筑物造成的破坏的记录（作为瓦砾砌体，为2-3层）。本研究分两个步骤进行：首先，在整个受影响岛屿的站点上，使用有限断层随机随机模拟方法对破裂断层的两个可能位置以及大量破裂机制进行组合（如参数分析）;其次，使用众所周知的宏观地震方法对建筑物的破坏进行建模，该方法考虑了建筑物的类型及其相关的脆弱性。其主要目的是整合不同的数据（地质，地震和建筑特征）以生成一种情景模型，以重现并证明Faial地震期间产生的破坏程度。最后，通过验证这些不同方法提供的结果，我们获得了用于制作亚速尔群岛地区地震破坏情景的第一个模型参数的完整程序。

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