利用remi技术在Setúbal县(葡萄牙)的地震现场效果

Henrique Vicêncio , Paula Teves-Costa , Paulo Sá Caetano
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引用次数: 1

摘要

Setúbal是位于里斯本大都市区(葡萄牙)的一个县,历史上遭受地震袭击,造成了巨大的社会和经济损失。1858年的地震,震中位于Setúbal地区南部的海上,是一个很好的例子,地震给这个县造成了很高的破坏(IX-VIII MM)。该地区的主要城市是Setúbal,这是一个重要的人口稠密的城市群,附近有几个工业设施。老城区中心大多位于浅层地质单元上,考虑到历史上的地震活动,重要的是要检查未来地震影响Setúbal地区时可能发生的场地影响。因此,这项研究的目的是描述塞图巴尔浅层地质构造的地震行为,并评估潜在的场地影响。利用折射微震(Refraction Microtremor, ReMi)方法计算了剪切波速剖面,估计了VS30值的空间分布,并根据EC8建立了VS30土壤分类图。介绍并讨论了不同数据的空间分布:VS30值、浅层地层厚度、上新世顶部表面和标准侵透试验(NSPT)值。建立了这些参数之间的数值相关性。岩土工程特征是基于对307条测井曲线和2950个标准渗透试验的分析。共进行了266次折射微震测量,获得43个不同地点的VS剖面和VS30值。结果表明:Setúbal地区全新世单元大部分属于EC8 C类(180 ~ 360 m/s),而在浅地层厚度较低的地区,全新世单元可能属于B类(>360米/秒)。v30的空间分布表明,上新世-更新世、中新世和中生代地区土壤条件最佳,对应于EC8 B类和a类,但有可能确定上新世-更新世地区的v30在232 ~ 355 m/s之间,因此属于c类。这一事实表明,场地效应研究不应仅根据地质标准进行,而必须就地估计s波速。
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Seismic site effects in Setúbal county (Portugal) using remi technique

Setúbal is a county located in the Lisbon metropolitan area (Portugal) which has been hit by historical earthquakes that were responsible for high social and economic losses. The 1858 earthquake, with an epicentre located offshore just south of the Setúbal region, is a good example of an earthquake that caused high damage (IX-VIII MM) in this county. The main city of the region is Setúbal itself, an important and populated urban agglomeration with several industrial facilities very close by. The old city centre is mostly settled upon shallow geological units and taking into consideration the historical seismicity, it is important to examine the possible site effects that could occur during future earthquakes affecting the Setúbal region.

The objectives of this study are therefore the characterisation of the seismic behaviour of Setubal's shallow geological formations and the evaluation of potential site effects. Shear wave velocity profiles were computed with the Refraction Microtremor (ReMi) method, spatial distribution of VS30 values was estimated and a map with the VS30 classification of soils according to the EC8 was produced. Spatial distributions of different data are presented and discussed: VS30 values, thickness of the shallow formations, top Pliocene surface, and results from Standard Penetration Tests (NSPT values). Numerical correlations between these parameters were established. Geotechnical characterisation was based on the analysis of 307 logs and 2950 Standard Penetration Tests. A total of 266 refraction microtremor measurements were performed obtaining VS profiles and VS30 values for 43 different sites. It was found that in Setúbal the majority of the Holocene units belong to EC8 class C (180–360 m/s) but, in the areas where the thickness of shallow formations (TSF) is lower, the Holocene units may belong to class B (> 360 m/s). The spatial distribution of VS30 highlighted that the Plio-Pleistocene, Miocene and Mesozoic areas show the best soil conditions corresponding to EC8 classes B and A. However, it was possible to identify a Plio-Pleistocene area with VS30 varying between 232 and 355 m/s, therefore belonging to class C. This fact highlights that site effects studies should not be performed solely based on geological criteria, but it is essential to estimate S wave velocities (VS) in situ.

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