Evidence of soil amplification and damage in Centro, Tabasco, southern México due to distant large earthquakes

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Carmen Maricela Gómez-Arredondo, Juan Carlos Montalvo-Arrieta, Adalberto Rodríguez-Vázquez, Daniel Andrés Damas-López, Guillermo Chávez-Hernández
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Abstract

There are only a few worldwide cases where distant earthquakes have caused damage. One such example is the municipality of Centro located in Tabasco, Southeast Mexico, approximately 360 km from the Mesoamerican trench, where a strong ground shaking was felt during the Mw8.2 earthquake of September 08, 2017. In this study, for 20 sites shear-wave velocity profiles were determined using Multichannel Analysis of Surface Wave and VP profiles using Seismic Refraction techniques. Also VS30 (shear-wave velocity up to a depth of 30 m) values were obtained for the same sites. The distribution of the VS30 values in the study area varied from 120 m/s to 570 m/s and it was observed that sites where damage to buildings were reported lie near areas with VS30 < 270 m/s. Additionally, the transfer functions of the 20 sites were estimated using the Thomson-Haskell method. The fundamental frequencies (f0) obtained through transfer functions had values varying from 0.9 ≤ f0 ≤ 2.0 Hz. These transfer functions were convolved with the signal that represents the record in the bottom of the soil column in the study area to obtain synthetic accelerograms in the municipality of Centro. The only accelerograph station located in the study area (VHSA station) was used as a reference site. The horizontal-to-vertical spectral ratio of the VHSA location was used for site characterization to assess the effects of regional events. The study concludes that several factors contribute to the susceptibility of Centro municipality to distant seismic events. These factors include low shear-wave velocity (Vs), low fundamental frequency (f0), local site conditions, the presence of buildings on former lake zones, low seismic wave attenuation, and the regions’ overall vulnerability to regional earthquakes.

Abstract Image

由于遥远的大地震,墨西哥南部塔巴斯科的森特罗的土壤扩大和破坏的证据
在世界范围内,遥远的地震造成破坏的案例屈指可数。其中一个例子是位于墨西哥东南部塔巴斯科市的森特罗市,距离中美洲海沟约360公里,在2017年9月8日的Mw8.2地震中感受到强烈的地面震动。在这项研究中,使用多通道表面波分析和使用地震折射技术的VP剖面确定了20个站点的横波速度剖面。此外,还获得了同一地点的VS30(深度达30 m的横波速度)值。研究区VS30的分布范围在120 ~ 570 m/s之间,报告建筑物受损的地点靠近VS30 <; 270 m/s的区域。此外,利用Thomson-Haskell方法估计了20个位点的传递函数。通过传递函数得到的基频f0的取值范围为0.9≤f0≤2.0 Hz。这些传递函数与代表研究区域土壤柱底部记录的信号进行卷积,以获得森特罗市的合成加速度。研究区唯一的加速站(VHSA站)作为参考站点。VHSA位置的水平与垂直光谱比用于站点表征,以评估区域事件的影响。研究得出结论,有几个因素导致了森特罗市对遥远地震事件的敏感性。这些因素包括低横波速度(Vs)、低基频(f0)、当地场地条件、前湖区存在建筑物、低地震波衰减以及该地区对区域地震的整体脆弱性。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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