Scholarlink

<p>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&#xa0;km from the Mesoamerican trench, where a strong ground shaking was felt during the <i>M</i><sub>w</sub>8.2 earthquake of September 08, 2017. In this study, for 20 sites shear-wave velocity profiles were determined using Multichannel Analysis of Surface Wave and <i>V</i><sub>P</sub> profiles using Seismic Refraction techniques. Also <i>V</i><sub><i>S30</i></sub> (shear-wave velocity up to a depth of 30&#xa0;m) values were obtained for the same sites. The distribution of the <i>V</i><sub><i>S30</i></sub> values in the study area varied from 120&#xa0;m/s to 570&#xa0;m/s and it was observed that sites where damage to buildings were reported lie near areas with <i>V</i><sub><i>S30</i></sub> &lt; 270&#xa0;m/s. Additionally, the transfer functions of the 20 sites were estimated using the Thomson-Haskell method. The fundamental frequencies (<i>f</i><sub>0</sub>) obtained through transfer functions had values varying from 0.9 ≤ <i>f</i><sub><i>0</i></sub> ≤ 2.0&#xa0;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 (<i>V</i><sub><i>s</i></sub>), low fundamental frequency (<i>f</i><sub><i>0</i></sub>), local site conditions, the presence of buildings on former lake zones, low seismic wave attenuation, and the regions’ overall vulnerability to regional earthquakes.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2025年1月7日

查看全文
  • Carmen Maricela Gómez-Arredondo,
  • Juan Carlos Montalvo-Arrieta,
  • Adalberto Rodríguez-Vázquez,
  • Daniel Andrés Damas-López,
  • Guillermo Chávez-Hernández

摘要

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.