Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses
In an effort to investigate the attenuation characteristics and site effects in eastern Guangdong, 659 strong-motion recordings received by 27 stations were selected for spectral analysis to separate path attenuation, site effects and source spectra. The path attenuation curves are generally close t...
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1091785/full |
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| author | Huadeng Wu Huadeng Wu Huadeng Wu Huadeng Wu Ying Zhou Yongmei Qian Fang Yang Gang Yu Gang Yu Gang Yu Gang Yu Guorui Wu Yi Zhang Yi Zhang Yi Zhang Yi Zhang |
| author_facet | Huadeng Wu Huadeng Wu Huadeng Wu Huadeng Wu Ying Zhou Yongmei Qian Fang Yang Gang Yu Gang Yu Gang Yu Gang Yu Guorui Wu Yi Zhang Yi Zhang Yi Zhang Yi Zhang |
| author_sort | Huadeng Wu |
| collection | DOAJ |
| description | In an effort to investigate the attenuation characteristics and site effects in eastern Guangdong, 659 strong-motion recordings received by 27 stations were selected for spectral analysis to separate path attenuation, site effects and source spectra. The path attenuation curves are generally close to the simplest form of distance decay described by R−0.5, and decays the slowest at a frequency of 4 Hz. We decomposed the path attenuation into a combination of geometric spreading and inelastic attenuation. The geometric spreading R−0.15 exhibits a slower distance decay at local distances, indicating that the seismic energy close to the epicenter is not easily dissipated. The quality factors were regressed as Qs(f) = 114.81f.922 in the frequency range .9–20 Hz, lower than those reported for the whole Guangdong region, indicating stronger anelastic attenuation in eastern Guangdong. The site responses in eastern Guangdong show a strong correlation with geological and geotechnical characterization. The stations located in the central mountains have higher predominant frequencies (>10 Hz) accompanied by smaller site amplifications. Larger site amplification is in the southeast coastal area (i.e., Shantou area), where the surface is covered with a thicker layer of soft soil and the predominant frequency of site is relatively low (∼2 Hz). The far-field earthquake will cause greater vibration and damage to this area. |
| first_indexed | 2024-04-10T21:28:20Z |
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| id | doaj.art-4decdee99e8c4c2888527bfc4741b30a |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-10T21:28:20Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-4decdee99e8c4c2888527bfc4741b30a2023-01-19T15:06:24ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011110.3389/feart.2023.10917851091785Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analysesHuadeng Wu0Huadeng Wu1Huadeng Wu2Huadeng Wu3Ying Zhou4Yongmei Qian5Fang Yang6Gang Yu7Gang Yu8Gang Yu9Gang Yu10Guorui Wu11Yi Zhang12Yi Zhang13Yi Zhang14Yi Zhang15Guangdong Province Earthquake Agency, Guangzhou, ChinaGuangdong Science and Technology Collaborative Innovation Center for Earthquake, Prevention and Disaster Mitigation, Guangzhou, ChinaKey Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangzhou, ChinaKey Laboratory of Guang Dong Province, Earthquake Early Warning and Safety Diagnosis of Major Projects, Guangzhou, ChinaSchool of Civil Engineering, Jilin Jianzhu University, Changchun, ChinaSchool of Civil Engineering, Jilin Jianzhu University, Changchun, ChinaGuangdong Province Earthquake Agency, Guangzhou, ChinaGuangdong Province Earthquake Agency, Guangzhou, ChinaGuangdong Science and Technology Collaborative Innovation Center for Earthquake, Prevention and Disaster Mitigation, Guangzhou, ChinaKey Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangzhou, ChinaKey Laboratory of Guang Dong Province, Earthquake Early Warning and Safety Diagnosis of Major Projects, Guangzhou, ChinaGuangdong Province Earthquake Agency, Guangzhou, ChinaGuangdong Province Earthquake Agency, Guangzhou, ChinaGuangdong Science and Technology Collaborative Innovation Center for Earthquake, Prevention and Disaster Mitigation, Guangzhou, ChinaKey Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangzhou, ChinaKey Laboratory of Guang Dong Province, Earthquake Early Warning and Safety Diagnosis of Major Projects, Guangzhou, ChinaIn an effort to investigate the attenuation characteristics and site effects in eastern Guangdong, 659 strong-motion recordings received by 27 stations were selected for spectral analysis to separate path attenuation, site effects and source spectra. The path attenuation curves are generally close to the simplest form of distance decay described by R−0.5, and decays the slowest at a frequency of 4 Hz. We decomposed the path attenuation into a combination of geometric spreading and inelastic attenuation. The geometric spreading R−0.15 exhibits a slower distance decay at local distances, indicating that the seismic energy close to the epicenter is not easily dissipated. The quality factors were regressed as Qs(f) = 114.81f.922 in the frequency range .9–20 Hz, lower than those reported for the whole Guangdong region, indicating stronger anelastic attenuation in eastern Guangdong. The site responses in eastern Guangdong show a strong correlation with geological and geotechnical characterization. The stations located in the central mountains have higher predominant frequencies (>10 Hz) accompanied by smaller site amplifications. Larger site amplification is in the southeast coastal area (i.e., Shantou area), where the surface is covered with a thicker layer of soft soil and the predominant frequency of site is relatively low (∼2 Hz). The far-field earthquake will cause greater vibration and damage to this area.https://www.frontiersin.org/articles/10.3389/feart.2023.1091785/fullearthquake ground motionsspectral analysispath attenuationsite responseeastern Guangdong |
| spellingShingle | Huadeng Wu Huadeng Wu Huadeng Wu Huadeng Wu Ying Zhou Yongmei Qian Fang Yang Gang Yu Gang Yu Gang Yu Gang Yu Guorui Wu Yi Zhang Yi Zhang Yi Zhang Yi Zhang Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses Frontiers in Earth Science earthquake ground motions spectral analysis path attenuation site response eastern Guangdong |
| title | Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses |
| title_full | Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses |
| title_fullStr | Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses |
| title_full_unstemmed | Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses |
| title_short | Seismic-wave path attenuation and local site responses in eastern Guangdong province revealed by the ground-motion spectral analyses |
| title_sort | seismic wave path attenuation and local site responses in eastern guangdong province revealed by the ground motion spectral analyses |
| topic | earthquake ground motions spectral analysis path attenuation site response eastern Guangdong |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1091785/full |
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