Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points
Seismic attenuation is a fundamental property of the Earth's media. Attenuation structure for the complicated geological structures with strong seismicity in the Sichuan-Yunnan region is poorly studied. In this study, we collected 108,399 waveforms of 11,517 local small earthquakes with magnitu...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2024-02-01
|
| Series: | Earthquake Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674451923000587 |
| _version_ | 1827367374806843392 |
|---|---|
| author | Tian Li Lei Zhang Xiaodong Song Qincai Wang Xinyu Jiang Jinchuan Zhang Hanlin Chen |
| author_facet | Tian Li Lei Zhang Xiaodong Song Qincai Wang Xinyu Jiang Jinchuan Zhang Hanlin Chen |
| author_sort | Tian Li |
| collection | DOAJ |
| description | Seismic attenuation is a fundamental property of the Earth's media. Attenuation structure for the complicated geological structures with strong seismicity in the Sichuan-Yunnan region is poorly studied. In this study, we collected 108,399 waveforms of 11,517 local small earthquakes with magnitudes between 1.5 and 3.5 from January 2014 to September 2021 in the Sichuan-Yunnan region and its adjacent areas. We employed an envelope inversion technique for separating the intrinsic and scattering attenuations of the S coda wave, and obtained the intrinsic and scattering attenuation structures for frequencies between 0.25 and 8.00 Hz. The attenuation structures correlate well with the geological units, and some major faults mark the attenuation variations where historic large earthquakes have occurred. The regional average attenuation shows a negative frequency dependence. The average scattering attenuation has a faster descending rate than the average intrinsic attenuation, and is dominant at low frequencies, while at high frequencies the average intrinsic attenuation is stronger. The lateral variation in the intrinsic attenuation is consistent with the variation in heat flow, the scattering attenuation may be related to the scatter distribution and size. The total attenuation is consistent with the previous studies in this region, and the separate intrinsic and scattering attenuation may be useful in understanding regional tectonics and important in earthquake prevention and disaster reduction. |
| first_indexed | 2024-03-08T09:04:41Z |
| format | Article |
| id | doaj.art-a74d213760344d9f93f927d0ab52be6a |
| institution | Directory Open Access Journal |
| issn | 1867-8777 |
| language | English |
| last_indexed | 2024-03-08T09:04:41Z |
| publishDate | 2024-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Earthquake Science |
| spelling | doaj.art-a74d213760344d9f93f927d0ab52be6a2024-02-01T06:29:47ZengKeAi Communications Co., Ltd.Earthquake Science1867-87772024-02-013715166Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey pointsTian Li0Lei Zhang1Xiaodong Song2Qincai Wang3Xinyu Jiang4Jinchuan Zhang5Hanlin Chen6SinoProbe Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Peking University, Beijing 100871, ChinaSinoProbe Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Peking University, Beijing 100871, ChinaSinoProbe Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Peking University, Beijing 100871, China; Corresponding author.Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China; Corresponding author.SinoProbe Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Peking University, Beijing 100871, ChinaEarthquake Agency of Jiangsu Province, Nanjing 210014, ChinaInstitute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, ChinaSeismic attenuation is a fundamental property of the Earth's media. Attenuation structure for the complicated geological structures with strong seismicity in the Sichuan-Yunnan region is poorly studied. In this study, we collected 108,399 waveforms of 11,517 local small earthquakes with magnitudes between 1.5 and 3.5 from January 2014 to September 2021 in the Sichuan-Yunnan region and its adjacent areas. We employed an envelope inversion technique for separating the intrinsic and scattering attenuations of the S coda wave, and obtained the intrinsic and scattering attenuation structures for frequencies between 0.25 and 8.00 Hz. The attenuation structures correlate well with the geological units, and some major faults mark the attenuation variations where historic large earthquakes have occurred. The regional average attenuation shows a negative frequency dependence. The average scattering attenuation has a faster descending rate than the average intrinsic attenuation, and is dominant at low frequencies, while at high frequencies the average intrinsic attenuation is stronger. The lateral variation in the intrinsic attenuation is consistent with the variation in heat flow, the scattering attenuation may be related to the scatter distribution and size. The total attenuation is consistent with the previous studies in this region, and the separate intrinsic and scattering attenuation may be useful in understanding regional tectonics and important in earthquake prevention and disaster reduction.http://www.sciencedirect.com/science/article/pii/S1674451923000587Intrinsic attenuationscattering attenuationSichuan-Yunnan region |
| spellingShingle | Tian Li Lei Zhang Xiaodong Song Qincai Wang Xinyu Jiang Jinchuan Zhang Hanlin Chen Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points Earthquake Science Intrinsic attenuation scattering attenuation Sichuan-Yunnan region |
| title | Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points |
| title_full | Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points |
| title_fullStr | Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points |
| title_full_unstemmed | Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points |
| title_short | Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda wavesKey points |
| title_sort | intrinsic and scattering attenuations of the sichuan yunnan region in china from s coda waveskey points |
| topic | Intrinsic attenuation scattering attenuation Sichuan-Yunnan region |
| url | http://www.sciencedirect.com/science/article/pii/S1674451923000587 |
| work_keys_str_mv | AT tianli intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT leizhang intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT xiaodongsong intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT qincaiwang intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT xinyujiang intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT jinchuanzhang intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints AT hanlinchen intrinsicandscatteringattenuationsofthesichuanyunnanregioninchinafromscodawaveskeypoints |