Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area
Do large caves exist deep underground? Through seismological investigations, we speculate the existence of a large geological cave about 7 km beneath the surface. The complete moment tensor inversion method (gCAP ) was used to analyze the ML4.7 earthquake that occurred in Rongchang District, Chongqi...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Reviews of Geophysics and Planetary Physics
2024-07-01
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| Series: | 地球与行星物理论评 |
| Subjects: | |
| Online Access: | https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2023-053 |
| _version_ | 1797215584976371712 |
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| author | Tingxiao Xue Liang Wang |
| author_facet | Tingxiao Xue Liang Wang |
| author_sort | Tingxiao Xue |
| collection | DOAJ |
| description | Do large caves exist deep underground? Through seismological investigations, we speculate the existence of a large geological cave about 7 km beneath the surface. The complete moment tensor inversion method (gCAP ) was used to analyze the ML4.7 earthquake that occurred in Rongchang District, Chongqing, on December 27, 2016. The complete moment tensor solution of its focal mechanism was obtained, and the waveform fitting was good. The inversion results showed that this relatively special earthquake had a thrust and collapse type source and that the earthquake centroid depth was 7 km. Based on the focal mechanism results and the fact that the earthquake was located near an anticlinal fold, we infer that this earthquake was attributable to thrusting of a fault in the anticlinal fold, which simultaneously led to destruction of the stability of the geological cavity in the fold, leading to collapse. The focal mechanism results showed that the seismic moment tensor had mainly a horizontal component with less vertical component, which is consistent with the local tectonic stress. The results indicate that the complete moment tensor of the focal mechanism inversion method is an effective means for studying complex earthquakes. In addition, shale gas drilling in this area is very deep and there are hydraulic fracturing operations, suggesting that earthquakes may be induced by the water injection pressure. |
| first_indexed | 2024-04-24T11:32:24Z |
| format | Article |
| id | doaj.art-c3c4532853d94ccdbee19b0b73d5afad |
| institution | Directory Open Access Journal |
| issn | 2097-1893 |
| language | zho |
| last_indexed | 2024-04-24T11:32:24Z |
| publishDate | 2024-07-01 |
| publisher | Editorial Office of Reviews of Geophysics and Planetary Physics |
| record_format | Article |
| series | 地球与行星物理论评 |
| spelling | doaj.art-c3c4532853d94ccdbee19b0b73d5afad2024-04-10T09:03:04ZzhoEditorial Office of Reviews of Geophysics and Planetary Physics地球与行星物理论评2097-18932024-07-0155446146810.19975/j.dqyxx.2023-0532023-053Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan areaTingxiao Xue0Liang Wang1School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, ChinaSchool of Artificial Intelligence, Hezhou University, Hezhou 542899, ChinaDo large caves exist deep underground? Through seismological investigations, we speculate the existence of a large geological cave about 7 km beneath the surface. The complete moment tensor inversion method (gCAP ) was used to analyze the ML4.7 earthquake that occurred in Rongchang District, Chongqing, on December 27, 2016. The complete moment tensor solution of its focal mechanism was obtained, and the waveform fitting was good. The inversion results showed that this relatively special earthquake had a thrust and collapse type source and that the earthquake centroid depth was 7 km. Based on the focal mechanism results and the fact that the earthquake was located near an anticlinal fold, we infer that this earthquake was attributable to thrusting of a fault in the anticlinal fold, which simultaneously led to destruction of the stability of the geological cavity in the fold, leading to collapse. The focal mechanism results showed that the seismic moment tensor had mainly a horizontal component with less vertical component, which is consistent with the local tectonic stress. The results indicate that the complete moment tensor of the focal mechanism inversion method is an effective means for studying complex earthquakes. In addition, shale gas drilling in this area is very deep and there are hydraulic fracturing operations, suggesting that earthquakes may be induced by the water injection pressure.https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2023-053rongchang earthquakefocal mechanismcollapsing of cave |
| spellingShingle | Tingxiao Xue Liang Wang Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area 地球与行星物理论评 rongchang earthquake focal mechanism collapsing of cave |
| title | Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area |
| title_full | Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area |
| title_fullStr | Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area |
| title_full_unstemmed | Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area |
| title_short | Seismological evidence for collapse of a deep geological cave—Focal mechanism of a thrust and collapse earthquake in a deep fold in the east Sichuan area |
| title_sort | seismological evidence for collapse of a deep geological cave focal mechanism of a thrust and collapse earthquake in a deep fold in the east sichuan area |
| topic | rongchang earthquake focal mechanism collapsing of cave |
| url | https://www.sjdz.org.cn/en/article/doi/10.19975/j.dqyxx.2023-053 |
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