Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station
Since its installation, the VP broadband tiltmeter at Chengde station has exhibited a long-term trend of northward tilt along the north-south (NS) axis and westward tilt along the east-west (EW) axis. However, during July to August 2021, both components showed a marked acceleration in tilting, with...
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Editorial Office of Progress in Earthquake Sciences
2025-08-01
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| Series: | 地震科学进展 |
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| Online Access: | https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2024-134 |
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| author | Yaya Guo Keliang Zhang Yulin Zhang Junfeng Ren Donghui Yang |
| author_facet | Yaya Guo Keliang Zhang Yulin Zhang Junfeng Ren Donghui Yang |
| author_sort | Yaya Guo |
| collection | DOAJ |
| description | Since its installation, the VP broadband tiltmeter at Chengde station has exhibited a long-term trend of northward tilt along the north-south (NS) axis and westward tilt along the east-west (EW) axis. However, during July to August 2021, both components showed a marked acceleration in tilting, with rates approximately four times higher than the long-term average. During the same period, the nearby Shuangfengsi reservoir, located about 10 km northeast of the station, was being filled and reached its maximum water level on August 24, 2021. This study analyzes the correlation between the inclinometer data and changes in reservoir capacity and further quantifies the resulting crustal deformation using a non-uniform surface load model. Correlation analysis revealed a strong relationship between variation in the VP broadband tiltmeter data and changes in reservoir capacity. Model calculations indicated that the reservoir filling resulted in a maximum crustal subsidence of 0.4421 mm, with corresponding northward tilt of 0.1179 mm and eastward tilt of 0.0882 mm. These values are consistent with the observations recorded by the VP broadband tiltmeter. A similarly strong correlation was also observed between the tiltmeter data and reservoir capacity changes in 2022. The findings suggest that recent annual variation trends observed by the VP broadband tiltmeter at Chengde station are primarily attributable to loading effects from the Shuangfengsi reservoir. By quantitatively comparing modeled ground tilt induced by reservoir impoundment with the tiltmeter observations, this study effectively rules out tectonic origins such as earthquake precursors. These results help prevent potential misinterpretation of the data and provide a valuable example of how non-tectonic influences should be considered in the anomaly analysis used for earthquake forecasting. |
| format | Article |
| id | doaj-art-dc79ffee81f5495cbccae4e9d6f60b06 |
| institution | DOAJ |
| issn | 2096-7780 |
| language | zho |
| publishDate | 2025-08-01 |
| publisher | Editorial Office of Progress in Earthquake Sciences |
| record_format | Article |
| series | 地震科学进展 |
| spelling | doaj-art-dc79ffee81f5495cbccae4e9d6f60b062025-08-20T02:47:03ZzhoEditorial Office of Progress in Earthquake Sciences地震科学进展2096-77802025-08-0155846347110.19987/j.dzkxjz.2024-1342024-134Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde stationYaya Guo0Keliang Zhang1Yulin Zhang2Junfeng Ren3Donghui Yang4Chengde Earthquake Monitoring Center Station, Hebei Chengde 067000, ChinaInstitute of Geology, China Earthquake Administration, Beijing100029, ChinaChengde Earthquake Monitoring Center Station, Hebei Chengde 067000, ChinaChengde Earthquake Monitoring Center Station, Hebei Chengde 067000, ChinaChengde Earthquake Monitoring Center Station, Hebei Chengde 067000, ChinaSince its installation, the VP broadband tiltmeter at Chengde station has exhibited a long-term trend of northward tilt along the north-south (NS) axis and westward tilt along the east-west (EW) axis. However, during July to August 2021, both components showed a marked acceleration in tilting, with rates approximately four times higher than the long-term average. During the same period, the nearby Shuangfengsi reservoir, located about 10 km northeast of the station, was being filled and reached its maximum water level on August 24, 2021. This study analyzes the correlation between the inclinometer data and changes in reservoir capacity and further quantifies the resulting crustal deformation using a non-uniform surface load model. Correlation analysis revealed a strong relationship between variation in the VP broadband tiltmeter data and changes in reservoir capacity. Model calculations indicated that the reservoir filling resulted in a maximum crustal subsidence of 0.4421 mm, with corresponding northward tilt of 0.1179 mm and eastward tilt of 0.0882 mm. These values are consistent with the observations recorded by the VP broadband tiltmeter. A similarly strong correlation was also observed between the tiltmeter data and reservoir capacity changes in 2022. The findings suggest that recent annual variation trends observed by the VP broadband tiltmeter at Chengde station are primarily attributable to loading effects from the Shuangfengsi reservoir. By quantitatively comparing modeled ground tilt induced by reservoir impoundment with the tiltmeter observations, this study effectively rules out tectonic origins such as earthquake precursors. These results help prevent potential misinterpretation of the data and provide a valuable example of how non-tectonic influences should be considered in the anomaly analysis used for earthquake forecasting.https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2024-134shuangfengsi reservoirtilt observationwater storage loadcrustal deformation |
| spellingShingle | Yaya Guo Keliang Zhang Yulin Zhang Junfeng Ren Donghui Yang Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station 地震科学进展 shuangfengsi reservoir tilt observation water storage load crustal deformation |
| title | Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station |
| title_full | Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station |
| title_fullStr | Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station |
| title_full_unstemmed | Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station |
| title_short | Impact of the Shuangfengsi reservoir on VP broadband tiltmeter observations at Chengde station |
| title_sort | impact of the shuangfengsi reservoir on vp broadband tiltmeter observations at chengde station |
| topic | shuangfengsi reservoir tilt observation water storage load crustal deformation |
| url | https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2024-134 |
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