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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Bibliographic Details
Published in地震科学进展 Vol. 55; no. 8; pp. 463 - 471
Main Authors Yaya Guo, Keliang Zhang, Yulin Zhang, Junfeng Ren, Donghui Yang
Format Journal Article
LanguageChinese
Published Editorial Office of Progress in Earthquake Sciences 01.08.2025
Subjects
crustal deformation
shuangfengsi reservoir
tilt observation
water storage load
Online AccessGet full text
ISSN2096-7780
DOI10.19987/j.dzkxjz.2024-134

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Summary: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 til
ISSN:2096-7780
DOI:10.19987/j.dzkxjz.2024-134