地震地磁观测与研究2026，Vol.47Issue(1)：75-82,8.DOI:10.3969/j.issn.1003-3246.2026.01.010
依兰—伊通断裂带北段5次MS＞3.0地震前佳木斯水管倾斜仪异常变化特征
Abnormal variation characteristics of the water-tube tiltmeter observations at the Jiamusi Seismic Station before five MS＞3.0 earthquakes in the northern section of the Yilan-Yitong fault zone
摘要
Abstract
Reviewing DSQ-type water-tube tiltmeter observations from the Jiamusi Seismic Station since 2013,we found that the station experienced three typical annual change anomalies since 2021.The latter two anomalies corresponded to two groups(five events)of MS>3.0 earthquakes within an epicentral distance of 250 km,i.e.,Jiayin MS3.1,Luobei MS3.3,Jiayin MS3.5,Youyi MS3.6,and Tangwang MS3.5.Both anomalies were characterized by changes in annual variation,with the first anomaly showing the disappearance of annual variation and the second showing a reduction in its amplitude.The pre-earthquake tidal factor and loading-unloading response ratio also showed significant changes.All five earthquakes had a strike-slip mechanism,consistent with the fault activity in the region,suggesting that the primary driving force is the oblique subduction of the West Pacific Plate into the region.It is hypothesized that during the earthquake's development,stress caused deformation around the collision suture zone,leading to the NS direction tilt of the station's water-tube.Therefore,the deformation anomaly at the Jiamusi station can serve as a basis for predicting MS>3.0 earthquakes along the northern section of the Yilan-Yitong fault zone.关键词
地倾斜观测/MS3.0 地震/破年变异常/潮汐因子/加卸载响应比Key words
geodetic tilt observation/MS3.0 earthquake/annual anomaly/tidal factor/loading and unloading response ratio引用本文复制引用
刘长生,周晨,张思萌,郝永梅,马龙辰..依兰—伊通断裂带北段5次MS＞3.0地震前佳木斯水管倾斜仪异常变化特征[J].地震地磁观测与研究,2026,47(1):75-82,8.基金项目
黑龙江省地震局局内科研项目(项目编号:202412) （项目编号:202412）
