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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

期数:

2025年04期

页码:

584-593

栏目:

重力场及其变化观测与地球科学应用专辑

出版日期:

2025-05-01

文章信息/Info

Title:

Exploration of the Relationship between the Gravity Field Changes and the Gravity Anomalies in the Middle-southern Section of the Tancheng-Lujiang Fault Zone

作者:

孙鸿博¹; 2; 梁霄¹; 2; 王季雨¹; 2; 肖伟鹏¹; 2; 陆元超¹; 2; 孙伯乐¹; 2; 严吉¹; 2; 周志¹; 2; 徐如刚¹; 2; 储飞¹; 2

(1.安徽省地震局,安徽 合肥 230031; 2.安徽省地下结构探测与震灾风险防范重点实验室(筹),安徽 合肥 230031)

Author(s):

SUN Hongbo¹; 2; LIANG Xiao¹; 2; WANG Jiyu¹; 2; XIAO Weipeng¹; 2; LU Yuanchao¹; 2; SUN Bole¹; 2; YAN JI¹; 2; ZHOU Zhi¹; 2; XU Rugang¹; 2; CHU Fei¹; 2

(1.Anhui Earthquake Agency,Hefei 230031,Anhui,China)(2.Anhui Key Laboratory of Subsurface Exploration and Earthquake Hazard RiskPrevention(in prep.),Hefei 230031,Anhui,China)

关键词:

重力场变化;  贝叶斯平差;  郯庐断裂带;  布格重力异常;  小波分解

Keywords:

gravity field variation;  the Bayesian adjustment;  the Tancheng-Lujiang Fault Zone;  the Bouguer gravity anomaly;  wavelet decomposition

分类号:

P312.11

DOI:

10.20015/j.cnki.ISSN1000-0666.2025.0059

摘要:

使用经典平差和贝叶斯平差法对2013年上下半年、2020年上下半年以及2024年郯庐断裂带中南段的重力数据进行平差处理,获得了2013—2024年研究区的重力场变化。结果显示,该研究区的重力场呈现东升西降的变化趋势,郯庐断裂带对重力变化控制明显。结合对重力场变化的小波分解结果和2013—2022年研究区发生的M_S≥3.5地震,发现地震易发生在重力场变化的正负交界过渡带上。采用EGM2008模型,经小波多尺度分解,获得去除了莫霍面起伏影响的布格重力异常,根据 Airy 均衡模型计算得到均衡重力异常。结果表明,总体上重力场的变化与重力异常在空间形态上较为一致,但变化趋势可能有所不同,需重点关注重力异常的边界与重力场变化的边界一致的地方,有发生地震的可能性。

Abstract:

We select the gravity data measured in the middle and southern section of the Tancheng-Lujiang Fault Zone in the year 2013,2020,and 2024 for adjustment processing,and obtain the gravity variation in the study from 2013 to 2024.The results show that the gravity field variation has a trend of rising in the east part and falling in the west part of the study area,and the Tancheng-Lujiang Fault Zone significantly controls the gravity variation.Further,we decompose the gravity field variation with wavelet analysis.Referring to the recent earthquake cases(M≥4.0)in the study area,we find that these earthquakes are prone to occuring in the transitional zones between the positive variation and the negative variation of the gravity field.We use the EGM2008 model to do the wavelet multiscale decomposition,and obtain the Bouguer gravity anomaly without the influence of the Moho surface undulation.Finally,we calculate the isostatic gravity anomaly by the Airy equilibrium model.We find that the gravity field variation is generally consistent with the shape of gravity anomalies.The positive and negative areas of the gravity field may be opposite to the areas of the isostatic gravity anomalies,but the spatial range of abnormal variation of the gravity field is consistent with the spatial range of the isostatic gravity anomalies.As the earthquake prone areas,these spatial ranges need to be paid more attention to.

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备注/Memo

备注/Memo:

收稿日期:2024-10-29.
基金项目:安徽省地下结构探测与震灾风险防范重点实验室(筹)开放基金(KLB-2025KFQN-004).
第一作者简介:孙鸿博(1985-),工程师,主要从事跨断层水准、重力、流动地磁和跨断层土壤气的数据采集及分析工作.E-mail:33840828@qq.com.
通信作者简介:梁 霄(1991-),工程师,主要从事重力、跨断层水准及流动地磁的数据采集及分析工作.E-mail:lx1068@126.com.

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更新日期/Last Update: 2025-05-01