基于数字化水位的琼东北地区构造应力场时序特征分析  

Temporal characteristics of the tectonic stress field of northeast Hainan based on digital water level

作　　者：解晓静[1] 张艺潇 张帆[1] 李盛[1] 郑在壮[1] Xie Xiaojing;Zhang Yixiao;Zhang Fan;Li Sheng;Zheng Zaizhuang(Hainan Earthquake Agency,Hainan Haikou 570203,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]海南省地震局,海南海口570203 [2]中国地震局地球物理研究所,北京100081

出　　处：《地震科学进展》2022年第3期110-119,共10页Progress in Earthquake Sciences

基　　金：2021年度中国地震局监测、预报、科研三结合课题(3JH-2021038)资助。

摘　　要：选取琼东北地区2008年以来连续稳定、潮汐形态较明显的海口ZK26井、琼海加积井、向荣村井、火山流体井、文昌潭牛井5口井数字化水位及相应的气压资料。利用气压系数和O_(1)、M_(2)波潮汐因子等滑动拟合,得到不排水状态下,各井含水层的孔隙度、固体骨架的体积压缩系数和水的体积压缩系数。并在水平层状含水层(一维)模式下,利用部分含水层介质参数(孔隙度、水和固体骨架的体积压缩系数)、井水位变化量与含水层垂直向应力变化量的关系式,定量分析了琼东北地区构造应力场的动态变化过程。再结合区域重力场累积动态变化及基于GPS基线的区域构造活动综合分析,结果表明,琼东北地区近几年以持续的应力减弱活动为主,今后需跟踪其转折变化情况的发生,并加强多学科、多手段的密切跟踪。We selected digital water level and corresponding air pressure data of 5 wells in the northeast Hainan,which are continuous,stable and with obvious solid tide since 2008.These wells are Haikou ZK26 well,Qionghai Jiaji well,Xiangrong village well,Volcanic fluid well,and Wenchang Tanniu well.We obtained porosity and volume compression coefficient between solid skeleton and water under undrained condition by the barometric efficiency and O_(1)、M_(2) tidal factor smooth fitting.In horizontally layered one-dimensional aquifer mode,using partial aquifer parameters(porosity,water and solid skeleton volume compression coefficient)and relationship between water level variation and aquifer vertical stress,we quantitatively analyzed the dynamic change process of tectonic stress field of the northeast Hainan.Combined with the cumulative dynamic change of regional gravity field and the comprehensive analysis of regional tectonic activities based on GPS baseline,the results show that the northeast of Hainan is dominated by continuous stress weakening activities in recent years.In the future,it is necessary to track the occurrence of its turning changes and strengthen the close tracking of multi-disciplinary and multi means.

关 键 词：数字化水位 构造应力场 时序特征 琼东北地区 

分 类 号：P315.3[天文地球—地震学]