摘要
基于EIGEN-6C4重力异常和ETOPO1地形数据,采用基于fan小波的相关性分析方法计算安徽及周边地区较高分辨率的各向同性岩石圈有效弹性厚度T_e(effective elastic thickness),结合区域地质构造和地球动力学背景进行讨论。结果表明,研究区T_e处于5~75km之间,大别造山带和下扬子地区为T_e低值区,郯庐断裂两侧T_e值相对较低,河淮盆地和苏北盆地T_e值较高,T_e分布反映了区域特定地质构造特征和地球动力学背景;地震活动主要分布在10~50kmT_e值范围内,集中在T_e低值区和T_e值陡变带,表明相关区域岩石圈抵抗形变能力较弱,易于发生地震。
The Te map of Anhui and surrounding regions is calculated from EIGEN-6C4 gravity anomalies and ETOPO1 data using the isotropic fan wavelet method. The tectonic structure and geodynamie features of this area are discussed according to the Te map. The results indicate that the To of Anhui and its surrounding re- gions varies from 5 to 75 kin. The Te values of the Dabie orogenic belt and lower Yangtze region are low, as are the Te values along Tan-Lu fault. High Te values appear at Hehuai basin and Subei basin. The Te distribution mainly reflects the particular characteristics of tectonic structure and geodynamic features of corresponding areas. Most of the seismic activities located in regions with Te values vary from 10 to 50 km; the spatial distribution of earthquakes indicates that earthquakes tend to occur in regions with low Te or steep Te gradients, further indicating that lithospheres of regions with low Te or steep Te gradients show higher seismicity rateand are not strong enough to resist deformation.
出处
《大地测量与地球动力学》
CSCD
北大核心
2017年第6期633-637,643,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局地震研究所所长基金(IS201416141)
安徽省地震科研基金青年项目(20150404)~~
关键词
岩石圈
有效弹性厚度
安徽
地震活动
lithosphere
effective elastic thickness
Anhui
seismicity
