地质力学学报2025，Vol.31Issue(6)：1177-1187,11.DOI:10.12090/j.issn.1006-6616.2025107
郯庐断裂带中南段构造应力场与地壳强度
Tectonic stress field and crustal strength of the central-southern Tanlu Fault Zone
摘要
Abstract
[Significance]The accurate estimation of crustal strength—the capacity of the lithosphere to resist tectonic deformation—is fundamental to both seismic hazard assessment and geodynamic studies.[Methods]This study integrates borehole logging data and focal mechanism solutions from the central-southern Tanlu Fault Zone.[Objective]The study aims to analyze the characteristics of the tectonic stress field.[Results]The study reveals that the stress states in the shallow and deep crust are generally consistent,with a predominant strike-slip stress regime and a preferential ENE-WSW orientation of the maximum horizontal principal stress.The regional fault friction coefficient is approximately 0.3,significantly lower than the 0.6-1.0 range suggested by Byerlee's law,indicating a moderate level of fault frictional strength.Furthermore,constrained by these findings,a crustal strength profile was established for the central-southern Tanlu Fault Zone.[Conclusion]This profile reveals a relatively strong upper and middle crust underlain by an extremely weak lower crust.Regional tectonic forces are primarily transmitted through the upper and middle crust.This extremely weak lower crust is closely linked to the destruction of the North China Craton since the Mesozoic,likely serving as both a consequence and a facilitating mechanism of the deep deformation processes that led to lithospheric thinning.关键词
构造应力/地壳强度/郯庐断裂带/深部变形Key words
tectonic stress field/crustal strength/Tanlu Fault zone/deep deformation分类
天文与地球科学引用本文复制引用
MENG Wen,CHEN Qunce,GUO Xiangyun,HUANG Xin..郯庐断裂带中南段构造应力场与地壳强度[J].地质力学学报,2025,31(6):1177-1187,11.基金项目
深地国家科技重大专项(2024ZD1000706) This research is financially supported by the Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(Grant No.2024ZD1000706). （2024ZD1000706）
