地质力学学报2025，Vol.31Issue(2)：313-324,12.DOI:10.12090/j.issn.1006-6616.2024036
南堡凹陷地壳构造稳定性:源自地震活动时空特征的证据
Tectonic stability of the Nanpu sag:Evidence from temporal and spatial characteristics of seismic activity
摘要
Abstract
[Objective]The evaluation of regional tectonic stability plays a crucial role in the planning and construction of major projects.Given that the Nanpu sag is the site for China's first offshore gas storage facility,its tectonic stability is naturally a focal point of concern.[Methods]Based on historical seismic data for the region,this study summarizes the spatiotemporal distribution of seismic activities in the Nanpu sag and its surrounding areas.It analyzes the rupture modes of the Tangshan-Hejian-Cixian fault zone and the Zhangjiakou-Penglai fault zone,and explores the tectonic stability of the Nanpu sag.[Results]The results indicate that the Nanpu sag is a relatively stable"safe island"near active tectonic zones.Regionally,stress accumulated around the periphery of the Nanpu sag is mainly released through the activity of faults such as the Luanxian-Laoting and Baodi-Ninghe faults,and the influence of the seismic activity at the periphery on the interior of the Nanpu sag is limited.Internally,a large-scale creep-dominated extensional deformation system has developed within the Nanpu sag.[Conclusion]Given the current tectonic stress background,only a small magnitude of stress accumulation is required to trigger unstable sliding of pre-existing normal faults within the Nanpu sag.This suggests that stress cannot accumulate over long time scales,and thus the interior of the Nanpu sag lacks conditions for the occurrence of major earthquakes.关键词
断裂带破裂模式/地震活动/地壳构造稳定性/南堡凹陷/构造应力Key words
rupture model of fault zone/seismic activities/tectonic stability/Nanpu sag/tectonic stress分类
地质学引用本文复制引用
张扬,商琳,王淼,吴海涛,段彬..南堡凹陷地壳构造稳定性:源自地震活动时空特征的证据[J].地质力学学报,2025,31(2):313-324,12.基金项目
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1000701)This research is financially supported by the National Science and Technology Project on Deep Earth Probe and Mineral Resources Exploration(Grant No.2024ZD1000701). （2024ZD1000701）
