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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

47

期数:

2024年03期

页码:

430-440

栏目:

综述

出版日期:

2024-05-01

文章信息/Info

Title:

Characteristics of the Recent Seismicity in the Tangshan Old Seismic Region

作者:

周 依¹; 2; 曹 筠²; 马旭东²; 单连君²

(1.河北红山巨厚沉积与地震灾害国家野外科学观测研究站,河北 邢台 054000; 2.河北省地震局,河北 石家庄 050021)

Author(s):

ZHOU Yi¹; 2; CAO Jun²; MA Xudong²; SHAN Lianjun²

(1.Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards,Xingtai 054000,Hebei,China;2.Hebei Earthquake Agency,Shijiazhuang 050021,Hebei,China)

关键词:

唐山地震;  地震活动特征;  背景地震;  迁移规律

Keywords:

the 1976 Tangshan M_S7.8 earthquake;  characteristics of seismicity;  background seismicity;  seismic migration law

分类号:

P315.72

DOI:

10.20015/j.cnki.ISSN1000-0666.2024.0046

摘要:

为分析唐山老震区地震活动背景,对该区域现今地震活动特征进行研究。老震区现今地震活动与1976年唐山M_S7.8地震早期余震密集区域存在一定差异,结合区域背景地震活动统计结果,认为该区域地震活动受唐山地震序列影响逐渐减弱,逐步趋近于背景地震。地震分布呈现出明显的3分区差异,主要集中于中区,东区次之,西区最弱。中等地震的空间分布特征显示,地震活动存在东、中、西区交替发震的规律。目前,唐山老震区构造应力积累加速,存在地震活动水平由平静向活跃转变的可能,需要重点关注唐山断裂带北段以及滦县—乐亭断裂和卢龙断裂的交汇区域。

Abstract:

To analyze the seismic background in the Tangshan old seismic region and provide earthquake trend predictions,we describe the characteristics of the recent seismicity in this region.Results show that the recent seismicity in the Tangshan old seismic region is different from the early aftershock intensive area of the 1976 Tangshan M_S7.8 earthquake.Considering the statistical results of regional background seismicity,the influence of the Tangshan earthquake is gradual weakening,and the recent seismicity in the Tangshan old seismic region can be considered as background seismicity.The characteristics of seismicity are different in the three sub-areas of the Tangshan old seismic region,the earthquakes mainly concentrate in the central area,followed by the eastern area,and the western area was the weakest,and the moderate earthquake following a law of alternate occurrence in the east,central and west sub-areas.This seismic migration law constitutes a reference for the determination of the locations of future moderate-to-strong earthquakes.At present,the accumulation of tectonic stress is accelerating in the old seismic region of Tangshan.Seismicity changing from quiet to active is possible,and moderate-to-strong earthquakes may occur at the northern segment of the Tangshan Fault and the intersection of the Luanxian-Laoting Fault and the Lulong Fault in the future.

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备注/Memo

备注/Memo:

收稿日期:2022-10-27.
基金项目:河北省重点研发项目(20375404D); 河北省地震科技星火计划项目(DZ2021121700014、DZ2024112100001); 河北省地震局创新团队项目(DZ202109080114).
第一作者简介:周 依(1991-),工程师,主要从事数字地震学和地震活动性研究.E-mail:zhouyimonday@163.com.

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更新日期/Last Update: 2024-05-01