[1]杨 芬,李 庆,杨建文,等.2023年云南芒市MS5.0地震前地下流体异常特征[J].华南地震,2024,(04):66-76.[doi:10.13512/j.hndz.2024.04.08]
 YANG Fen,LI Qing,YANG Jianwen,et al.Characteristics of Underground Fluid Anomalies Before MS5.0 Earthquake in Mangshi,Yunnan Province in 2023[J].,2024,(04):66-76.[doi:10.13512/j.hndz.2024.04.08]
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2023年云南芒市MS5.0地震前地下流体异常特征()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2024年04期
页码:
66-76
栏目:
地震科学研究
出版日期:
2024-12-30

文章信息/Info

Title:
Characteristics of Underground Fluid Anomalies Before MS5.0 Earthquake in Mangshi,Yunnan Province in 2023
文章编号:
1001-8662(2024)04-0066-11
作者:
杨 芬李 庆杨建文高 琼张华英杨树锋
中国地震科学实验场大理中心,云南 大理 671000
Author(s):
YANG FenLI QingYANG JianwenGAO QiongZHANG HuanyingYANG Shufeng
Dali Center of China Earthquake Science Experimental Site , Dali 671000, China
关键词:
芒市MS5.0地震地下流体源兆近兆场兆同步性异常中短临异常
Keywords:
MS5.0 earthquake in Mangshi Underground fluid Focal precursor Near precursor Field precursorSynchronous anomalyMiddle-short impending anomaly
分类号:
P315.723
DOI:
10.13512/j.hndz.2024.04.08
文献标志码:
A
摘要:
总结了2023年12月2日云南芒市MS5.0地震前,云南地下流体异常在空间、时间、形态和同步性四个方面的特征:云南地下流体共存在18项异常,空间上主要集中分布在距震中350km范围内的活动构造上及邻近区域,以源兆和近兆为主,异常空间动态发展过程为源兆最先出现,其后源兆、近兆和场兆并存,震前1个月,异常测项向源区收缩;异常时间主要集中在7月10日至8月9日,期间达到异常指标的测项有13项;时间上源兆和近兆都存在同步性异常现象,同步性异常在2023年11月9日同样呈现出向源区收缩,异常时间进程表现为中、短、临3个阶段,源兆4项短期异常和3项临震异常,近兆5项中期异常和5项短期异常,场兆1项中期异常;异常形态有持续性异常和突跳性异常两种,异常过程表现为稳态→非稳态→稳态发展的特征,反映地震孕育过程由稳态进入非稳态,随后发震的动态过程。
Abstract:
In this paper,the characteristics of underground fluid anomalies in Yunnan Province before the MS5.0 earthquake in Mangshi on December 2nd, 2023 were summarized in terms of space, time, shape, and synchronism. There were 18 anomalies in underground fluids in Yunnan. Spatially, it was mainly distributed on active structures and adjacent areas within 350 km from the epicenter,with focal precursors and near precursors as the main ones. The dynamic development process of anomaly space was that the focal precursor appeared first,and then the focal precursor, near precursor, and field precursor coexisted. One month before the earthquake, the anomaly measurement term shrank to the focal region. The anomaly time lasted mainly from July 10th to August 9th, during which 13 items reached the anomaly index. Temporally,there were synchronous anomalies in both focal and near precursors, and the synchronous anomalies shrank to the focal region on November 9th, 2023. The time course of anomalies was divided into three stages: middle-term, short-term, and impending, with four short-term anomalies and three impending earthquake anomalies in focal precursors, five middle-term anomalies and five short-term anomalies in near precursors, and one middle-term anomaly in field precursors. There were two kinds of anomaly forms: persistent anomaly and sudden anomaly. The anomaly process was characterized by steady-unsteady-steady development, which reflected the dynamic process of earthquake preparation from a steady state to an unsteady state,and then earthquakes occurred.

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备注/Memo

备注/Memo:
收稿日期:2024-03-18
作者简介:杨芬(1971-),女,高级工程师,主要从事地震预测研究。E-mail:yangfen710806@sina.com
更新日期/Last Update: 2024-12-30