滇东北地区地震弱活动前兆异常特征研究

地震 ›› 2019, Vol. 39 ›› Issue (3): 115-126.

滇东北地区地震弱活动前兆异常特征研究

李利波¹, 付虹¹, 李琼¹, 何德强²

1.云南省地震局, 云南昆明 650224;
2.昭通市防震减灾局, 云南昭通 657000

收稿日期:2017-11-06 出版日期:2019-07-31 发布日期:2019-08-09
作者简介:李利波(1984-), 男, 云南曲靖人, 工程师, 主要从事地震地下流体及地震预测研究 ① 云南省地震局. 2014. 云南省2014年年中地震趋势报告.
基金资助:
国家自然科学基金重点项目(U1602233)资助

Precursory Anomalies of Earthquake Weak Activity in Northeastern Yunnan

LI Li-bo¹, FU Hong¹, LI Qiong¹, HE De-qiang²

1.Earthquake Administration of Yunnan Province, Kunming 650224, China;
2.Infosystem for Seismological Bureau of Zhaotong, Zhaotong 657000, China

Received:2017-11-06 Online:2019-07-31 Published:2019-08-09

摘要/Abstract

摘要： 以鲁甸M_S6.5地震震中附近的鲁甸大坪子泉水氡、水质观测资料为基础, 通过对其地震前后的异常特征进行差异性对比, 分析认为震前地震活动丛集, 水氡、水质异常持续时间较长, 幅度较大, 表现为破年变异常现象; 震后为小震群弱活动, 水氡、水质异常幅度相对较小, 持续时间较短, 多次出现同步转折, 表现为介质弱化区的前兆异常特征。从水样测试结果, GNSS位移观测资料、 GPS时间序列曲线及地震活动性等方面分析了鲁甸水氡、水质的异常机理, 认为鲁甸的水质离子组分群体异常, 与区域的变形活动有关, 局部应力的不断积累, 加剧了地下深部物质活动及构造活动; 近期的同步转折现象属于介质弱化区应力调整状态下的前兆异常。

关键词: 前兆异常特征, 地震弱活动, 介质弱化区, 滇东北地区, 鲁甸M_S6.5地震

Abstract: The paper selected the observation data of Radon and Water quality ion in Dapingzi spring, which located near the epicenter of Ludian M_S6.5 earthquake, and compared the anomalous characteristic before and after the earthquake. The results show that moderate-strong seismic activity is clustered before the earthquake. Radon and water quality anomaly lasted for a long time and had a large amplitude. It presents a phenomenon of breaking annual variation. While after the earthquake, weak activity of small earthquake swarmed, the abnormal amplitude is relatively small, and the duration is shorter, and there are many simultaneous twists and turns, which is the precursor anomaly of the medium weakening region. Based on the results of water sample test, GNSS displacement observation data, GPS time series curve and earthquake activity, this paper analyzed the precursor mechanism of the Radon and Water quality ion. We think that the group anomalies are related to the regional deformation activities. Local stress is continuously accumulated in Northeastern Yunnan, so that deep underground material activities and tectonic activities continue to be intensified. The recent synchronic transition phenomenon belongs to the precursor anomaly in the stress adjustment of the medium weakening area.

Key words: Ludian M_S6.5 earthquake, Precursory anomaly, Seismic weak activity, Medium weakening area, Northeastern Yunnan

中图分类号:

P315.7

李利波, 付虹, 李琼, 何德强. 滇东北地区地震弱活动前兆异常特征研究[J]. 地震, 2019, 39(3): 115-126.

LI Li-bo, FU Hong, LI Qiong, HE De-qiang. Precursory Anomalies of Earthquake Weak Activity in Northeastern Yunnan[J]. EARTHQUAKE, 2019, 39(3): 115-126.

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