| 漾濞MS6.4地震前震源机制一致性参数演化特征 |
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| 引用本文： | 樊文杰.漾濞MS6.4地震前震源机制一致性参数演化特征[J].大地测量与地球动力学,2023,43(1):82-88. |
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| 作者姓名： | 樊文杰 |
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| 作者单位： | 云南省地震局 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项(ZDJ2019-21)~~； |
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| 摘 要： | 基于漾濞地震序列及周边历史地震的震源机制解数据，初步分析震源机制类型和应力轴分布特征，在此基础上研究震源机制一致性参数与漾濞地震及周边中强地震活动的关系。结果表明，漾濞地震序列及震源区域附近历史地震的震源机制类型主要为走滑型地震，其次为正断型。不同半径范围内的震源机制一致性参数平均Misfit角和漾濞MS6.4地震等中强地震活动具有一定的对应关系，漾濞地震及周边中强地震发生前，震源一致性参数均出现下降现象，即震源机制趋于一致；同时，根据计算的b值变化情况来看，研究区中强地震多发生于b值下降时段或低b值期。当研究区的震源机制一致性参数Misfit角低于40°且开始下降时，可能表明区域构造应力开始集中增强，发震时间逐渐临近，强震危险性不断增加。
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| 关 键 词： | 漾濞地震 中强地震 震源机制 一致性参数 演化特征 |
Evolutionary Characteristics of the Focal Mechanism Consistency Parameter before the Yangbi MS6.4 Earthquake |
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| FAN Wenjie.Evolutionary Characteristics of the Focal Mechanism Consistency Parameter before the Yangbi MS6.4 Earthquake[J].Journal of Geodesy and Geodynamics,2023,43(1):82-88. |
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| Authors: | FAN Wenjie |
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| Abstract: | Based on focal mechanism solutions of the Yangbi earthquake sequence and historical earthquakes, we preliminarily analyze types of the focal mechanism solutions and distribution characteristics of stress axis. Further, we analyze the relationship between the focal consistency parameter and the Yangbi earthquake and historical moderate and strong earthquakes. The results show that the types of focal mechanism solutions of the Yangbi earthquake sequence and historical earthquakes are mainly strike-slip earthquakes, followed by normal earthquakes. The average Misfit angle in different radii have a certain corresponding relationship with the moderate-strong earthquakes such as Yangbi MS6.4. The focal mechanism consistency parameter all decreased before these earthquakes; that is, the focal mechanism solutions tended to be consistent. At the same time, according to the calculated b-value changes, moderate and strong earthquakes in the study area also mostly occurred in the period of b-value decline or low b-value period. When the source consistency parameter Misfit angle in the study area is lower than 40° and begins to decrease, it may indicate that the regional tectonic stress starts to concentrate. The earthquake is gradually approaching, and the risk of strong earthquakes is increasing. |
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| Keywords: | Yangbi earthquake moderate-strong earthquake focal mechanism consistency parameter evolution characteristics |
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