| 2013年洱源MS5.5和MS5.0地震 发震构造识别 |
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| 引用本文： | 赵小艳,付虹.2013年洱源MS5.5和MS5.0地震 发震构造识别[J].地震学报,2014,36(4):640-650. |
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| 作者姓名： | 赵小艳 付虹 |
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| 作者单位： | 中国昆明 650224 云南省地震局 |
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| 基金项目： | 国家“十二五”科技支撑计划项目(2012BAK19B01-07)资助. |
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| 摘 要： | 采用Hypo2000和双差定位方法对2013年云南洱源MS5.5和MS5.0地震序列进行了重新定位. 结果显示: 精定位后洱源地震序列分布优势方向集中在160°； 用CAP方法反演了两次5级地震震源机制， 节面Ⅱ的走向158°和157°与余震优势分布方向一致； 现场考察MS5.5和MS5.0地震极震区的长轴方向也是NW向. 上述结果与维西—乔后断裂NNW走向一致， 据此判定该断裂为洱源MS5.5和MS5.0地震的发震构造. 序列震源机制解显示， 洱源地震序列表现出不同的错断性质以及不同方向主压应力， 可能与维西—乔后断裂所处区域复杂构造应力场有关.
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| 关 键 词： | 洱源地震序列 精确定位 震源机制 维西—乔后断裂 |
| 收稿时间： | 2013-05-07 |
Seismogenic structure identification of the 2013 Eryuan MS5.5 and MS5.0 earthquake sequence |
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| Affiliation: | Earthquake Administration of Yunnan Province, Kunming 650224, China |
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| Abstract: | The Eryuan MS5.5 and MS5.0 earthquake sequence are relocated by using absolute location (Hypo2000) and double-difference earthquake location (HypoDD) methods. The results show that the dominant direction of relocated aftershocks concentrated at 160°. Focal mechanisms of the MS5.5 and MS5.0 earthquakes are inverted by CAP method. The inversion result shows that the strike angles of the nodal plane Ⅱ were 158° and 157°, respectively, which are consistent with dominant distribution direction of aftershocks. Field survey suggests that the major axis of the meizoseismal region was also in NW direction. The above three directions were consistent with the NNW strike orientation of Weixi--Qiaohou fault, which can be considered as the seismogenic structure of the Eryuan earthquake sequence. Focal mechanisms of the sequence indicate that different focal dislocations and different orientations of principal compression stresses, may have relationship with the complex regional structural stress field of Weixi--Qiaohou fault. |
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