地震研究

利用高分1号遥感影像和Googleearth影像数据,对2016年1月21日青海门源MS6.4地震的发震构造(冷龙岭断裂系)相关的微地貌(水系、冲洪积扇、山脊等)开展遥感解译研究工作。研究结果表明:冷龙岭断裂具有典型的左旋走滑特征,晚更新世以来断裂发生过4期断层活动,从老至新位错量分别为45～65 m,22～52 m,13～27 m及7～10 m,说明该断裂具有较强的水平活动特性,但从位错量可以看出断层活动幅度逐渐减弱; 结合本次地震的余震分布和震源机制解,初步判定冷龙岭断裂是本次地震的控震构造,但发震构造可能为冷龙岭北侧的次级逆冲断层。

Using high score No.1 remote sensing image and Googleearth image data,we carried out the interpretation of remote sensing work of the micro-topography(river,alluvial fan,ridges etc. )of Lenglongling Fault which is the seismogenic tectonics of Menyuan MS6.4 earthquake on Jan.21,2016. The study results have shown that the Lenglongling Fault has characteristics of typical left-lateral and strike-slip. The fault occurred 4 periods of fault activity since the late Pleistocene,and their displacement are 4 565 m,2 252 m,1 327 m and 710 m from the old to the new,which reflects the activity of fault is strong,but the amplitude of fault activity gradually decreases. Combined with aftershocks distribution and focal mechanism solutions,we judge that the Lenglongling Fault is the control structure of this earthquake,however,the seismogenic tectonics may be the secondary thrust north fault of Lenglongling Fault.

引言
1 区域地质概况
2 余震及震源机制解特征
3 断裂微地貌遥感解译特征
4 结论与讨论

图1 2016年门源MS6.4地震发震构造图(a)区域构造位置图;(b)门源MS6.4地震震中及余震分布; (c)门源MS6.4地震影响烈度图<br/>Fig.1 Structural map of Menyuan MS6.4 earthquakes in 2016 (a)location map of regional tectonic;(b)distribution of epicenter and aftershocks of Menyuan MS6.4 earthquake; (c)seismic intensity chart of Menyuan MS6.4 earthquake

图1 2016年门源MS6.4地震发震构造图(a)区域构造位置图;(b)门源MS6.4地震震中及余震分布; (c)门源MS6.4地震影响烈度图
Fig.1 Structural map of Menyuan MS6.4 earthquakes in 2016 (a)location map of regional tectonic;(b)distribution of epicenter and aftershocks of Menyuan MS6.4 earthquake; (c)seismic intensity chart of Menyuan MS6.4 earthquake

表1 2016门源MS6.4地震震源机制解<br/>Tab.1 Focal mechanism solutions of Menyuan MS6.4 earthquake in 2016

表1 2016门源MS6.4地震震源机制解
Tab.1 Focal mechanism solutions of Menyuan MS6.4 earthquake in 2016

图2 春圈窝东北断裂断错地貌解译<br/>Fig.2 Fault offset landforms interpretation in northeast of Chunjuanwo Village

图2 春圈窝东北断裂断错地貌解译
Fig.2 Fault offset landforms interpretation in northeast of Chunjuanwo Village

图3 青石嘴镇东北断裂断错地貌解译<br/>Fig.3 Fault offset landforms interpretation in northeast of Qingshizui Town

图3 青石嘴镇东北断裂断错地貌解译
Fig.3 Fault offset landforms interpretation in northeast of Qingshizui Town

图4 抓龙口村西北断裂断错地貌解译<br/>Fig.4 Fault offset landforms interpretation in northwest of Zhualongkou Village

图4 抓龙口村西北断裂断错地貌解译
Fig.4 Fault offset landforms interpretation in northwest of Zhualongkou Village

图5 冷龙岭断裂解译点冲沟位错量(据林爱明等(2003)修改)(a)冷龙岭断裂左旋断错水系示意图;(b)解译点处水系解译及位移分布图;(c)各单期次位移分布图<br/>Fig.5 Dislocation of gully of interpretation point of Lenglongling Fault(modified based on Lin et al(2003))(a)the diagram of drainage levorotatory offsets of Lenglongling Fault;(b)distribution of the drainage interpretation and displacement;(c)distribution of the single phase displacement

图5 冷龙岭断裂解译点冲沟位错量(据林爱明等(2003)修改)(a)冷龙岭断裂左旋断错水系示意图;(b)解译点处水系解译及位移分布图;(c)各单期次位移分布图
Fig.5 Dislocation of gully of interpretation point of Lenglongling Fault(modified based on Lin et al(2003))(a)the diagram of drainage levorotatory offsets of Lenglongling Fault;(b)distribution of the drainage interpretation and displacement;(c)distribution of the single phase displacement

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备注

引言

1 区域地质概况

2 余震及震源机制解特征

3 断裂微地貌遥感解译特征

4 结论与讨论

期刊信息