Study on Lg wave attenuation imaging in Yunnan
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摘要: 收集了云南省及周边121个固定台站于2014年5月—2019年5月记录到的470次M≥4.0宽频带地震记录，利用反双台法处理了6 976条垂直向波形数据，通过LSQR方法反演得到了云南地区的空间分辨率小于100 km的1 Hz下Lg波衰减成像。反演结果表明，云南地区地壳Lg波的Q0值介于60—300，整体为低Q0背景，横向不均匀性变化显著。云南地区低Q0值的分布特点，反映了Lg波在云南地区衰减强烈。红河断裂西侧Q0值较低，在50—160之间，东侧Q0值较高，在120—200之间，分布特征与沉积层厚度分布一致，松散的沉积层可能是造成东侧地区Lg波高衰减的主要原因。云南地区地壳Lg波Q0值呈现出了与地表热流值分布相似的差异化分布特征，这可能与频繁的地震、长期强烈的构造运动以及深部物质随火山活动上涌有关。Abstract: In this paper, 470 broadband seismic records of natural earthquakes with M≥4.0 between May 2014 and May 2019 recorded by 121 fixed stations in and around Yunnan Province are collected. 6 976 high-quality vertical wave data is processed by using the reverse two-station method. The attenuation imaging of Lg wave at 1 Hz with spatial resolution less than 100 km in Yunnan area is inverted. The inversion results show that the Q0 value of Lg wave in Yunnan is in 60 to 300 range, and the whole is in low Q0 background, with significant changes in lateral heterogeneity. The distribution characteristics of low Q0 value in Yunnan area reflect the strong attenuation of Lg wave in Yunnan area. The Q0 value in the west side of Honghe fault is relatively low, in 50 to 160 range, and in the east side is relatively high, in 120 to 200 range. The distribution characteristics are consistent with the distribution of sedimentary layer thickness. Loose sedimentary layer may be the main cause of high attenuation in the east side. The Q0 value of Lg wave in Yunnan area shows a similar differential distribution with the distribution of surface heat flow, which may be related to frequent earthquakes, long-term strong tectonic movement and deep material upwelling with volcanic activity.
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Keywords:
- Yunnan area /
- Lg wave imaging /
- seismic wave attenuation /
- Q value /
- reverse two-station method
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图 10 2°，1°以及0.5°的检测板模型（a）及测试结果（b）
Figure 10. 2°，1° and 0.5° checkboard models （a） and test results （b）
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图 1 云南地区构造示意图及M≥6.0地震分布图
F1：金沙江断裂；F2：怒江断裂；F3：南汀河断裂；F4：澜沧江断裂；F5：无量山断裂；F6：丽江断裂；F7：程海断裂；F8：红河断裂；F9：安宁河断裂；F10：绿汁江断裂；F11：则木河断裂；F12：小江断裂
Figure 1. Regional tectonic settings and distribution of M≥6.0 earthquakes in Yunnan area
F1：Jinshajiang fault；F2：Nujiang fault；F3：Nantinghe fault； F4： Lancangjiang fault；F5：Wuliangshan fault；F6：Lijiang fault； F7：Chenghai fault；F8：Honghe fault；F9：Anninghe fault； F10： Lüzhijiang fault；F11：Zemuhe fault；F12：Xiaojiang fault
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图 5 2018年1月7日缅甸ML5.6地震波形及Lg波速度窗口示意图
Figure 5. ML5.6 earthquake waveform and Lg wave velocity window on January 7，2018 in Burma
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图 6 反双台法示意图
红色星形a和b代表两个地震事件，黑色三角形i和j代表两个台站。d代表距离，θ表示两个台站到一个事件的夹角（a） 理想情况下反双台法的几何路径；（b） 实际情况中的反双台法的几何路径
Figure 6. Schematic diagram of reverse two-station method
The red stars （a and b） represent earthquakes and the black triangles （i and j） are seismic stations. d represents the distance. θ represents the angle between two stations and an event （a） Ideal recording geometries for the application of reverse two-station method；（b） Practical geometries in reverse two-station method
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图 7 Lg波反双台法射线数量
Figure 7. The number of rays of Lg wave using reverse two-station method
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图 9 云南反双台法射线的Lg波Q0值分布
Figure 9. Q0 value distribution using reverse two-station method in Yunnan area
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