ANALYSIS UPON DYNAMIC RANGE AND MONITORING CAPABILITY OF WFSD DIGITAL SEISMIC NETWORK OF THE LONGMENSHAN FAULT ZONE
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摘要: 5.12汶川特大地震后，为了监测地震的发展趋势，探讨大范围的构造应力场作用，在龙门山断裂带上及时布设临时数字地震台网。数字台网由11个数字地震台组成，遍布龙门山断裂带的北东缘和南西端。为了分析WFSD数字地震台网监测能力及其动态范围，随机抽取一定数量台站观测数据，通过傅立叶变换和功率谱密度分析，获得台基地动噪声均值，进而分析观测系统的动态范围和台网监测能力。根据计算结果与记录的大量微震对比研究，表明在龙门山断裂带上，WFSD数字地震台网具有监测ML 1.5级微地震的能力，且与中国地震局台网中心发布的地震结果基本吻合。因此，WFSD数字地震台网可为龙门山断裂带变形机制研究提供基础的观测资料。Abstract: After the 5.12 earthquake in Wenchuan, the temporary digital seismic network has been layout in time in Longmenshan fault zone in order to monitor earthquake trends and probe into the large-scale tectonic stress field activity. Digital seismic network is made of 11 digital seismic instruments, and which are arranged at north eastern margin and southwestern side of Longmenshan fault zone. A certain number of data from observation stations are randomly selected in order to analyze the monitoring capability and dynamic range of WFSD digital seismic network. The dynamic noises of station base are acquired through the Fourier Transform and power spectral density analysis. And then, the dynamic range of observing systems and monitoring capacity of network are analyzed. WFSD digital seismic network has a monitoring ML1.5 micro-seismic capacity in Longmenshan fault zone based on Comparing the computing results with the record of a large number of micro-seismic. And it basically accorded with the results of that by Seismological Bureau Networks Center of China. Therefore, WFSD digital seismic network can provide a basic observing datum for the deformation mechanism research of Longmenshan fault zone.
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图 3 龙门山断裂带数字地震台站分布
Figure 3. Distributions of the digital seismic stations in Longmenshan fault zone
图 5 各子台台基地动噪声功率谱密度图
Figure 5. Noise power spectral density maps of the sub-station bases
图 6 龙门山断裂带数字地震台网监测能力示意图
Figure 6. Monitoring capacity of digital seismic network in the Longmenshan fault zone
图 7 汶川台记录的草坡ML1. 5级地震波形(20 km) (2009年3月25日8: 48)
UD—上下向分量; EW—东西向分量; NS—南北向分量
Figure 7. The recorded earthquake waveform (ML1. 5) of Caopo station at Wenchuan
图 8 2009年5月14日四川平武县ML 4. 2级地震波形
UD—上下向分量; EW—东西向分量; NS—南北向分量
Figure 8. The ML 4. 2 seismic waveform on May 14, 2009 at Pingwu County, Sichuan Province
表 1 龙门山断裂带数字地震台网位置及相应参数
Table 1. Location and corresponding parameters of the digital seismic network in Longmenshan fault zone
表 2 龙门山断裂带数字地震台网子台背景噪声
Table 2. Sub-station background noise of the digital seismic network in Longmenshan fault zone
表 3 龙门山断裂带数字地震台网各子台站观测动态范围
Table 3. The sub-station observation dynamic ranges of the digital seismic network in Longmenshan fault zone
表 4 台站水平向最大噪声位移和不同震级对应的震中距
Table 4. The maximum noise displacement of stations level direction and corresponding epicentral distance of different magnitude
表 5 2009年5月~ 2009年8月龙门山数字台网与国家地震局台网中心定位结果对比
Table 5. Compared positioning results (ML≥ 4. 0) of the Longmenshan digital seismic network to the State Seismological Bureau network center on May to August, 2009
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