Comparative analysis of focal depth of MS5.0 earthquake in Dafeng sea area of Jiangsu Province on November 17, 2021
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摘要: 选取江苏测震台网震中距2°以内18个地震台站记录清晰的波形资料，使用单纯形、LocSAT、HypoSAT地震定位方法，分别采用华南速度模型、郯庐断裂带中南段速度模型以及IASP91全球速度模型，重新测定江苏大丰海域MS5.0地震震源深度，对获取的深度值进行对比分析。结果表明：3种地震定位方法测定的震源深度结果接近，约为11 ± 2 km；HypoSAT定位方法计算结果较为稳定，IASP91、郯庐断裂带中南段模型均适用于该区域震源深度计算。Abstract: In this paper, we selected the clear waveform data recorded by 18 seismic stations within 2° from the epicenter of Jiangsu seismic network, and remeasured the focal depth of the MS5.0 earthquake in Dafeng sea area of Jiangsu Province by using the simple type, LocSAT and HypoSAT seismic positioning method, using the South China, the middle-south segment of Tan-Lu Fault Zone and IASP91 velocity model respectively. And the obtained depth values are compared and analyzed. The results show that the focal depths measured by the three seismic location methods are close, about 11 ± 2 km; The calculation result of HypoSAT positioning method is relatively stable, and the models of IASP91 and the middle-south segment of Tan-Lu fault zone are suitable for the calculation of focal depth in this area.
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Key words:
- earthquake in Dafeng sea area /
- focal depth /
- seismic location /
- velocity model
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图 1 研究区地质构造、地震射线路径及地震台站分布
Figure 1. Geological structure, seismic ray paths and distribution of seismic stations in the study area
图 2 华南、郯庐断裂带中南段和IASP91速度模型对比
Figure 2. Comparison of velocity models between South China, the middle-south segment of Tan-Lu Fault Zone and IASP91
图 3 不同方法和速度模型测定的震源深度对比
Figure 3. Comparison of focal depth measured by different methods and velocity models
图 4 各个台站资料所用震相走时残差的分布情况
Figure 4. Distribution of seismic phase travel time residuals used in the data of each station
表 1 定位结果参数
Table 1. Positioning result parameters
编号 定位方法 速度模型 震源深度/km 深度误差/km 发震时间 北纬/° 东经/° 定位残差/s 1 单纯形 华南 12.7 － 13:54:29.7 33.51 121.27 0.727 2 单纯形 郯庐断裂带中南段 11.7 － 13:54:27.8 33.52 121.19 0.851 3 单纯形 IASP91 9.9 － 13:54:28.8 33.50 121.10 0.919 4 LocSAT 华南 13.2 ±2.4 13:54:29.5 33.53 121.15 0.981 5 LocSAT 郯庐断裂带中南段 13.7 ±2.1 13:54:28.9 33.50 121.22 0.927 6 LocSAT IASP91 11.8 ±2.3 13:54:28.6 33.51 121.10 1.244 7 HypoSAT 华南 7.6 ±1.5 13:54:28.8 33.56 121.16 0.473 8 HypoSAT 郯庐断裂带中南段 10.4 ±2.0 13:54:27.2 33.53 121.23 0.507 9 HypoSAT IASP91 11.4 ±1.4 13:54:30.1 33.53 121.07 0.493 
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