The comparative research of South China model and AH2015 model in Anhui regional seismic location
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摘要: 本文选取了2010—2018年发生于安徽区域的MS2.0以上地震102次,使用单纯形定位法、Hyposat和Locsat定位程序分别配置华南模型与AH2015模型对其进行重定位。统计定位残差和定位深度,对比分析两种模型在安徽区域地震定位中的应用效果,同时对流动台反演深度进行精细分析。结果表明,使用AH2015模型在安徽区域的地震定位中残差更小,定位深度更符合真实深度,比华南模型更适用于安徽区域的地震定位研究。Abstract: In this article, We selected 102 earthquakes above MS2.0 that occurred in Anhui region from 2010 to 2018, and re-located them using the simple locating method, Hyposat, and Locsat localization program with the South China model and AH2015 model respectively. The positioning residuals and depths of earthquakes are obtained and the application effects on earthquake location of the two models in Anhui region are analyzed and discussed. The inversion depths of mobile stations were used for fine analysis. The results show that the AH2015 model is more suitable than the South China model for seismic localization in Anhui area because the residuals are smaller and the localization depth is more consistent with the real depth.
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Key words:
- earthquake location /
- South China model /
- AH2015 model
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表 1 华南模型和AH2015模型参数表
Table 1. South China and AH2015 model parameters
层号 华南模型 AH2015模型 层厚/km P波速度/km·s−1 S波速度/km·s−1 层厚/km P波速度/km·s−1 S波速度/km·s−1 1 21 6.01 3.55 19 6.14 3.57 2 12 6.88 3.93 15 6.60 3.84 3 7.98 4.58 8.00 4.65 表 2 不同定位方法对应不同模型残差分布
Table 2. Different positioning methods correspond to different model residual distributions
单纯形定位法 Hyposat定位法 Locsat定位法 华南模型 AH2015模型 华南模型 AH2015模型 华南模型 AH2015模型 最小值/s 0.243 0.212 0.312 0.243 0.320 0.261 最大值/s 0.556 0.555 0.630 0.611 0.902 0.900 均值/s 0.399 0.363 0.477 0.432 0.582 0.531 表 3 霍山地区流动台反演地震深度对照表
Table 3. Mobile seismic station inversion seismic depth in Huoshan area
日期 时间 纬度/°N 经度/°E 台网定位
深度/km流动台反演
深度/km震级(ML) 震中位置 2020-02-16 37:26.2 31.371 116.119 9 6.25 3.1 安徽霍山 2020-02-28 35:43.8 31.361 116.119 7 7.31 2.2 安徽霍山 2020-03-22 23:30.9 31.369 116.119 6 6.48 2.8 安徽霍山 2020-03-28 22:25.8 31.361 116.113 5 7.20 2.7 安徽霍山 2020-07-21 54:52.7 31.186 115.967 11 7.04 2.5 安徽霍山 2020-08-28 23:23.8 31.397 116.171 7 5.94 2.7 安徽霍山 2020-08-28 23:38.2 31.395 116.173 7 6.78 2.5 安徽霍山 2020-08-31 08:07.0 31.400 116.181 4 5.63 2.5 安徽霍山 2020-11-24 44:04.2 31.354 116.113 8 7.33 2.0 安徽霍山 2020-11-24 10:35.4 31.361 116.111 8 6.49 2.2 安徽霍山 -
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