Ground motion simulation of 2013 Vrümqi MS5.6 and MS5.1 earthquakes
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摘要: 利用基于动力学拐角频率的随机有限断层法，针对2013年3月29日和8月30日乌鲁木齐发生的MS5.6和MS5.1两次地震，选择不同机构的震源参数对23个台站的45条强震记录进行强地震动模拟，对比分析加速度时程和反应谱，并计算模型偏差.通过与实际场点记录进行对比的结果显示:选取的不同机构震源参数模型得到的模拟加速度时程在持时和形状上与实际记录有一定差距，对于近震源的台站，模拟结果的峰值加速度(PGA)比观测结果小，对于稍远的台站，结果基本能够保持一致；而加速度反应谱，模拟结果与观测结果具有较好一致性; 随机有限断层模型的误差在±0.5以内，拟合效果较好，而且高频段的拟合效果要好于低频段；采用不同机构震源参数模型得到的模拟结果与观测结果得到的PGA分布特征较为一致，但模拟结果的峰值加速度要低于观测结果.
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关键词:
- 随机有限断层法 /
- 强地震动模拟 /
- PGA分布 /
- 2013年乌鲁木齐两次地震
Abstract: In this study, we simulated strong ground motion of two earthquakes with MS5.6 and MS5.1 occurred in Xinjiang Vrümqi in 2013 based on modified stochastic finite fault modeling with dynamic corner frequency. 45 strong ground motion records from 23 stations were chosen to simulate by different source parameters, and response spectrum and accelerograms were compared with the observed ones. The results show that simulated strong ground motion have some differences with observed data in duration and shape, and the value of simulated peak ground acceleration (PGA) is less than observed in near-source. For acceleration response spectrum, the simulated result is consistent with observed. The bias of stochastic finite fault is between ±0.5 suggesting a good agreement for high frequency. For different source parameters model, the distribution characteristic of simulated PGAs are consistent with observed, but the simulated PGAs are less than observed ones. -
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图 2 NS和EW两分向高频衰减κ值随距离R分布图
Figure 2. The distribution of Kappa factor κ with distance R for two horizontal components in NS and EW dirrctions
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图 3 MS5.6地震模拟台站分布图
Figure 3. Location of strong motion station used in MS5.6 earthquake simulation
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图 4 乌鲁木齐MS5.6地震模拟加速度时程与观测加速度时程比较图
(a) YFX台站；(b) HYC台站；(c) WJG台站；(d) WHL台站
Figure 4. Comparison between simulated and observed accelerograms for the Vrümqi MS5.6 earthquake
(a) YFX station; (b) HYC station; (c) WJG station; (d) WHL station
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图 5 乌鲁木齐MS5.6地震模拟加速度反应谱PSA(实线)与观测加速度反应谱(虚线)比较
Figure 5. Comparison between simulated (solid line) and observed PSAs (gray line) for the Vrümqi MS5.6 earthquake
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图 6 MS5.1地震模拟台站分布图
Figure 6. Location of strong motion station used in MS5.1 earthquake simulation
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图 7 乌鲁木齐MS5.1地震模拟加速度时程与观测加速度时程对比图
(a) HYC台站；(b) BDW台站；(c) EJZ台站；(d) JMT台站
Figure 7. Comparison between simulated and observed accelerograms of the MS5.1 earthquake
(a) HYC station; (b) BDW station; (c) EJZ station; (d) JMT station
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图 8 乌鲁木齐MS5.1地震模拟加速度反应谱与观测加速度反应谱比较
Figure 8. Comparison between simulated and observed PSA of the MS5.1 earthquake
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图 9 乌鲁木齐MS5.6和MS5.1两次地震的模型误差(实线)及标准差(灰虚线)
Figure 9. Average residuals (solid line) and deviation (gray line) of two earthquakes
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图 10 乌鲁木齐MS5.1地震PGA(单位：cm/s2)分布图
(a)观测PGA; (b)基于GCMT数据的模拟PGA; (c)基于中国地震台网中心数据的模拟PGA
Figure 10. PGA distribution of the Vrümqi MS5.1 earthquake
(a) Observed PGA; (b) Simulated PGA based on the data from GCMT; (c) Simulated PGA based on the data from China Earthquake Networks Center
表 1 2013年乌鲁木齐MS5.6和MS5.1两次地震的震源参数
Table 1 Source parameters of two earthquakes with MS5.6 and MS5.1 occurred in Vrümqi Xinjiang, in 2013
发震日期 MW 震中位置 震源深度/km 节面Ⅰ 节面Ⅱ 参数来源 东经/° 北纬/° 走向/° 倾向/° 滑动角/° 走向/° 倾向/° 滑动角/° 03-29 5.4 86.96 43.52 38.5 167 51 -177 75 88 39 GCMT (2013) 03-29 5.5 86.85 43.46 34.0 256 88 45 164 45 177 USGS(2013a, b) 08-30 5.3 87.64 43.79 15.3 122 3 117 275 87 88 GCMT (2013) 08-30 5.0 87.64 43.76 12.0 81 88 -54 174 36 -176 中国地震台网中心(2013b) 
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