Spatio-temporal dynamic variation of thermal anomalies before and after the 2005 Jiujiang MS5.7 earthquake based on the modulation of additive tectonics stress induced by tide-generating force
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摘要: 通过利用发震区域的天体引潮力附加构造应力变化模型， 研究了2005年11月26日江西九江MS5.7地震发震构造与天体潮汐引力的关系， 并利用该模型结合美国国家环境预报中心多源综合温度数据资料， 分析了九江地震前后发震区域热异常在时空上的动态变化特征. 结果显示, 一方面， 在时间序列变化上， 孕震区热异常表现出的起始—消亡演变过程与岩石在应力加载下的形变—破裂过程相吻合. 无论近地表大气还是上附多层大气， 热异常主要集中在活动断裂带及其附近区域， 与构造断裂带分布相一致； 同时， 热异常从近地表到高空消失的垂向分布， 符合地面对大气加热导致大气升温→抬升→扩散→消亡的大气动力学基本特性， 表明构造运动是本次温度异常变化的主控原因. 另一方面， 热异常变化遵循引潮力(低值—高值—低值)的变化过程， 显示出天体引力对发震断层温度异常识别具有一定的指示意义以及引潮力可能对构造应力处于临界状态的发震断层具有诱震作用， 预示利用引潮力附加构造应力与热异常变化相结合研究短临地震预测具有一定价值.Abstract: A variation model of additive tectonics stress caused by celestial tide-generating force was put forward to explain its relationship with seismic fault sliding.By applying the model, we analyzed spatio-temporal dynamic evolution characteristics of thermal anomaly based on the multi-source temperature data from National Center for Environmental Prediction (NCEP) of USA before and after the MS5.7 earthquake in Jiujiang, China on November 26, 2005. The results indicate that, on one hand, the evolution of thermal anomaly from initial growth to extinction coincided with the process of rock under the stress from deformation to breaking in time series. The areas of temperature increasing either in near-surface atmospheric layer or in the multi-layers above distributed mainly in active fault zones and their vicinities, which is agreement with the distribution of tectonic fault zones. Furthermore, the vertical distribution of thermal anomaly from near-surface to upper air went through the following stages: atmospheric warming caused by surface heating→lifting→diffusion→disappear, which accords with the basic characteristics of atmospheric dynamics, indicating that tectonic movement was the main cause of the change in the temperature anomalies. On the other hand, the abnormal variations of temperature followed the cyclical change (low-high-low) of tide-generating force, which showed that the astro-tidal triggering had a particular indicative significance for the identification of temperature anomaly on seismic faults, and it could trigger an earthquake when the tectonic stress was in critical status. It indicated that the method of combining additive tectonics stress caused by tide-generating force with thermal anomaly change could be used for the studies of short-impending earthquake prediction.
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Keywords:
- thermal anomaly /
- vertical structure /
- additive tectonics stress
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图 1 2005年九江MS5.7地震构造图F1: 庐江—广济断裂; F2: 襄樊—广济断裂; F3: 丁家山—郎君山—桂林桥—武宁断裂；F4: 九江—靖安断裂; F5: 湖口—新干断裂
Figure 1. Map showing seismogenic structures in Jiujiang MS5.7 earthquake area F1: Lujiang-Guangji fault; F2: Xiangfan-Guangji fault; F3: Dingjiashan-Langjunshan-Guilinqiao-Wuning fault; F4: Jiujiang-Jing’an fault; F5: Hukou-Xin’gan fault
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图 2 2005年九江MS5.7地震天体引潮力附加构造应力P和T的变化
Figure 2. The change of additive tectonic stresses P and T caused by astro-tidal-triggering for the Jiujiang MS5.7 earthquake in 2005
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图 3 九江MS5.7地震前后大气增温异常时空动态演变特征(世界时18:00)(图中F1—F5同图 1)
Figure 3. Spatio-temporal dynamic evolution characteristics of abnormal temperature increase at 18:00 (UTC) before and after Jiujiang MS5.7 earthquake in 2005 The faults F1—F5 have the same meaning as those in Fig. 1
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图 4 2003年大姚MS6.1地震天体引潮力附加构造应力P和T的变化
Figure 4. The change of additive tectonic stressesP and T caused by astro-tidal-triggering for the Dayao MS6.1 earthquake in 2003
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