探测与2014年新疆于田MS7.3地震相关的大气CO和O3异常变化

基于AQUA AIRS传感器提取了2014年2月12日新疆于田M_S7.3地震前后CO和O₃数据, 讨论了数据变化与地震活动的关系。 差值法和异常指数法结果表明, 于田地震后CO和O₃在3月份达到最大异常, 且气体柱浓度异常沿NE向发震构造呈线性分布; 不同高度的CO和O₃的VMR值变化与差值法和异常指数法得到的结果相吻合; 地震前后短时间内CO和O₃气体柱浓度出现下降, 且地震当月最低。 初步推断可能是阿尔金断裂尾部在SW向运动过程中使得震区断裂带在弹性挤压状态下出现闭锁, 气体不流通导致; CO和O₃异常更多的可能是由于田地震引起地下气体大量释放, 其次可能是与地下气体逸散在大气圈中发生的一系列化学反应有关。 研究表明, 卫星高光谱遥感数据获得的CO和O₃的地球化学信息与地震有密切联系, 在地震监测及预测领域具有重要的应用价值。

Detecting Anomalies of Atmospheric Total Column CO and O3 Related to the 2014 Yutian MS7.3 Earthquake

The data of CO and O₃ before and after the M_S7.3 earthquake of Yutian in Xinjiang on February 12, 2014 was extracted based on the AQUA AIRS sensor, and the relationship between data changes and seismic activity was discussed. The results of difference value method and anomaly index method showed that there are CO and O₃ reached the maximum anomaly in March after the earthquake, and the anomalous distribution of gas total column and seismogenic structure showed a linear NE distribution. The change in VMR values for CO and O₃ at different heights is consistent with this result. The CO and O₃ total column decreased in a short time before and after the earthquake, and the gas total column was the lowest in the month of the earthquake. The preliminary conclusion may be that the tail of the Altun fault caused the blockage of the earthquake zone to be locked under elastic compression during the movement of the SW, and the gas did not flow. The CO and O₃ anomalies are more due to the large release of underground gas caused by the Yutian earthquake, and secondly may be related to a series of chemical reactions in which the underground gas escapes in the atmosphere. The results indicate that geochemical information of CO and O₃ obtained by satellite hyperspectral remote sensing can be connected with earthquake, indicating potential application in monitoring and forecasting earthquake.