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昆仑山大地震(2001年11月14日)发生前三天,中国地震台网的多个台站都记录到了长周期的异常扰动信号.有研究认为昆仑山地震的震前扰动信号由玲玲台风产生,但是乌鲁木齐(WMQ)台站记录的扰动信号可能由慢地震事件引起;也有学者认为,WMQ台站的异常扰动信号与西亚的气旋活动有关.本文收集了中国台网及欧洲台站的数据.首先对昆仑山大地震前中国台网数据的分析,判断出WMQ台站扰动信号并非来源于玲玲台风;然后通过基于振幅衰减的格点搜索法对WMQ台站震前扰动信号进行定位,发现信号源位于波罗地海附近.针对WMQ台站异常扰动信号的频率分布特征,本文结合噪声互相关方法和单台法进行了深入分析,并利用美国国家环境预测中心的再分析数据探讨了异常扰动信号的产生机制.
In the first three days of the Kunlun Mountains Great Earthquake (November 14, 2001), many stations of China Seismological Network recorded long-period anomalous disturbance signals. Some studies suggest that the pre-quake disturbance signal from the Kunlun Mountains earthquake was produced by Lingling typhoon However, the disturbance signals recorded by Urumqi (WMQ) stations may be caused by slow earthquakes. Some scholars think that the signals of abnormal disturbance of WMQ stations are related to the cyclone activity in West Asia.This paper collects the data of China Taiwan Network and European stations. Firstly, the data of Chinese network before the Kunlun Mountains earthquake was analyzed, and it was found that the disturbance signal of WMQ station was not originated from Lingling typhoon. Then the grid disturbance signal located at WMQ station was located by grid search based on amplitude attenuation. Located in the vicinity of the Baltic Sea.According to the frequency distribution characteristics of abnormal disturbance signals of WMQ stations, this paper has conducted an in-depth analysis based on the noise cross-correlation method and single method, and explored the characteristics of abnormal disturbance signals using the reanalysis data of the National Center for Environmental Prediction The production mechanism.