强震临震微波动现象跟踪试验研究

Tracing Tests on the Phenomenon of Microwave Fluctuation Preceding Impending Strong Earthquakes

强震临震微波动是强震临震阶段优势频率集中在11～16 Hz、频谱形态较为整齐的临震异常脉动记录,在汶川、玉树、青川等不同强震前有重现,可用于强震临震判定。为了对强震临震微波动现象进行跟踪检验,利用"兰州地脉动实时监控技术系统"分析2015—2016年间发生在青藏块体和新疆的4次5.5级以上地震震前3个月地脉动连续记录,通过临震微波动事件活动度异常幅度变化和持续时间验证临震微波动现象的重现性,跟踪检验结果符合杨立明等基于临震微波动提炼的震情跟踪指标。

The phenomenon of microwave fluctuation before impending strong earthquakes is a type of anomalous pulsation record;its dominant frequency of spectrum focuses on 11-16 Hz and frequency spectral morphology appears fairly orderly.Microwave fluctuations occurred before the Wenchuan,Yushu,Qingchuan,and other strong earthquakes,and they can be used for predicting the strength of impending strong earthquakes.To conduct a tracing test on such microwave fluctuations,continuous records of microtremors were analyzed using the “real-time monitoring technology system of microtremor in Lanzhou”;these microtremors occurred in the three months before four M ≥5.5 earthquakes which occurred in the Qinghai-Tibet Block and Xinjiang area during 2015 and 2016.The reproducibility of the microwave fluctuation of impending earthquakes was verified by the abnormal amplitude change and duration of microwave fluctuation.The tracking test results were in accordance with seismic tracking indexes based on the microwave fluctuation preceding impending earthquakes proposed by Yang Liming.