强震临震微波动现象跟踪试验研究
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摘要
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.
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.
引文
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[2] 牛志仁,朱传镇.脉动与地震关系的初步探讨(二)[J].地球物理学报,1978,21(4):325-331.NIU Zhiren,ZHU Chuanzhen.Preliminary Study of The Microseisms in Relation to Earthquakes (2)[J].Chinese Journal of Geophysics,1978,21(4):325-331.
[3] 赵根模,杨港生,陈化然.寂静的前震与地震预测[J].地震,2001,21(1):69-76.ZHAO Genmo,YANG Gangsheng,CHEN Huaran.Quiescent Foreshock and Earthquake Prediction[J].Earthquake,2001,21(1):69-76.
[4] 许建聪.地脉动频谱结构与场地土动力响应研究[D].福州:福州大学,2003.XU Jiancong.Study on the Component of Frequency Spectrum of Microtremor,or and Response of Dynamics of Site Soil[D].Fuzhou:Fuzhou University,2003.
[5] 王梅德,韩艳杰,郭祥云,等.地脉动在大震前的异常变化研究[J].地震研究,2014,37(1):73-78.WANG Meide,HAN Yanjie,GUO Xiangyun,et al.Research on Anomaly Changes of Microtremor before Strong Earthquake[J].Journal of Seismological Research,2014,37(1):73-78.
[6] 杨立明.汶川地震临震地脉动记录特殊频率波动现象及其重现性初步研究[J].国际地震动态,2009,1:14-19.YANG Liming.Preliminary Study on the Tremors withSpecical Frequency Recorded by Seismograph Before Wenchuan Earthquake and Its Charaters[J].Recent Developments in World Seismology,2009,1:14-19.
[7] 杨立明,郝臻,王建军,等.汶川、玉树地震临震微波动现象的震例研究[J].国际地震动态,2015,9:62.YANG Liming,HAO Zhen,WANG Jianjun,et al.Study on Phenomenon of Microwave Fluctuation Before Wenchuan and Yushu Earthquake[J].Recent Developments in World Seismology,2015,9:62.
[8] 杨立明,郝臻,王建军,等.强震临震微波动现象初步研究(一)[J].中国地震,2018,34(2):219-233.YANG Liming,HAO Zhen,WANG Jianjun,et al.Preliminary Study on Phenomenon of Microwave Fluctuation Impending Strong Earthquake (1)[J].Earthquake Research in China,2018,34(2):219-233.
[9] 陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版,2000,172-184.CHEN Yuntai,WU Zhongliang,WANG Peide,et al.Digital Seismology[M].Beijing:Seismological Press,2000:172-184.
[10] 杨立明,郝臻,王建军,等.强震临震微波动现象初步研究(二)[J].中国地震,2018,34(2):234-243.YANG Liming,HAO Zhen,WANG Jianjun,et al.Preliminary Study on Phenomenon of Microwave Fluctuation Impending Strong Earthquake (2)[J].Earthquake Research in China,2018,34(2):234-243.