| 强震临震微波动现象初步研究(二) |
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| 引用本文： | 杨立明,郝臻,王建军,张淑珍,姚家俊,董蕾.强震临震微波动现象初步研究(二)[J].中国地震,2018,34(2):234-243. |
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| 作者姓名： | 杨立明 郝臻 王建军 张淑珍 姚家俊 董蕾 |
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| 作者单位： | 中国地震局兰州地震研究所;青海省地震局;中国地震局地球物理勘探中心;重庆市地震局 |
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| 基金项目： | “十二·五”国家科技支撑计划专题“数字地震技术在强震中短期预测中的应用”（2012BAK19B02-01）资助 |
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| 摘 要： | 为了验证和检验强震临震微波动现象及其主要特征,利用甘、青、川、滇、藏等区域台网200余个宽频带数字地震台站的波形资料,建立了实时监控技术系统。通过对2012~2014年间青藏块体发生的24次5级以上地震及部分无震区域台站观测的全程实时跟踪、动态监控,检验和验证了临震微波动现象的重现性和客观性,验证了临震微波动现象的频谱、时间、空间、方向性等特征,进一步得出了临震微波动现象可能与地震强度有关,且震级越大,震前出现持续临震微波动的可能性越大的结论。
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| 关 键 词： | 临震微波动 优势频率11~16Hz 震源区预活动 |
| 收稿时间： | 2017/7/10 0:00:00 |
| 修稿时间： | 2017/11/19 0:00:00 |
Preliminary Study on Phenomenon of Microwave Fluctuation Impending Strong Earthquake(2) |
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| Yang Liming,Hao Zhen,Wang Jianjun,Zhang Shuzhen,Yao Jiajun and Dong Lei.Preliminary Study on Phenomenon of Microwave Fluctuation Impending Strong Earthquake(2)[J].Earthquake Research in China,2018,34(2):234-243. |
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| Authors: | Yang Liming Hao Zhen Wang Jianjun Zhang Shuzhen Yao Jiajun and Dong Lei |
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| Institution: | Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China;Qinghai Earthquake Agency, Xining 810001, China,Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China,Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China,Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China,Geophysical Exploration Center, CEA, Zhengzhou 450002, China and Chongqing Earthquake Agency, Chongqing 401147, China |
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| Abstract: | Based on the digital broad-band seismic records,the microwave fluctuation impending earthquake was identified preliminarily through the repeated comparative study of Wenchuan,Yushu,Qingchuan and other earthquakes. Its characteristics are as follows:(1)Dominant frequency of spectrum focuses on 11-16Hz. The spectrum range is relatively wide and its morphology is comparatively neat.(2)The phenomenon observed 12-14 days before the earthquake may be recorded by a station with the epicenter distance within 50km.(3)Directional feature is found,and the direction of significant changes in activity is consistent with the causative fault,aftershock distribution,and source locations. The phenomenon of microwave fluctuation impending earthquake can be related to events such as pre-slip,micro-vibration,micro-fracturing in source areas or some related tectonic activities such as micro-activities,micro-cracks,propagations of cracks during the imminent phase. |
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| Keywords: | Microwave fluctuation impending earthquake Dominant frequency 11-16Hz Pre-activities of source area |
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