宽频带数字资料低频波在大震前的短临前兆信息研究
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摘要
通过对高台、兰州、成都、安西地震台宽频带数字资料在2001年昆仑山口西8.1级地震,2008年汶川8.0级地震以及2003年山丹、民乐6.1级地震前低频波频谱变化的研究,总结了数字资料在频率域上的短临前兆异常特征,发现0.1~0.14 Hz频幅在震前几天成逐渐增强的趋势。并结合震源区构造特征对前兆机理进行了探讨。认为低频波的产生与静地震和慢地震有关。
Through the studing on the broadband digital seismic data from Gaotai,Lanzhou,Chengdu and Anxi seismic stations,the spectral variation of low-frequency wave before the west to Kunlun Mountain Pass earthquake with MS=8.1 in 2001,Wenchuan MS8.0 earthquake in 2008 and Minle-Shandan MS6.1 earthquake in 2003,is analyzed,and the characteristics of short-impending term precursory anomaly in the data is summarized in frequency domain.I t is found that the amplitude of frequency in 0.1~0.14 Hz increases gradually in a few days before strong earthquake.The mechanism of the anomaly is discussed also combined with tectonic features of the earthquake source area and the low-frequency wave is considered has relation with quiet-earthquake and slow-earthquake.
Through the studing on the broadband digital seismic data from Gaotai,Lanzhou,Chengdu and Anxi seismic stations,the spectral variation of low-frequency wave before the west to Kunlun Mountain Pass earthquake with MS=8.1 in 2001,Wenchuan MS8.0 earthquake in 2008 and Minle-Shandan MS6.1 earthquake in 2003,is analyzed,and the characteristics of short-impending term precursory anomaly in the data is summarized in frequency domain.I t is found that the amplitude of frequency in 0.1~0.14 Hz increases gradually in a few days before strong earthquake.The mechanism of the anomaly is discussed also combined with tectonic features of the earthquake source area and the low-frequency wave is considered has relation with quiet-earthquake and slow-earthquake.
引文
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[20]杨立明,王振亚,郑卫平,等.青藏高原北部地区7级以上地震孕育演化特征及其应用研究[J].西北地震学报,2000,22(2):147-153.
[21]杨立明,肖丽珠,张小美,等.青藏高原北部地震活动形势及其与中国大陆地区地震活动的关系研究[J].西北地震学报,2001,23(3):244-249.
[2]杨又陵,赵根模,高国英.昆仑山8.1地震前的缓慢地震事件[J].国际地震动态,2003,297(9):1-4.
[3]许绍燮.大地震地层内的分层运动[J].中国工程科学,2006,8(6):14-22.
[4]Ito Y,Obra K,Shiomi K,et al..Slowearthquakes coincidentwith episodic tremors and slowslip events[J].Science,2007.315(5811):503-506.
[5]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讨[J].国际地震动态,2009,361:14-19.
[6]张雁冰,蒋骏,廖盈春.宽频地震计及倾斜、重力仪对长周期波动信号的综合观测[J].地震学报,2008,30(6):626-633.
[7]Dragoni M,Bonafede E Boschie.Silent earthquake and rupturemechanics along plate boundaries[J].Earthquake Predict Res.1986,(4):121-129.
[8]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.
[9]许绍永,杨润海,胡毅力.慢地震慢机制的研究[J].地震,2003,23(2):12-20.
[10]吴志坚,车爱兰,王兰民.常时微动测试在汶川地震甘肃灾区建筑结构震害调查中的应用[J].西北地震学报,2009,31(1):86-90.
[11]周青云,何永锋,靳平.地震信号处理中相位匹配滤波器的设计[J].西北地震学报,2007,29(2):114-118.
[12]安张辉,吕子岚,杜学彬.甘肃省各数字测震台下方地壳速度结构研究[J].西北地震学报,2008,30(3):270-275.
[13]姚凯,卢大伟,刘旭宙.利用汶川余震流动观测资料探讨地形对峰值加速度的影响[J].西北地震学报,2009,31(1):46-50.
[14]陈立军.禾青井动水位对断层蠕动与慢地震过程的响应初析[J].华南地震,1997,17(2):40-44.
[15]韩延本李志安,田静.日月引潮力变化与某些地区地震发生时间的相关研究[J].地球物理学进展,1996,11(2):114-122.
[16]王庆良,张晓东,崔笃信,等.理解前兆异常变化机理和地震短临前兆[J].国际地震动态,2005,(5):131-144.
[17]杨立明,王兰民.民乐-山丹6.1级地震短期预报的科学总结[J].西北地震学报,2004,26(1):1-9.
[18]杨立明,梅秀萍.地震活动相关性定量方法及其在印度板块动力触角对中国西部地区地震影响中的应用[J].西北地震学报,2005,27(4):317-321.
[19]刘小凤,杨立明,范兵.昆仑山口西8.1级地震后青藏高原北部地区地震活动初步研究[J].西北地震学报,2003,25(1):52-58.
[20]杨立明,王振亚,郑卫平,等.青藏高原北部地区7级以上地震孕育演化特征及其应用研究[J].西北地震学报,2000,22(2):147-153.
[21]杨立明,肖丽珠,张小美,等.青藏高原北部地震活动形势及其与中国大陆地区地震活动的关系研究[J].西北地震学报,2001,23(3):244-249.
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