兰州台阵响应函数及不同方位小地震事件FK分析结果
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摘要
计算了兰州台阵不同频率的台阵响应函数,对台阵附近不同方位的4个小震进行了FK分析。结果显示兰州台阵2 Hz以下的台阵响应函数在原点附近呈现出对称的单主峰图样,而高于2Hz时台阵响应函数出现较多旁瓣,表明该台阵对于2 Hz以下的信号具有较好的分辨能力。小震的FK分析结果表明,根据甘肃省地震局地震目录和IASP91速度模型计算得到P波方位角和慢度与FK分析的结果总体上比较一致,但也存在一定差别,这种差别可能由所使用的理论模型和当地模型有差别以及未做台阵校正所引起。
The array response function of Lanzhou seismic array is calculated in different frequencies.Four small earthquakes in different azimuths are analyzed with FK method.The results indicate that there is a main peak in the image of FK analysis in frequency smaller than 2 Hz,and many side slobes correspond with higher frequencies,which indicate that the array has good ability to resolve the signals with frequency less than 2 Hz.The results of FK method for 4 small earthquakes indicate that the azimuth and slowness estimated by FK analysis are mainly consistent with the results calculated by seismic catalog referring IASP91 velocity model,but there is difference between both results.The difference maybe caused by difference between the velocity structure beneath the array and the IASP91 model,as well as no application of array correction.
The array response function of Lanzhou seismic array is calculated in different frequencies.Four small earthquakes in different azimuths are analyzed with FK method.The results indicate that there is a main peak in the image of FK analysis in frequency smaller than 2 Hz,and many side slobes correspond with higher frequencies,which indicate that the array has good ability to resolve the signals with frequency less than 2 Hz.The results of FK method for 4 small earthquakes indicate that the azimuth and slowness estimated by FK analysis are mainly consistent with the results calculated by seismic catalog referring IASP91 velocity model,but there is difference between both results.The difference maybe caused by difference between the velocity structure beneath the array and the IASP91 model,as well as no application of array correction.
引文
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[2]许健生,赵仪全,苏向州,等.兰州大尖山地震台阵勘址[J].地震地磁观测与研究,2006,27(B08):51-57.
[3]郝春月,郑重,周公威.兰州台阵勘址测点的功率谱估计与分析[J].地震地磁观测与研究,2002,23(3):-
[4]郝春月,郑重,牟磊育.兰州台阵勘址测点对相干函数的计算与分析[J].地震地磁观测与研究,2002,23(4):29-33
[5]郝春月,郑重,郭燕平,等.中国数字地震台网(CDSN)和IMS/PS台阵的监测定位能力评估[J].地震地磁观测与研究,2006,27(2):56-63.
[6]郝春月,郑重,周公威.兰州台阵勘址测点相关值曲线的计算分析与初选台阵评估[J].地震学报,2003,25(6):608-614.
[7]佟玉霞,朱元清.上海地震台阵响应图及其计算方法估[J].地震地磁观测与研究,2002,23(2):47-54.
[8]于海英,朱元清.频率-波数分析基础理论及上海地震台阵响应分析[J].地震研究,2006,29(3):312-316.
[9]Bormann P,I ASPEI.New Manual of Seismological Observa-tory Practice[M].Potsdam:Geoforschungszentrum,2002.
[10]Kennett B L N,Engdahl E R.Travel ti mes for global earth-quake location and phase identification[J].Geophys J Int.,1991,105:429-465.
[11]王爱国,袁道阳,梁明剑.兰州盆地最大潜在地震变形数值模拟[J].西北地震学报,2008,3:232-238.
[12]卢育霞,王振明,王兰民,等.兰州盆地活断层的高分辨率浅层地震勘探技术[J].西北地震学报,2008,30(4):344-353.
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