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用NORESS台阵记录的短周期P波比较了用三分量台站和台阵估算方位角和慢度的能力。对垂直台阵的资料,方位角和慢度用宽带频率-波数(f-k)分析方法得到。对三分量资料采用偏振分析方法,应用NORESS公报中的波至时间和主频信息,资料处理是自动的。用NEIS(美国地震情报处)公报或区域台网公报的定位结果独立确定的方位角和/或慢度作参考。对100多个远震和区域事件进行了分析。它们是从各种不同距离、方位角和较大范围的信噪比(SNR)资料中挑选出来的。三分量台站估算方位角和慢度的能力很大程度上取决于资料的信噪比。大约在信噪比阈值为2以下的资料,对两个参数的估算结果分散都很大,对远震事件的慢度倾向于估计过高。并且三分量资料结果在NORESS台阵内依赖于位置而变化,用宽带f-k方法获得的台阵测量在一定信噪比水平上不受噪声的明显影响。对于具有足够信噪比的事件,两种方法都很好,但f-k方法更好一点。
The short-period P wave recorded with the NORESS array compares the ability to estimate azimuth and slowness with a three-component station and array. The vertical array data, azimuth and slowness are obtained using the broadband frequency-wavenumber (f-k) analysis method. Polarization analysis is used for the three-component data, and the wave-to-time and dominant frequency information in the NORESS bulletin is applied and the data processing is automatic. Use azimuth and / or slowness, independently defined by the positioning results of the NEIS (United States Seismological Information Office) bulletin or the regional network communiqué for reference. More than 100 teleseismic and regional events were analyzed. They are selected from a wide range of signal-to-noise ratio (SNR) data at various distances, azimuths and angles. The ability to estimate the azimuth and slowness of a three-component station depends very much on the signal-to-noise ratio of the data. Information about a threshold below 2 for signal-to-noise ratio has large scatter in the estimation of both parameters, and tends to be too high for the slowness of teleseismic events. And the result of the three-component data changes depending on the position in the NORESS array. The array measurement obtained by the broadband f-k method is not affected obviously by the noise at a certain signal-to-noise ratio level. For events that have a good signal-to-noise ratio, both methods are good, but the f-k method is better.