【摘要】 将Schaff和Richards所选的通过远震波形相关得到的分布在辽宁地区的23对"重复地震",利用辽宁区域地震台网记录的波形资料进行相关计算,得到辽宁区域台网波形相关意义上的"重复地震",并与Schaff和Richards的结果进行了对比分析.利用辽宁区域台网得到的"重复地震"对辽宁区域地震台网的震相拾取和地震定位进行了评估.结果表明,远震波形相关意义上的"重复地震"与区域台网波形相关意义上的"重复地震"有一定差别,它们只有部分交集.但是,从总体上评估辽宁区域台网的定位能力和震相拾取误差,用两种方法得到的"重复地震"所给出的评估结果无实质差别尽管用区域台网得到的"重复地震"似乎效果更好.基于"重复地震"之间在理论上距离应小于1km的工作假定,可以得到辽宁区域台网地震目录中的定位误差在5km之内,平均为2km;Pg震相的拾取误差94%在±1s之间,Sg震相的拾取误差88%在±1s之间.更多还原

【Abstract】 In the list of ’repeating pairs’ or ’doublets’ of earthquakes in China identified by Schaff and Richards using teleseismic waveform cross-correlation there were 23 repeating pairs located in Liaoning Province. In this study the waveforms of these events were cross-correlated using records from Liaoning Regional Seismograph Network (LRSN), and the ’repeating events’ in the sense of regional waveform cross-correlation were obtained. The result was compared with that of Schaff and Richards and was used for the assessment of the seismic phase picking and event location practice of LRSN. The result shows that ’repeating events’ in the sense of teleseismic waveform cross-correlation and those in the sense of regional waveform cross-correlation have significant difference, although with some overlap. However, the overall assessment of the location accuracy and the phase pick errors of LRSN by using these two sets of ’repeating events’, respectively, provides similar result, while ’repeating events’ in the sense of regional waveform cross-correlation seem to be better performing in such an assessment. With the assumption that the separation between the ’repeaters’ be less than 1 km, the uncertainty in routine earthquake location of LRSN is estimated to be below 5 km, with the average of 2 km. In the observational bulletins of LRSN the time error in phase picking is estimated to be within ±1 s for 94% Pg readings and for 88% Sg readings.更多还原