东北地区地震活动的Rydelek-Sacks周期性检验和震级-周期谱研究
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摘要
为检验中国东北地区地震活动可能存在的周期性特征和深、浅源地震在周期性活动上的相关性,利用Rydelek-Sacks检验方法和不同的地震目录,考虑了地震震级的选取对周期性特征识别可能存在的影响,并在震级-周期谱中进行了比较研究.对该地区1970—2009年ML≥4.5浅源地震、1920—2009年MS≥5.0浅源地震和1905—2009年MS≥6.0深源地震的周期性检验结果表明:①东北地区深源地震活动存在明显和稳定的周期性活动;②浅源地震的周期性活动可能存在震级相依关系;③深源地震与ML4.5—5.0浅源地震在复发周期上存在较好的相关性,表明中国东北地区深源地震在周期相关性角度对浅源地震的影响可能比传统认识的MS5.0地震震级更小.
For distinguishing the potential periodicity and the relationship between shallow and deep earthquakes in northeastern China,this paper conducted the Rydelek-Sacks test based on various earthquake catalogues to consider the influence of selected magnitudes on the periodicity.The test for the periodicity distinguishing was investigated by using shallow earthquakes from 1970 to 2009 with magnitude no less than ML4.5,1920 to 2009 with magnitude no less than MS5.0 and deep earthquakes from 1905 to 2009 with magnitude no less than MS6.0.Major results of our study are:① Deep earthquakes in northeastern China region have an obvious and stationary active period;② Periodicity of shallow earthquakes probably depends on magnitude;③ Good correlation between deep earthquakes and ML4.5—5.0 shallow ones show that in northeastern China deep earthquakes may influence on the shallow earthquakes with magnitude even lower than MS5.0.This fact is beyond our traditional knowledge.
引文
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