用数字化地震和模拟地震记录判别前震与前震系列的研究

On the Research of Foreshock and Foreshock Sequences by Using of Digital and Simulated Seismic Records

论述了由数字化地震记录测定震级谱、频谱的特征方法：将天文学上对天体星等色指数的办法移植到地震学中，用模拟地震记录测算４种震级标度所定义的震级，进而计算“震级色指数”，并用以判别地震系列的类型：ａ）红地震；ｂ）蓝地震；ｃ）前震型；ｄ）混合震群型；ｅ）单主余震型；ｆ）孤立型地震的频谱特征及其频谱成分标志。结合中国地区基准台和ＣＤＳＮ台网的记录，对汉堡大学杜达教授（Ｓ·Ｊ·Ｄｕｄａ）按地震系列中谱震级的高频成分和低频成分的比例划分为蓝地震和红地震的方法有所发展，提出了较为明确的判别指标。指出这将有助于识别前震与前震系列。

The paper recounted the characteristics of the magnitude spectrum and frequency spectrum determinated by using of the digital seismic record,the author transplated the method of the colour index of astromagnitude of astronomy to seismology.the 4 kinds of magnitude determinated by using of the simulated seismic record are used to define the colour index of magnitude,and the colour index of magnitude is used to distinguish the kinds of seismic sequence and the characters of the frequency spectrum and its composition sign of the frequency spectrum,the kinds of seismic sequence include:a) red earthquake, b) blue earthquake, c) foreshock type, d) mixed earthquake swarm type, e) single mainshock-aftershock type and f) isolated type.The author developed the method that professor S.J.Duda divided the blue earthquake and the red earthquake from the proportion of the high frequence component and the low frequence component of the spectrum magnitude in the seismic sequence combining the records of the standard station in China and the CDSN network,proposed the clear discriminant index,and suggested that it is conducive to recognize the foreshock or the foreshock sequence.