震前蒙城地震台地脉动噪声的特征

MENGCHENG SEISMIC STATION BEFORE THE EARTHQUAKE PULSATING NOISE CHARACTERISTICS

对本台数字化地震观测以来记录到的典型地震,运用数字地震信号处理方法,测算每个抽选地震震前一分钟地脉动信号在时间域和频率域的特征数据,通过频谱分析法,获得了震前地脉动噪声频谱的差异性。初步研究了典型地震震前地脉动频谱变化的特征和规律,共归纳了18类震前地脉动噪声类型,按照无震平静分钟值脉动频谱特征类比典型地震震前分钟值频谱的异样变化,发现正常与异常的地脉动噪声特征,最主要的还是受震级强度和地理位置的影响较大。临震前地脉动分钟值频谱特征异常,可用于震前脉动前兆异常变化跟踪,从而利用地脉动频谱的特征参量监测地震孕育过程,为地震中长期及短临预报提供依据。

Since the digital seismic observation records to the typical earthquake, the use of digital seismic signal processing method, measure each lottery earthquake one minute fluctuation signal in time domain and frequency domain feature data, through the spectrum analysis method, before the earthquake of pulsating noise spectrum in one minute difference. Preliminary study on the typical seismic shock of microtremor spectral variation characteristics and rules, and concluded 18 before the earthquake to pulse noise type, calm and no shock minute value fluctuation spectrum characteristics of analog typical earthquake shock minutes ago value spectrum of abnormal changes, found in the normal and abnormal Ground Microtremor noise characteristics according to.The most important is the impact of the magnitude and location of the larger. Before the earthquake, the pulsating minute value spectrum characteristics of abnormal, can be used before earthquakes ripple precursory anomaly change tracking, which use microtremor spectral characteristic parameters of seismic monitoring birth process, earthquake in long-term and short-term and impending prediction provides the basis.