震前蒙城地震台地脉动噪声的特征
|
摘要
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.
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.
引文
[1]庄灿涛,阴朝民,吴忠良.数字地震观侧技术[M].北京:地震出版社,2003.
[2]林建生,张有明,谢文杰,等.泉州地震台数字地震仪台址的地脉动噪声分析[J].华南地震,2011.31(1):18—27.
[3]北京港震机电有限责任公司.数字地震仪参数测定软件使用手册[z].北京:北京港震机电有限责任公司.2005.
[4]郑现,赵翠萍,周连庆,等..利用背景噪声数据提取地震台站间面波的可靠性分析[J].地震学报,2013.35(2):218—228.
[5]王梅德,韩艳杰,郭祥云,等.地脉动在大震前的异常变化研究[J].地震研究,2014.37(1):73—78.
[6]李玲俐,王伟涛,朱良宝,等.从背景噪声提取瑞利面波频散曲线[J].地震2014.34(3):108—115.
[2]林建生,张有明,谢文杰,等.泉州地震台数字地震仪台址的地脉动噪声分析[J].华南地震,2011.31(1):18—27.
[3]北京港震机电有限责任公司.数字地震仪参数测定软件使用手册[z].北京:北京港震机电有限责任公司.2005.
[4]郑现,赵翠萍,周连庆,等..利用背景噪声数据提取地震台站间面波的可靠性分析[J].地震学报,2013.35(2):218—228.
[5]王梅德,韩艳杰,郭祥云,等.地脉动在大震前的异常变化研究[J].地震研究,2014.37(1):73—78.
[6]李玲俐,王伟涛,朱良宝,等.从背景噪声提取瑞利面波频散曲线[J].地震2014.34(3):108—115.