用小波变换能量线性度方法识别天然地震与爆破或塌方

USING METHOD OF ENERGY LINEARITY IN WAVELET TRANSFORM TO DISTINGUISH EXPLOSION OR COLLAPSE FROM NATURE EARTHQUAKE

摘要:

为了提取天然地震和爆破或塌方记录波形在震源深度、震源尺度、震源破裂机制、地震波传播途径、地震波衰减等方面的差异特征信息,本文对山东数字化台网记录的天然地震和爆破或塌方波形进行了小波多分辨率的能量线性度特征分析,提出了用小波变换能量线性度方法识别天然地震与爆破或塌方事件.结果表明:在精细结构小波分解信号"能量"线性度方面,天然地震主要集中在-2.0~1.0之间,爆破或塌方主要集中在2.0~3.4之间;在精细结构小波分解信号"能量"最大值对应的小波分解尺度方面,爆破或塌方主要集中在4~5,频段集中在0.7~3.1 Hz之间,而天然地震主要集中在1~2,频段集中在6.25~25 Hz之间.

Abstract:

In order to extract the difference information from the recorded waveforms of natureral earthquake and explosion or collapse in seismic focus depth, seismic focus scale, seismic focus break mechanism, seismic wave travel path and seismic wave attenuation, the energy linearity characteristics of wavelet multiresolution from the records of some nature earthquakes, explosions and collapses in Digital Seismic Network of Shangdong prov. are analysed, and a new method of energy linearity in wavelet transform is put forward to distinguish explosion or collapse from nature earthquake. The result indicates that in energy linearity of fine structure wavelet decomposition signal, the range of nature earthquake is from -2.0 to 1.0, but the range of explosion or collapse is from 2.0 to 3.4; in wavelet decomposition scale corresponding to maximum energy of fine structure wavelet decomposition signal, the range of nature earthquake is from 1 to 2 and the frequency is from 6.25 to 25 Hz respectively, but the range of explosion or collapse is from 4 to 5 and the frequence is from 0.7 to 3.1 Hz.