利用乌鲁木齐遥测地震台记录识别人工爆破与地震
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摘要
选取乌鲁木齐遥测地震台记录的乌鲁木齐市附近人工爆破与天然地震资料 ,运用波谱分析、波形空间线性度等方法作对比研究 ,发现人工爆破与天然地震的波谱特征量和波形空间线性度多数情况下差异较大。在震级与震中距相近的条件下 ,主要差异表现在天然地震的纵、横波拐角频率 fc P和 fc S明显大于人工爆破 ,两者比值约为 2∶ 1 ;天然地震的最大谱值比 Ωm P/ Ωm S也明显大于人工爆破 ,两者比值约为 3∶ 1 ;地震 P波功率谱的频谱特征量 fm W、Δf W也比人工爆破大很多。这些差异可以作为识别人工爆破与天然地震的测震学指标。
A comparative research of the artificial explosion and nature earthquake data recorded by the Urumqi Digital Telemetry Seismic Station are made using methods of wave spectrum analysis and waveform space linearity. It is found that the wave spectrum characteristic value and waveform space linearity have much difference between the artificial explosion and nature earthquake. When they have close magnitudes and epicentral distances, the corner frequency f- cP of compression wave of the earthquake and the corner frequency f- cS of the transverse wave are larger than those of the explosion, the ratio about 2 to 1; the ratio of maximum spectrum value of the earthquake is also more than that of the explosion, about 3 to 1; and the frequency spectrum characteristic values of P-wave power spectrum of the earthquake ( f- mW, Δf-W ) are far more than those of the explosion. These differences can be taken as seismometric indexes for recognizing artificial explosion and nature earthquake.
A comparative research of the artificial explosion and nature earthquake data recorded by the Urumqi Digital Telemetry Seismic Station are made using methods of wave spectrum analysis and waveform space linearity. It is found that the wave spectrum characteristic value and waveform space linearity have much difference between the artificial explosion and nature earthquake. When they have close magnitudes and epicentral distances, the corner frequency f- cP of compression wave of the earthquake and the corner frequency f- cS of the transverse wave are larger than those of the explosion, the ratio about 2 to 1; the ratio of maximum spectrum value of the earthquake is also more than that of the explosion, about 3 to 1; and the frequency spectrum characteristic values of P-wave power spectrum of the earthquake ( f- mW, Δf-W ) are far more than those of the explosion. These differences can be taken as seismometric indexes for recognizing artificial explosion and nature earthquake.
引文
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[2]傅淑芳,刘宝诚.地震学教程[M].北京:地震出版社,1991.
[3]中国科学院地球物理研究所.近震分析[M].北京:地震出版社,1977.
[4]吴忠良,陈运泰,牟其铎.核爆炸地震学概要[M].北京:地震出版社,1994.
[5]F.谢尔鲍姆,J.约翰逊.朱元清译.地震数字信号处理——基本原理及应用软件[M].北京:地震出版社,1998.
[6]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000.
[7]郑治真.波谱分析基础[M].北京:地震出版社,1983.
[8]张少泉,徐子君,何建树,等.地震波分析与应用[M].北京:地震出版社,1998.
[9]许健生,尹志文.地震与爆破的波谱差异[J].地震地磁观测与研究,1999,20(3):18-23.
[10]巴特.地球物理学中的谱分析[M].北京:地震出版社,1978.
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