新疆两次强震前后地震视应力变化
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摘要
选取了喀什数字地震台记录的喀什及周边地区地震的宽频带波形资料,分析处理了2001～2005年MS3.5以上地震164次,通过数字地震波谱计算了标量地震矩和地震辐射能量,从而进行了视应力的计算。给出了巴楚-伽师MS6.8和乌什MS6.3强震前后视应力的时序变化情况,发现其视应力均表现出震前低应力阶段-主震前的逐渐上升-震后逐渐恢复的动态变化过程,即地震的孕震-发震-震后调整的阶段性变化特征。这一结果可为喀什及周边地区今后进行地震预测预报研究提供参考依据,对该区开展数字地震方面的研究也有所帮助。
In this paper,using the wide-band digital seismic waveform data of earthquake occurred in kash and adjacent area,which selected from the data recorded at Kashi Digital Seismic Station,we analyzed and processed 164 earthquakes of MS > 3.5 during 2001 to 2005.With the wave spectra of earthquakes,the scale seismic moment and seismic radiant energy are calculated and further the apparent stress are calculated.The temporal variation of the apparent stress before and after the two strong earthquakes,Bachu-Jiashi of MS 6.8 and Wushi of MS 6.3,are obtained.The dynamic variation processes of apparent stress,which presented as a low stress stage before the earthquake,then stress increasing gradually near main shock and stress recovering after earthquake,are found.It shows a staggered variation characteristic of the process of earthquake gestation,occurrence,and adjustment.The results provide the reference information for the earthquake forecasting in kashi and its adjacent area.It will also be helpful for the digital seismic research in the area.
In this paper,using the wide-band digital seismic waveform data of earthquake occurred in kash and adjacent area,which selected from the data recorded at Kashi Digital Seismic Station,we analyzed and processed 164 earthquakes of MS > 3.5 during 2001 to 2005.With the wave spectra of earthquakes,the scale seismic moment and seismic radiant energy are calculated and further the apparent stress are calculated.The temporal variation of the apparent stress before and after the two strong earthquakes,Bachu-Jiashi of MS 6.8 and Wushi of MS 6.3,are obtained.The dynamic variation processes of apparent stress,which presented as a low stress stage before the earthquake,then stress increasing gradually near main shock and stress recovering after earthquake,are found.It shows a staggered variation characteristic of the process of earthquake gestation,occurrence,and adjustment.The results provide the reference information for the earthquake forecasting in kashi and its adjacent area.It will also be helpful for the digital seismic research in the area.
引文
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史勇军,吴忠良,徐果明.2005.中小地震宽频带辐射能量的单台测定[J].中国地震,21(1):24～32
吴忠良.2001.由宽频带辐射能量目录和地震矩目录给出的视应力及其地震学意义[J].中国地震,17(1):8～15
吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293～301
庄灿涛,阴朝民,吴忠良主编.2003.数字地震观测技术[M].北京:地震出版社
张国民,傅征祥等.2001.地震预报引论[M].北京:科学出版社
中国地震局监测预报司.2003.地震参数—数字地震学在地震预测中的应用[M].北京:地震出版社
Andrews DJ.1986.Objective determination of source parameters and similarity of earthquakes of different siza[R].In:DasS,Boatwright J.and Scholz C H(eds.),Earthquake Source Mechanics.Washington D C:AGU,259～267
Boatwright J,Choy G Land Seekins L C.2002.Regional estimates of radiated seismic energy[J].Bull SeismSoc Amer,92,1241～1255
Brune J N.1970.Tectonic stress and spectra of seismic share wave fromearthquake[J].J Geophys Res,75,4997～5009
Brune J N.1971.Correction[J].J Geophys Res,76,5002
Choy G L,Boatwright J L.1995.Global patterns of radiated seismic energy and apparent stress[J].J Geophys Res,100,18205～18228
Kanamori H,Heaton T H.2000.Microscopic and macroscopic physics of earthquakes[R].In:Rundle J B,Turcotte D L,Klein W.(eds)GeoComplexity and the Physics of Earthquakes.Washington D C:AGU,147～163
Wyss M,Brune J N.1968.Seismic moment,stress,and source dimensions for earthquakes in the California-Nevada region[J].J Geophys Res,73,4681～4694
史勇军,吴忠良,徐果明.2005.中小地震宽频带辐射能量的单台测定[J].中国地震,21(1):24～32
吴忠良.2001.由宽频带辐射能量目录和地震矩目录给出的视应力及其地震学意义[J].中国地震,17(1):8～15
吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293～301
庄灿涛,阴朝民,吴忠良主编.2003.数字地震观测技术[M].北京:地震出版社
张国民,傅征祥等.2001.地震预报引论[M].北京:科学出版社
中国地震局监测预报司.2003.地震参数—数字地震学在地震预测中的应用[M].北京:地震出版社
Andrews DJ.1986.Objective determination of source parameters and similarity of earthquakes of different siza[R].In:DasS,Boatwright J.and Scholz C H(eds.),Earthquake Source Mechanics.Washington D C:AGU,259～267
Boatwright J,Choy G Land Seekins L C.2002.Regional estimates of radiated seismic energy[J].Bull SeismSoc Amer,92,1241～1255
Brune J N.1970.Tectonic stress and spectra of seismic share wave fromearthquake[J].J Geophys Res,75,4997～5009
Brune J N.1971.Correction[J].J Geophys Res,76,5002
Choy G L,Boatwright J L.1995.Global patterns of radiated seismic energy and apparent stress[J].J Geophys Res,100,18205～18228
Kanamori H,Heaton T H.2000.Microscopic and macroscopic physics of earthquakes[R].In:Rundle J B,Turcotte D L,Klein W.(eds)GeoComplexity and the Physics of Earthquakes.Washington D C:AGU,147～163
Wyss M,Brune J N.1968.Seismic moment,stress,and source dimensions for earthquakes in the California-Nevada region[J].J Geophys Res,73,4681～4694
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