邢台地区近年的震源机制
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摘要
利用首都圈和邯郸数字地震遥测台网2002年以来的资料,采用理论地震图拟合观测波形的方法,得到邢台地区96次ML≥2.0地震的震源机制解。分析表明:1)地震主要分布在1966年邢台地震区内,呈共轭交汇条带,因此可以作为邢台地震序列的延续;2)震源机制解应力轴的优势取向和序列早期与华北其它强震的相同,说明该地构造应力场与华北区域构造应力场一致;3)机制解节面占优的走向以NNE-NE和NWW-NW为最多,和序列早期的破裂方向一致,证实近年的中小地震活动具有继承性;4)震源机制类型多样,表明当地的应力水平有别于序列早期。
On the basis of the observations from the digitalized telemetric seismic network of the Capital area and Handan since 2002,focal mechanism solutions of 96 earthquakes(ML≥2.0) are inversed by fitting the observed waveforms under the theoretical seismogram.It shows that: 1)Recent earthquakes are distributed in conjugate convergent belts within the Xingtai seismicity region ever since 1966,which can be considered as the current state of the Xingtai earthquake sequences;2)The predominant stress axis orientation of focal mechanism is the same as that of the forepart of Xingtai earthquake sequences as well as other strong earthquakes in North China,it implies that this region was controlled by the same tectonic stress field as in whole North China;3)The dominate nodal plane orientations are mainly in directions of NNE-NE and NWW-NW and consistent with the rupture direction of forepart earthquakes of Xingtai seismic sequences,it demonstrates the inherited seismicity of current moderate and small earthquakes;4) The diversity of focal mechanism indicates that the local tectonic stress field is in lower state,and different from the focal mechanisms of forepart of Xingtai earthquake sequences,so the possibility of strong earthquake is not high.
On the basis of the observations from the digitalized telemetric seismic network of the Capital area and Handan since 2002,focal mechanism solutions of 96 earthquakes(ML≥2.0) are inversed by fitting the observed waveforms under the theoretical seismogram.It shows that: 1)Recent earthquakes are distributed in conjugate convergent belts within the Xingtai seismicity region ever since 1966,which can be considered as the current state of the Xingtai earthquake sequences;2)The predominant stress axis orientation of focal mechanism is the same as that of the forepart of Xingtai earthquake sequences as well as other strong earthquakes in North China,it implies that this region was controlled by the same tectonic stress field as in whole North China;3)The dominate nodal plane orientations are mainly in directions of NNE-NE and NWW-NW and consistent with the rupture direction of forepart earthquakes of Xingtai seismic sequences,it demonstrates the inherited seismicity of current moderate and small earthquakes;4) The diversity of focal mechanism indicates that the local tectonic stress field is in lower state,and different from the focal mechanisms of forepart of Xingtai earthquake sequences,so the possibility of strong earthquake is not high.
引文
1梁尚鸿,李幼铭,束沛镒,等.利用区域地震台网P-、S-振幅比资料测定小震震源参数[J].地球物理学报,1984,27(3):247~257.1 Liang Shanghong,Li Youming,Shu Peiyi,et al.On the de-termining of source parameters of small earthquakes by usingamplitude rations of-PandS-from regional network observa-tions[J].Acta Geophysica Sinica,1984,27(3):247-257.(in Chinese)
2林纪曾,等.粤东、闽南沿海小震震源参数的测定研究[J].地震学报,1991,13(4):420~429.2 Lin Jizeng,et al.Determination of source parameters of smallearthquakes in the east part of Guangdong and south part ofFujian province[J].Acta Seismologica Sinica,1991,13(4):420-429.(in Chinese)
3胡新亮,等.利用数字地震记录的P-、S-振幅比资料测定小震震源机制的可靠性分析[J].地震地质,2004,26(2):347~354.3 Hu Xinliang,et al.Reliability analysis of focal mechanismsolutions of micro-earthquakes determined from amplitude ra-tio of-Pand-Srecorded by digital seismograph[J].Seismolo-gy and Geology,2004,26(2):347-354.(in Chinese)
4刁桂苓,于利民.震源机制解的系统聚类分析:以海城地震为例[J].中国地震,1992,8(3):86~92.4 Diao Guiling and Yu Limin.Hierarchical clustering analysisof the focal mechanism solution——taking the Haichengearthquake sequences for example[J].Earthquake Researchin China,1992,8(3):86-92.(in Chinese)
5鄢家全.中国及邻近地区现代构造应力场的区域特征[J].地震学报,1979,1(1):17~29.5 Yan Jiaquan.Some featunes of the recent tectonic stress fieldof the environs[J].Acta Seismologica Sinica,1979,1(1):9-24.(in Chinese)
6刁桂苓.震源机制[A].一九六六年邢台地震[C].北京:地震出版社,1986.6 Diao Guiling.Focal mechanism[A].Xingtai earthquake in1966[C].Beijing:Seismological Press,1986.(in Chinese)
7陈颙.用震源机制一致性作为描述地震活动性的新参数[J].地球物理学报,1978,19(2):142~159.7 Chen Yong.Consistency of focal mechanism as a newparam-eter in describing seismic activity[J].Acta Geophysica Sini-ca,1978,19(2):142-159.(in Chinese)
8张宏志,刁桂苓,赵英萍,等.张北地区震前、震时和震后的震源机制[J].东北地震研究,2004,20(3):1~6.8 Zhang Hongzhi,Diao Guiling,Zhao Yingping,et al.The fo-cal mechanisms of earthquakes before and after Zhangbeimain event in the area[J].Seismological Research of North-east China,2004,20(3):1-6.(in Chinese)
9 James N and Clarence R.A micro-earthquake survey of theSan Andreas fault system in southern California[J].Bulletinof the Seismological Society of America,1967,57(2):277-296.
10 Aron J,Thomas K and Lewis A.Recent and long-term be-havior of the Brawley fault zone,Imperial Valley,Califor-nia:An escalation in slip rate?[J].Bulletin of the Seis-mological Society of America,2006,96(6):2 304-2 328.
11 Ambraseys N.The seismic activity of the Marmara sea re-gion over the last2000 years[J].Bulletin of the Seismolog-ical Society of America,2002,92(1):1-18.
12 Bingjun Zheng,Hamburger M W and Popandopulo G A.Precursory seismicity changes preceding moderate and largeearthquakes in the Garm region,Central Asia[J].Bulletinof the Seismological Society of America,1995,85(2):571-589.
13 Carlos M and Dewey J W.Seismicity associated with thegreat Colombia-Ecuador earthquakes of 1942,1958,and1979:Implications for barrier models of earthquake rupture[J].Bulletin of the Seismological Society of America,1984,74(2):577-593.
14 Serif B,Akihiko I,Balamir S,et al.Mroearthquake activitybefore the Izmit earthquake in the eastern Marmara region,Turkey(1 January1993-17 August1999)[J].Bulletin ofthe Seismological Society of America,2002,92(1):394-405.
2林纪曾,等.粤东、闽南沿海小震震源参数的测定研究[J].地震学报,1991,13(4):420~429.2 Lin Jizeng,et al.Determination of source parameters of smallearthquakes in the east part of Guangdong and south part ofFujian province[J].Acta Seismologica Sinica,1991,13(4):420-429.(in Chinese)
3胡新亮,等.利用数字地震记录的P-、S-振幅比资料测定小震震源机制的可靠性分析[J].地震地质,2004,26(2):347~354.3 Hu Xinliang,et al.Reliability analysis of focal mechanismsolutions of micro-earthquakes determined from amplitude ra-tio of-Pand-Srecorded by digital seismograph[J].Seismolo-gy and Geology,2004,26(2):347-354.(in Chinese)
4刁桂苓,于利民.震源机制解的系统聚类分析:以海城地震为例[J].中国地震,1992,8(3):86~92.4 Diao Guiling and Yu Limin.Hierarchical clustering analysisof the focal mechanism solution——taking the Haichengearthquake sequences for example[J].Earthquake Researchin China,1992,8(3):86-92.(in Chinese)
5鄢家全.中国及邻近地区现代构造应力场的区域特征[J].地震学报,1979,1(1):17~29.5 Yan Jiaquan.Some featunes of the recent tectonic stress fieldof the environs[J].Acta Seismologica Sinica,1979,1(1):9-24.(in Chinese)
6刁桂苓.震源机制[A].一九六六年邢台地震[C].北京:地震出版社,1986.6 Diao Guiling.Focal mechanism[A].Xingtai earthquake in1966[C].Beijing:Seismological Press,1986.(in Chinese)
7陈颙.用震源机制一致性作为描述地震活动性的新参数[J].地球物理学报,1978,19(2):142~159.7 Chen Yong.Consistency of focal mechanism as a newparam-eter in describing seismic activity[J].Acta Geophysica Sini-ca,1978,19(2):142-159.(in Chinese)
8张宏志,刁桂苓,赵英萍,等.张北地区震前、震时和震后的震源机制[J].东北地震研究,2004,20(3):1~6.8 Zhang Hongzhi,Diao Guiling,Zhao Yingping,et al.The fo-cal mechanisms of earthquakes before and after Zhangbeimain event in the area[J].Seismological Research of North-east China,2004,20(3):1-6.(in Chinese)
9 James N and Clarence R.A micro-earthquake survey of theSan Andreas fault system in southern California[J].Bulletinof the Seismological Society of America,1967,57(2):277-296.
10 Aron J,Thomas K and Lewis A.Recent and long-term be-havior of the Brawley fault zone,Imperial Valley,Califor-nia:An escalation in slip rate?[J].Bulletin of the Seis-mological Society of America,2006,96(6):2 304-2 328.
11 Ambraseys N.The seismic activity of the Marmara sea re-gion over the last2000 years[J].Bulletin of the Seismolog-ical Society of America,2002,92(1):1-18.
12 Bingjun Zheng,Hamburger M W and Popandopulo G A.Precursory seismicity changes preceding moderate and largeearthquakes in the Garm region,Central Asia[J].Bulletinof the Seismological Society of America,1995,85(2):571-589.
13 Carlos M and Dewey J W.Seismicity associated with thegreat Colombia-Ecuador earthquakes of 1942,1958,and1979:Implications for barrier models of earthquake rupture[J].Bulletin of the Seismological Society of America,1984,74(2):577-593.
14 Serif B,Akihiko I,Balamir S,et al.Mroearthquake activitybefore the Izmit earthquake in the eastern Marmara region,Turkey(1 January1993-17 August1999)[J].Bulletin ofthe Seismological Society of America,2002,92(1):394-405.
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