福建顺昌地震的波形分析
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摘要
2007年3月13日,福建省顺昌县郑坊乡连续发生了4.7级和4.6级两次地震,这是福建数字台网建成以来记录到的省内最大地震。这两次地震为开展福建地区的地震研究提供了极其宝贵的第一手观测资料。本文就两次地震的记录波形进行了分析,试图从中提取更多信息。结果表明:①地震记录波形中观测到首波临界距离,并据此估算出的震区附近的地壳厚度约为40km;②这两次地震的S波最大振幅比存在明显差异;③波形中分析出了清晰的sPn深度震相,并据此估算出4.7级地震的震源深度为8.4km,与其它方法测定结果一致,为正确测定震源深度提供了依据。
On March 13, 2007, there were two earthquakes with M4.7 and M4.6 occurred in the Zhenfang village,Shunchang,Fujian. And the M4.7 earthquake is the maximal magnitude earthquake in the Fujian region since the Fujian Digital Seismologic Observation Network had been set up. It provides a precious information for people to research for the seismology.In this paper, wave-form of these earthquakes are analyzed and contrasted, in order to get more information from them. The result shows that: using a critical distance which Pn phase can be recorded, the crustal thickness in the region was about 40km; different stations has the differential ratio about the maximal S-wave amplitude between the earthquakes; using the data of seismologic observation networks around the region to calculate focal depth by sPn-phase,the result is about 8.4km which is consistent with the result calculated by other methods.
On March 13, 2007, there were two earthquakes with M4.7 and M4.6 occurred in the Zhenfang village,Shunchang,Fujian. And the M4.7 earthquake is the maximal magnitude earthquake in the Fujian region since the Fujian Digital Seismologic Observation Network had been set up. It provides a precious information for people to research for the seismology.In this paper, wave-form of these earthquakes are analyzed and contrasted, in order to get more information from them. The result shows that: using a critical distance which Pn phase can be recorded, the crustal thickness in the region was about 40km; different stations has the differential ratio about the maximal S-wave amplitude between the earthquakes; using the data of seismologic observation networks around the region to calculate focal depth by sPn-phase,the result is about 8.4km which is consistent with the result calculated by other methods.
引文
高原、周蕙兰、郑斯华等,1997,测定震源深度的意义的初步讨论,中国地震,13(4),321～329。
时振梁、张少泉、赵国荣等,1992,地震工作手册,33,北京:地震出版社。
洪星、杨贵、林仙坎等,2006,sPn震相的多台同时测定法,地震地磁观测与研究,27(3),77～80。
陈祥熊、林树、李祖宁等,2005,福建—台湾地区一维地壳速度结构的初始模型,地震,25(2),61～68。
廖其林、王振明、王屏路,1988,福州—泉州—汕头地震地壳的爆炸地震研究,地球物理学报,31(3),270～280。
Bakun,W.H.and Joyner W.B.,1984.TheMLscale in central California,Bull.Seismol.Soc.Am.,74,1872～1843.
Ma Shutian and Gail Atkinson M.,2006.Focal depths for small to moderate earthquakes(mN-2.8)in western quebec,southernontario,and northern NewYork,Bull.Seism.Soc.Am.,96(2),609～623.
Murphy J.R.and Barker B.W.,2006.Improved focal-depth determination through automated identification of the seismic depth phasespPand sP,Bull.Seism.Soc.Am.,96(4A),1213～1229.
Woodgold,C.R.D.,1999.Wide aperture beamforming of depth phases by timescale contraction,Bull.Seism.Soc.Am.89,165～177.
Yinshuang Ai,Qi-Fu Chen,Fei Zeng,et al.,2007.The crust and upper mantle structure beneath southeastern China,Earth andPlanetary Science Letters,260,549～563.
时振梁、张少泉、赵国荣等,1992,地震工作手册,33,北京:地震出版社。
洪星、杨贵、林仙坎等,2006,sPn震相的多台同时测定法,地震地磁观测与研究,27(3),77～80。
陈祥熊、林树、李祖宁等,2005,福建—台湾地区一维地壳速度结构的初始模型,地震,25(2),61～68。
廖其林、王振明、王屏路,1988,福州—泉州—汕头地震地壳的爆炸地震研究,地球物理学报,31(3),270～280。
Bakun,W.H.and Joyner W.B.,1984.TheMLscale in central California,Bull.Seismol.Soc.Am.,74,1872～1843.
Ma Shutian and Gail Atkinson M.,2006.Focal depths for small to moderate earthquakes(mN-2.8)in western quebec,southernontario,and northern NewYork,Bull.Seism.Soc.Am.,96(2),609～623.
Murphy J.R.and Barker B.W.,2006.Improved focal-depth determination through automated identification of the seismic depth phasespPand sP,Bull.Seism.Soc.Am.,96(4A),1213～1229.
Woodgold,C.R.D.,1999.Wide aperture beamforming of depth phases by timescale contraction,Bull.Seism.Soc.Am.89,165～177.
Yinshuang Ai,Qi-Fu Chen,Fei Zeng,et al.,2007.The crust and upper mantle structure beneath southeastern China,Earth andPlanetary Science Letters,260,549～563.
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