山西地震带中小震精确位置及其显示的山西地震构造特征
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摘要
利用山西1981—2001年模拟观测台网和2002—2008年间数字地震台网的震相数据,采用绝对定位方法和双差相对地震定位方法对山西及其周边地区中小地震进行了精确重新定位.结果表明:(1)重新精确定位后,震中水平误差≤5km的地震由原来65.8%提高到86.2%;7498次原始无震源深度的地震取得了深度结果.(2)精确定位后震中分布格局与原始结果相比变化不大,绝大多数地震集中在中部断陷盆地带内,两侧隆起区则相对较少,与山西地质构造的区域性和成带性相吻合;震源深度北浅南深,存在由北向南逐渐加深的特点.(3)重定位结果可以大致勾勒出各构造盆地发震层下界,较清晰地分辨出断陷盆地、盆间隆起的位置.(4)地震深度分布与盆山构造形态有较好的相关性.
Based on the phase reports of analog seismic stations from 1981—2001,and those of digital seismographs from 2002—2008,we relocated the small to moderate earthquakes with unprecedented precision by absolute and relative relocating methods.Results show that:(1) comparing with precious researches,the percentage of relocated earthquakes with horizontal locating error ≤5 km increases from 65.8% to 86.2%,and 7498 earthquakes which were not located previously are located in this work;(2) The general pattern of seismicity has no big changes in horizontal directions.Most earthquakes occurred in the central rift belt,with a few earthquakes located at the two sides of the Fenhe-Weihe Rift.While in vertical direction,the relocated earthquakes have an obvious trend that the earthquake depths increase from north to south part of the Fenhe Rift.(3) The distribution of relocated earthquakes can outline the profile of the lower seismogenic boundaries of the basins,as well as the boundaries between the extensional basins and the uplifted areas.(4) There is a good correlation between the focal depths and the structures of the basin and range system.
Based on the phase reports of analog seismic stations from 1981—2001,and those of digital seismographs from 2002—2008,we relocated the small to moderate earthquakes with unprecedented precision by absolute and relative relocating methods.Results show that:(1) comparing with precious researches,the percentage of relocated earthquakes with horizontal locating error ≤5 km increases from 65.8% to 86.2%,and 7498 earthquakes which were not located previously are located in this work;(2) The general pattern of seismicity has no big changes in horizontal directions.Most earthquakes occurred in the central rift belt,with a few earthquakes located at the two sides of the Fenhe-Weihe Rift.While in vertical direction,the relocated earthquakes have an obvious trend that the earthquake depths increase from north to south part of the Fenhe Rift.(3) The distribution of relocated earthquakes can outline the profile of the lower seismogenic boundaries of the basins,as well as the boundaries between the extensional basins and the uplifted areas.(4) There is a good correlation between the focal depths and the structures of the basin and range system.
引文
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[10]黄嫒,杨建思,张天中.2003年新疆巴楚—伽师地震序列的双差法重新定位研究.地球物理学报,2006,49(1):162-169.Huang Y,Yang J S,Zhang T Z.Relocation of the Bachu-Jiashi,Xinjiang earthquake sequence in 2003 using thedouble-difference location algorithm.Chinese J.Geophys.(in Chinese),2006,49(1):162-169.
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[19]于利民,刁桂苓,李钦祖等.由深源远震体波记录反演华北北部地壳上地幔速度结构.华北地震科学,1995,13(3):11-20.Yu L M,Diao G L,Li Q Z,et al.Inverse of velocitystructure of upper mantle of crust in northern part of northChina by body wave recordings of deep focus distantearthquakes.Earthquake Science of North China(inChinese),1995,13(3):11-20.
[20]张学民,刁桂苓,束沛镒.鄂尔多斯块体及其东南缘剪切波速度结构与波速比研究.中国地震,2004,20(1):53-63.Zhang X M,Diao G L,Shu P Y.Study on shear wavevelocity structure and velocity ratio under the Ordos plate andits southeastern marginal areas.Earthquake Research inChina(in Chinese),2004,20(1):53-63.
[21]徐扬,田勇,啜永清等.大同-阳高6.1级震群震源区及其附近地区地壳三维P波速度结构反演.山西地震,1997,(Z1):24-29.Xu Y,Tian Y,Chuo Y Q,et al.Inversion of 3dimensionalP wave velocity structure of curst in focal region and itsnearby region of Datong Yanggao M6.1earthquake.EarthquakeResearch in Shanxi(in Chinese),1997,(Z1):24-29.
[22]Klein F W.User's Guide to HYPOINVERSE-2000,aFortran Program to Solve for earthquake Locations andMagnitudes.U.S.Geological Survey Open-File Report,2007.
[23]Waldhauser F,Ellsworth W L.A double-differenceearthquake location algorithm:Method and application to thenorthern Hayward fault,california.Bull.Seismol.Soc.Am.,2000,90(6):1353-1368.
[24]李善邦.中国地震.北京:地震出版社,1981:120-121.Li S B.Earthquake Research in China(in Chinese).Beijing:Seismological Press,1981:120-121.
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[26]Laske G,Masters G.A global digital map of sedimentthickness.EOS Trans.AGU,1997,78:F483.
[27]Murphy J R,Barker B W.Improved focal-depth determinationthrough automated identification of the seismic depth phases pPand sP.Bull.Seismol.Soc.Am.,2006,96(4A):1213-1229.
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