福建地区地震震源深度特征的统计分析
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摘要
根据福建数字地震台网记录的地震震源深度资料,统计分析了1998年7月至2008年6月期间福建及邻区ML≥1.0并有震源深度参数且观测精度为1类地震1 431次。采用0.4°×0.4°网格和以0.2°为滑动步长,统计了网格内地震的平均深度,并绘制了平均深度等值线图。分析结果表明:①福建地区地震震源深度总体上呈现东南深、西北浅的特征,东南沿海地区平均震源深度大于14 km,西北地区平均震源深度小于10 km;②平均震源深度等值线展布大致呈NE向,在福建南部地区平均震源深度在沿NE向展布基础上,还受到NW向断裂控制,断裂构造通过的地区平均震源深度相对较深;③福建地区地震动力成因与中国大陆其他地区有所不同。
Based on focal depth data of Fujian digital seismic network,we analyzed 1431 ML≥1.0 earthquakes with focal depth and first class observation accuracy occurred in Fujian province and vicinities from July 1998 to June 2008.With the meshes of 0.4°×0.4°and the sliding step of 0.2°,the average focal depth in every mesh was calculated,and contour map of average focal depth was plotted.The results can be summarized as follows: ① The characteristics of focal depths in the region is deeper in the southeast than in the northwest.The average focal depth is more than 14 km in the southeast costal region and less than 10 km in the northwestern region(Nanpin City area);② The isolines are mainly in NE direction.The focal depth is controlled by NW-trending structure and relatively deep in fault structure areas in the southern;③ The earthquake dynamic cause in Fujian region may be different from the other parts of the China continent.
Based on focal depth data of Fujian digital seismic network,we analyzed 1431 ML≥1.0 earthquakes with focal depth and first class observation accuracy occurred in Fujian province and vicinities from July 1998 to June 2008.With the meshes of 0.4°×0.4°and the sliding step of 0.2°,the average focal depth in every mesh was calculated,and contour map of average focal depth was plotted.The results can be summarized as follows: ① The characteristics of focal depths in the region is deeper in the southeast than in the northwest.The average focal depth is more than 14 km in the southeast costal region and less than 10 km in the northwestern region(Nanpin City area);② The isolines are mainly in NE direction.The focal depth is controlled by NW-trending structure and relatively deep in fault structure areas in the southern;③ The earthquake dynamic cause in Fujian region may be different from the other parts of the China continent.
引文
[1]福建省地方志编撰委员会.福建省地震志[M].北京:中国社会科学出版社,2001.
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[9]李祖宁,刘序俨,吴绍祖,等.台湾海峡两岸地壳相对运动分析[J].大地测量与地球动力学,2007,27(5):18-21.
[10]史粦华,周峥嵘,鲍挺,等.福建及沿海地区地震活动力源探讨[J].地震,2006,26(4):104-112.
[2]张国民,汪素云,李丽,等.中国大陆地震震源深度及其构造含义[J].科学通报,2002,47(9):663-670.
[3]王健,张雷.中小地震深度分布特征与中长期前兆机理分析[J].中国地震,2001,17(3):299-304.
[4]汪素云.中国大陆地震震源深度分布特征的初步研究[J].地震研究,1996,19(3):310-315.
[5]胥广银,高孟潭,俞言祥,等.地震震源深度分布模型的统计研究[J].中国地震,2001,17(4):342-348.
[6]赵仲和.多重模型地震定位程序及其在北京台网的应用[J].地震学报,1983,5(3):242-254.
[7]福建省地震局.福建省地震监测志[M].北京:地震出版社,2005.
[8]陈祥熊,林树,李祖宁,等.福建—台湾地区一维地壳速度结构的初始模型[J].地震,2005,25(2):61-68.
[9]李祖宁,刘序俨,吴绍祖,等.台湾海峡两岸地壳相对运动分析[J].大地测量与地球动力学,2007,27(5):18-21.
[10]史粦华,周峥嵘,鲍挺,等.福建及沿海地区地震活动力源探讨[J].地震,2006,26(4):104-112.
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