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地震 ›› 2010, Vol. 30 ›› Issue (1): 82-89.

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福建地区地震震源深度特征的统计分析

林松建, 陈为伟, 郑师春   

  1. 福建省地震局, 福建 福州 350003
  • 收稿日期:2009-04-20 修回日期:2009-06-18 出版日期:2010-01-31 发布日期:2021-10-15
  • 作者简介:林松建(1964-), 男, 福建闽侯人, 高级工程师, 主要从事地震活动性分析和地震危险性评估以及工程地震等研究。

Statistical Analysis of Earthquake Depth Distribution in Fujian Region

LIN Song-jian, CHEN wei-wai, ZHENG Shi-chun   

  1. Earthquake Administration of Fujian Province, Fuzhou 350003, China
  • Received:2009-04-20 Revised:2009-06-18 Online:2010-01-31 Published:2021-10-15

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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1431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。

关键词: 震源深度特征, 统计分析, 地震构造, 福建地区

Abstract: 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.

Key words: Focal depth Distribution, Statistical Analysis, Seismic structure, Fujian Region

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