呼和浩特-包头地区平均波速比研究
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摘要
内蒙古呼和浩特-包头地区地质构造复杂,历史上曾发生多次6级以上强地震。本文选取该地区做为研究对象,根据2001年1月1日～2010年4月30日ML≥1.0地震的空间分布和研究区域的台网布局,划分出2个子区域,每个子区域控制在3°×2°的空间范围内,分别计算了各个子区域的平均波速比,并对比分析其时间和空间变化。计算结果表明,各个子区域的平均波速比曲线随时间而变化的幅度相差不大,基本维持在2.5%～2.584%之间;呼和浩特地区的平均波速比为1.722,明显低于包头地区的平均波速比1.733,初步推断与呼和浩特地区的断裂构造分布及地下介质性质有关。
The Hohhot-Baotou area has the complex geological structure and several earthquakes with MS≥6.0 ever occurred in history.This article divides the Hohhot-Baotou area into 2 sub-regions on the basis of ML ≥1.0 earthquakes' space distribution during January 2001 to April 2010 and deployment of the station network,and each sub-region is limited within a space of 3° × 2°.The average velocity ratio of each sub-region is calculated,and compared with its variations of time and space.The results show that there is no significant variation of the average velocity curve in each sub-region against time flow:the difference remains between 2.5%～2.584%.The average velocity ratio of Hohhot is 1.722,significantly lower than that of Baotou region,which is 1.733.It can therefore be inferred that the phenomenon is related to the fault distribution and the underground media of the region of Hohhot.
The Hohhot-Baotou area has the complex geological structure and several earthquakes with MS≥6.0 ever occurred in history.This article divides the Hohhot-Baotou area into 2 sub-regions on the basis of ML ≥1.0 earthquakes' space distribution during January 2001 to April 2010 and deployment of the station network,and each sub-region is limited within a space of 3° × 2°.The average velocity ratio of each sub-region is calculated,and compared with its variations of time and space.The results show that there is no significant variation of the average velocity curve in each sub-region against time flow:the difference remains between 2.5%～2.584%.The average velocity ratio of Hohhot is 1.722,significantly lower than that of Baotou region,which is 1.733.It can therefore be inferred that the phenomenon is related to the fault distribution and the underground media of the region of Hohhot.
引文
[1]栗生平、傅征祥,2005,华北地区地震带分段波速比平均值的测定,见:国家地震局科技发展司,中国大陆2005年前强震危险性预测研究。
[2]杨世英等,2008,震相数据转换软件。
蔡静观,2000,波速比计算中的不确定因素和在地震预报中的应用,地震研究,23(1),51～56。
蔡静观、梅世蓉、张喜铃等,1999,从高波速比试论云南丽江7级地震的孕震模式,地震研究,22(2),122～129。
冯德益,1981,地震波速异常,186～200,北京:地震出版社。
傅征祥、程燕,1988,北京和张家口地区地壳平均波速比的联合测定,地震,(4),28～34。
国家地震局预测预防司,1997,测震学分析预报方法,北京:地震出版社。
嘉世旭、刘昌铨,1996,邢台震源区波速比异常与地震的关系,地震学报,39(supp),205～215。
黎明晓、张晓东,2004,应用多台法测定华北地区地壳的平均波速比,地震,24(1),163～169。
李永莉、毛慧玲、赵小艳等,2008,云南地区数字地震波波速比的区域特征,地震研究,31(3),203～208。
岳晓媛、王林瑛、武安绪,2008,北京地区地震波速比异常变化与首都圈中等地震的关系研究,地震地磁观测与研究,29(3),10～13。
张学民、刁桂苓、柬沛镒等,2004,华北地区地下介质波速比值(vP/vS)研究,地震地质,26(2),305～317。
[2]杨世英等,2008,震相数据转换软件。
蔡静观,2000,波速比计算中的不确定因素和在地震预报中的应用,地震研究,23(1),51～56。
蔡静观、梅世蓉、张喜铃等,1999,从高波速比试论云南丽江7级地震的孕震模式,地震研究,22(2),122～129。
冯德益,1981,地震波速异常,186～200,北京:地震出版社。
傅征祥、程燕,1988,北京和张家口地区地壳平均波速比的联合测定,地震,(4),28～34。
国家地震局预测预防司,1997,测震学分析预报方法,北京:地震出版社。
嘉世旭、刘昌铨,1996,邢台震源区波速比异常与地震的关系,地震学报,39(supp),205～215。
黎明晓、张晓东,2004,应用多台法测定华北地区地壳的平均波速比,地震,24(1),163～169。
李永莉、毛慧玲、赵小艳等,2008,云南地区数字地震波波速比的区域特征,地震研究,31(3),203～208。
岳晓媛、王林瑛、武安绪,2008,北京地区地震波速比异常变化与首都圈中等地震的关系研究,地震地磁观测与研究,29(3),10～13。
张学民、刁桂苓、柬沛镒等,2004,华北地区地下介质波速比值(vP/vS)研究,地震地质,26(2),305～317。
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