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呼和浩特—包头地区平均波速比研究
韩晓明,张帆
Author NameAffiliation
Han Xiaoming Earthquake Administration of Inner Mongolia Autonomous Region, Hohhot 010010 , China 
Zhang Fan Earthquake Administration of Inner Mongolia Autonomous Region, Hohhot 010010 , China 
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,在2001年1月1日~2010年4月30日时段内,根据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。
关键词:  呼和浩特—包头地区 平均波速比 时空分析
DOI:
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基金项目:
A Study on Average Velocity Ratios( VP/VS ) in the Hohhot-Baotou Area
Han Xiaoming,Zhang Fan
Abstract:
The geological structure is complex in the Hohhot-Baotou area. Several earthquakes with MS ≥ 6. 0 have occurred in the area in history. This article selected the Hohhot-Baotou area as the study region and divided it into 2 sub-regions, each with a spatial scope of 3° x 2°, according to the spatial distribution of ML ≥ 1.0 earthquakes occurring between January 2001 and April 2010, and the layout of the seismic network in the study region. Average velocity ratios of respective sub-regions were calculated, and comparative analysis was made on their temporal and spatial variations. Results show that there are slight differences between sub-regions in the variation amplitude of average velocity ratio curves over time, which mostly remains between 2.5% to 2. 584 %. In the Hohhot area, the average velocity ratio is 1. 722, significantly lower than the average velocity ratio of 1. 733 in the Baotou area. We preliminarily concluded that this was related to the distribution of fault structures and properties of underground media in the Hohhot area.
Key words:  Hohhot-Baotou area  Average velocity ratio ( VP/VS ) % Spatio-temporal analysis