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华清4^#泉水溶气体百分含量合计的强震远场前兆特征 被引量:3

Far-field Precursor Characteristics of Total Percentage Content of Water-dissolved Gas in Huaqing No.4 Hotspring Spot before Strong Earthquakes
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摘要 华清4#泉水溶气体百分含量合计(QB)的取值范围为100±5。按4舍5入法取整数值,将其分为11个区段。以年为单位,统计QB落在每个区段内的频次。频率分布直方图显示,在QB取值区间内,分区段频率呈近似正态分布。将落入QB频率最高的区段称为轴,将轴在不同区段上位置的变化称为轴漂。研究表明,QB在不同区段上轴的漂移,反映了区域应力场的不同状态。轴落入99区段上,反映的是区域应力场的增强,与远场M≥7.0地震及伴生中强地震、鄂尔多斯块体周边后继中强地震有很好的相关性;轴落入98区段上,反映的是区域应力场的相对稳定;轴落入97区段上,反映的是巨大地震后,区域应力场的调整及中强地震活动格局的变化。文中还阐述了99区段轴值与地震对应关系的几个特征。 Total percentage content of water-dissolved gas ( QB ) in Huaqing, Lintong, No. 4 hotspring spot ranges from 95 to 105. We divided QB into 11 sections after rounded it to integer, and took year as unit to do a frequency statistics of QB falling into each section. Based on frequency statistical histogram, the shape of frequency is close to normal distribution in each QB section. The section where the maximum QB is located is named as axis, and the change of the axis in different section is called as axis drift. The drift of QB axis in each section indicates different status of regional stress field. When the axis lies in section 99, it indicates the strengthening of regional stress field and a good correlation with M≥7.0 earthquakes in far field, a series of associated moderate earthquakes and subsequent moderate earthquakes around the Erdos block; when the axis lies in section 98, it indicates the relative stability of regional stress field; when in section 97, it indicates the adjustment of regional stress field and the change of moderate earthquake pattern after a great earthquake. We also discussed the relationship between earthquakes and the value of axis in section 99.
出处 《地震研究》 CSCD 北大核心 2006年第3期234-238,共5页 Journal of Seismological Research
基金 中国地震局"三结合"课题资助.
关键词 华清4^#泉 水溶气体百分含量合计 区段频率 轴值 区域应力场 强震远场前兆 Huaqing No. 4 hotspring total percentage content of water-dissolved gas frequency in eachsection value at axis regional stress field far-field precursor of strong earthquake
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