华清4~#泉水溶气体百分含量合计的强震远场前兆特征
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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(Q_B) in Huaqing, Lintong, No.4 hotspring spot ranges from 95 to 105. We divided Q_B into 11 sections after rounded it to integer, and took year as unit to do a frequency statistics of Q_B falling into each section. Based on frequency statistical histogram, the shape of frequency is close to normal distribution in each Q_B section. The section where the maximum Q_B is located is named as axis, and the change of the axis in different section is called as axis drift.The drift of Q_B 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.
Total percentage content of water-dissolved gas(Q_B) in Huaqing, Lintong, No.4 hotspring spot ranges from 95 to 105. We divided Q_B into 11 sections after rounded it to integer, and took year as unit to do a frequency statistics of Q_B falling into each section. Based on frequency statistical histogram, the shape of frequency is close to normal distribution in each Q_B section. The section where the maximum Q_B is located is named as axis, and the change of the axis in different section is called as axis drift.The drift of Q_B 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.
引文
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车用太,谷元珠,鱼金子,等.2002.昆仑山口西MS8.1地震前地下流体的远场异常及其意义[J].地震,22(4):106-113.
车用太,王基华,林元武,等.1998.张北—尚义地震前的地下流体异常及其跟踪预报[J].地震地质,20(2):99-104.
陈华静,王基华,林元武.1999.断层土壤气的观测与地震短临预报[J].地震,19(1):81-89.
杜建国,康春丽.2000.强地震前兆异常特征与深部流体作用探讨[J].地震,20(3):95-101.
国家地震局.1985.地震水文地球化学观测技术规范[M].北京:地震出版社.
高小其,许秋龙,王道,等.2002.地下流体中强震源兆、场兆和强震远兆特征及其物理成因[J].地震,22(3):81-87.
何崇君,王新,赵小茂,等.2005.临潼台氢气异常与地震对应关系研究[J].华北地震科学,23(3):37-40.
李献智,高旭.1993.中国大陆强震前兆时空分布的大尺度特征初探[J].地震,13(3):44-51.
李献智.1996.强震远场前兆异常在地震预报中的应用[J].地震,16(1):39-44.
曲同磊,张昭栋,靖继才,等.1993.氮氦比对地震的反映[J].地震,13(3):7-10.
孙青,李圣强,罗立强.2005.中国大陆科学钻探工程主孔地下流体特征及与地震活动的关系初步研究[J].地震,25(1):15-21.
杨立明,车时.2004.大震前后中强地震活动格局变化及其预测意义初步研究[J].西北地震学报,26(3):212-217.
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