长白山天池火山气体地球化学监测及数据处理方法探讨

The Geochemical Monitoring of Volcanic Gases in the Tianchi Area of the Changbaishan Mountains and Discussion of Their Data Processing Methods

气体地球化学监测是火山活动最直接、最有效的监测手段之一。在对长白山天池火山近二十年的气体地球化学观测数据进行整理的基础上,对其综合质量及数据处理方法进行了评价。结果表明,与传统的地震前兆观测数据相比,气体地球化学观测数据的格式具有特殊性和不连续性,可应用R语言或者其它程序设计语言对观测数据进行整理绘图,从而分析观测数据的变化情况。温泉逸出气体组分CH4的观测数据序列在时间域中基本呈正态分布,可作为判别气体异常变化的重要指标。温泉逸出气体中的CO2与N2、O2呈线性相关,可重点分析CO2、He、H2、CH4、泉水温度等,从而优化分析指标,提高分析效率。

The Gas geochemical monitoring is one of the most important measures for directly and effectively monitoring volcanic activities.. On the basis of assembly and compilation of data for the geochemical monitoring volcanic gases in the Tianchi area of the Changbaishan Mountains,an assessment on the quality and processing methods of the data has been comprehensively carried out in this paper. The results show that the format of gas geochemical data has particularity and discontinuity comparing to the traditional earthquake precursory measured data. The R language or other programming languages can be used to deal with the measured data for drawing curves and then for further analyzing variation of the measured data. The measured data series of CH4,effused from thermal springs,generally show a normal distribution in time domain. It can be recognized as an important indicator for judging the anomalous change of gases. The compositions of regular gases including CO2,N2,and O2,effused from thermal springs,have clear linear relationships. Thus,the analysis of CO2,He,H2,and CH4 compositions and measurement of hot spring temperatures should be mainly carried out in order to optimize analytical indicators and to improve analytical efficiency.