基于GMT脚本的AMT数据曲线图批量绘制方法与应用研究

Batch plotting method and application research of AMT data curve based on GMT script

AMT法观测天然交变电磁场,通过数据处理和反演可获得地下介质的电性分布特征,近年来得到了广泛应用。AMT数据曲线图包括测点信息、视电阻率和阻抗相位曲线及数据,可直观反映测点数据质量和曲线类型,是重要的原始资料。加拿大Phoenix Geophysics公司的MTU-5A和V8大地电磁仪是国内最常见的AMT仪器,原始数据经预处理,用MT-Editor软件编辑后可以批量导出PLT格式文件,使用awk命令可从PLT文件中提取测点信息和视电阻率、阻抗相位数据,利用GMT绘图软件将测点信息和数据绘制成图,结合循环语句可达到批量成图的目的。AMT数据曲线图可应用于原始数据质量评价和AMT测深曲线类型判别,在工作区地电规律研究中具有重要意义。

The audio magnetotelluric method is widely used in recent years to observe the natural alternating electromagnetic field and obtain the electrical distribution characteristics of the underground medium through data processing and inversion.AMT data graph includes station information,apparent resistivity curve and impedance phase curve and data,which can directly reflect the data quality and curve type of measuring point,and is an important raw material.MTU-5A and V8 magnetotelluric instruments of Canadian Phoenix Geophysics Company are the most common AMT instruments in China.The original data can be preprocessed and edited with MT-Editor software to export PLT format files in batch.awk command can be used to extract measuring point information,apparent resistivity and impedance phase data from PLT files.GMT software can be used to draw station information and data into graphs,and batch mapping can be achieved in combination with cyclic statements.The AMT data graph can be applied to evaluate the quality of raw data and distinguish the type of AMT apparent resistivity curve,which is of great significance in the study of geoelectric laws in work areas.