CAJ | 학술논문

重力区域场与局部场的划分是重力资料解释中的重要步骤之一.在考察空间域和波数域划分重力区域场与局部场常用方法的基础上,提出了多环带中值滤波法.该方法以计算点为中心建立多个环带,计算出各个环带的中值和均方差,按照事先设定的条件进行筛选,将满足条件的环带中值作为该点的区域场值,从重力异常中减去区域场后得到局部场.理论模型与实际资料的处理结果表明,该方法适应性强,划分出的场畸变小,并且能够很好地保留异常之间的界限特征.
중력구역장여국부장적화분시중력자료해석중적중요보취지일.재고찰공간역화파수역화분중력구역장여국부장상용방법적기출상,제출료다배대중치려파법.해방법이계산점위중심건립다개배대,계산출각개배대적중치화균방차,안조사선설정적조건진행사선,장만족조건적배대중치작위해점적구역장치,종중력이상중감거구역장후득도국부장.이론모형여실제자료적처리결과표명,해방법괄응성강,화분출적장기변소,병차능구흔호지보류이상지간적계한특정.
The division of regional gravity field and local gravity field is one of the important steps in gravity data interpretation. On the basis of inspecting common methods in dividing regional gravity field and local gravity field by spatial domain and frequency domain, the authors propose multi-ring median filtering method. This method builds multiple rings using calculated point as the center, calculates the median and the mean variance of each ring, and process filter under presettable conditions to take the median which meet the condition of ring as the point of regional field value and get local field by removing regional field in gravity anomaly. The results of theoretical model and actual data show multi-ring median filtering method is adaptable, which carrying out smaller field distortion, and the method can well retain the boundary characteristics between anomalies.