• 作者： 曾俊六; 楊潔豪; 廖嘉旭
• 作者服務機構： 國立中央大學電機系; 地球物理研究所
• 中文摘要： 藉定差數值技巧所發展的電算程式去計算MMR之嚮應，其嚮應乃以MMR異常之垂直分量及水平分量乃至總磁場異常之場向的假性剖面圖來表示之。根據此怯以模擬各種不同的地質模型如垂直和傾斜之斷層，半圓錐窪谷與含岩塊之地質構造等，並加以分析及解釋，其所得之假性剖面圖並與視電阻法假性剖面圖比較發現對表層為導電體時的地質構造MMR法的確勝過視電阻法。在MMR異常之垂直與水平方向的假性剖面圖可以看出斷層與假性剖面所呈現的極性形狀有密切的關係，而且地質構造之幾何圖形與分佈之導電對比對MMR異常之影響很大。
• 英文摘要： A numerical computer program based on the finite-difference technique is developed to computethe MMR (Magnetometric Resistivity) response. The MMR responses for different geological models, suchas vertical and dipping contacts, semicylindrical depression and dikes are presented by using the pseudo-sections of vertical and horizontal components of the MMR anomaly and also the field direction of thetotal magnetic field anomaly. From these pseudo-sections some features can be recognized and someinterpretation will be given. For comparison, the pseudo-sections of apparent resistivity for the samegeologic sections are also given. The results show that the MMR method can reduce the shortcomings ofthe resistivity method for mapping geologic structures beneath a conductive overburden. The pole-likefeatures showing in the pseudo-sections of vertical and horizontal components of the MMR anomaly cangive crucial clues to the exploration of geological structures, especially the vertically faulted structures.In this paper, the same conclusion as previous studies [6] is reached that factors influencing the MMRanomaly are geometry and the conductivity contrast from the numerical simulation.
• 中文關鍵字： MMR modelling; finite difference method; pseudo-sections
• 英文關鍵字： --