Analysis of aeromagnetic data in Tuen Mun and Lantau area

Abstract

A study of aeromagnetic data of Hong Kong, specifically in western Hong Kong, Tuen Mun area, Western Harbour and northern part of Lantau Island, has been carried out. This aeromagnetic study is inspired by the Ground Investigation project for the Tuen Mun-Chek Lap Kok Link of the Hong Kong-Zhuhai-Macao Bridge that I have involved in. The objective of the study is to reveal the geology of the study area by geophysical method, i.e. aeromagnetic study. The data was acquired from the Geotechnical Engineering Office in a report produced by Cosine Ltd in 2000, and was presented in the form of ASCII digital data. The data has been undergone a process called Euler Deconvolution to estimate the depth and location of causative magnetic sources. The processed data was presented in the form of clusters of sources overlaid on different kind of maps of Hong Kong. It is concluded that the clusters of causative magnetic sources show good correlation with the faults in Hong Kong and also the regional fault pattern. The clusters of deeper magnetic sources in the vicinity of NE Lantau may also indicate the new extent of crustal extension from the dyke swarms in Lantau.