About:

Over the last 30 years, there has been a revolutionary change in the resistivity (and IP) surveying method. Until the early 1990's, the resistivity method has been used as a one-dimensional (1D) tool where quantitative modelling was confined to simple horizontal layers which are not sufficiently accurate for complex geological environments. However due to recent developments in field equipment design, interpretation software and microcomputer technology, two-dimensional (2D) and three-dimensional (3D) surveys are now practical geophysical exploration tools for environmental, engineering and mineral exploration studies. A newer development is 4-D time-lapse surveys.

There has been an explosive growth in the number of commercial multi-electrode resistivity meter systems for electrical imaging surveys sold by companies in Europe, North America and Asia, particularly from China!. A set of free lecture notes (Tutorial Notes) which cover a number of practical aspects of 2D and 3D electrical imaging surveys, including field methodology and data interpretation, is available in the 'Downloads' page of this website.

The second development that has made 2D and 3D electrical imaging surveys practical tools is fast interpretation software that can be used on commonly available Windows based microcomputers.

Most commercial surveys are probably 2-D surveys surveys with the electrodes arranged along a line. Surveys are nomally carried out with the line on the ground surface, but they have also been conducted underwater and across boreholes. Many examples are shown in the free Tutorial Notes on the Downloads page.

3-D surveys are required in geologically complex areas where 2-D surveys suffer from artifacts due to structures outside the line. 3D surveys are more time-consuming and expensive to carry out, but are useful for very complex geological situations particularly in mineral exploration surveys in rugged and forested areas. New numerical techniques have been developed to enable the inversion of data sets with more than a million measurements using models with millions of cells. The data processing can be done using convential PCs. Several 3-D and 4-D survey examples are also shown in the Tutorial Notes.

Dr. M.H.Loke obtained a P.hD. from the School of Earth Sciences, The University of Birmingham in 1994 under the supervision of Dr. R.D.Barker. His present research interests are in fast 2D and 3D inversion methods for geoelectrical data, optimisation of electrode arrays for 2D and 3D surveys, time-lapse inversion techniques, fast numerical methods and applications of parallel programming techniques in geophysical modelling and the use of global optimisation methods in 2-D resistivity inversion. He is a member of the editorial board of the Journal of Applied Geophysics. He received the SEG-EEGS Frank Frischknecht Leadership Award in March 2019 at the SAGEEP conference in Portland, Oregon, USA. For a more detailed biography, including a list of publications, please download the following pdf file. M.H Loke Biography

 

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History and Family

Zero longitude, London, 2000

Almost zero latitude, Singapore, 2002

 

Manly, Down Under, 2003

Prehistoric Forest, WA, 2006

Company Guard Dog, Penang, 2009

A home away from home. Kardinya, WA, 2013 (M.H.Loke,Naoko,Tania,Thaddeus,Thomas,Y.Gan)

Transylvania, 2019

SAGEEP 2019, SEG-EEGS Frank Frischknecht Leadership Award. The second Asian to win this scientific award after a Japanese in 2013, and so far the only one from South East Asia!

EEGS, FastTimes 2019, 24(1)

Some Workshops

Connecticut, 2001

Bangkok, 2004

Saskatoon, 2007

Yogyakarta, 2018

Kuala Lumpur, 2019