By analysing potential field data in the wavelet domain and performing a multi scale edge detection we can automate what in geologic jargon is commonly called 'worm analysis', i.e., the traditional visual inspection of gravity and aeromagnetic data in order to detect shallow faults, lineaments, contacts etc. More importantly, with the use of an appropriate wavelet, defined by the physics of the...

Abstract Globally, the largest geothermal resources are linked to crystalline basement, which could be exploited using Enhanced Geothermal Systems (EGS). The planned underground laboratory GeoLaB aims facilitate large-scale application of EGS technologies by performing in-situ high-flowrate experiments on fault zones. Tromm Granite at northwestern margin Upper Rhine Graben was preselected as on...

i Preface iii Summary v Introduction 1 Measurement techniques employed 3 Ground 3 Airborne 3 Magnetometer survey 4 Results 4 Ground control study 4 VLF survey 8 Bedrock geology and resistivity 8 Aeromagnetic survey results 13 Conclusions 13 Literature cited 13 Appendix A. Theory of electromagnetic resistivity si rveying 15 Appendix B. Magnetic surveying 19

Basin-and-range geothermal resources are typically fault-controlled, deep-circulation systems. They commonly occur beneath thick sequences of Tertiary and Quaternary basin-fill sediments which hinder understanding of fault geometries and faulting patterns. Recent experience at Dixie Valley and survey of the literature for other systems suggest a low-cost and rapid exploration strategy for estab...

INTRODUCTION A high-resolution aeromagnetic survey collected over the North Slope of Alaska by World Geoscience was acquired in response to a need for highly detailed data in an areawhere traditional geophysical techniques are expensive and prohibitive (McConnell, 1995) (Figure 1). These data were recently released to the University of Texas’ Institute for Geophysics and provide a unique opport...