3D joint seismic waveform and airborne gravity gradiometry inversion with cross-gradients constraints

2017 ◽  
Author(s):  
Wenbin Jiang ◽  
Jie Zhang ◽  
Weizhong Wang ◽  
Dengguo Zhou ◽  
Ahmad Riza Ghazali
Keyword(s):  
Airborne Gravity ◽  
Gravity Gradiometry ◽  
Seismic Waveform ◽  
Airborne Gravity Gradiometry

scholarly journals Interpretation of airborne gravity gradiometry and magnetic data using cross-gradients

2012 ◽  
Vol 2012 (1) ◽  
pp. 1-4
Author(s):  
Carlos Cevallos ◽  
Mark Dransfield ◽  
Jacqueline Hope ◽  
Heather Carey
Keyword(s):  
Magnetic Data ◽  
Airborne Gravity ◽  
Gravity Gradiometry ◽  
Airborne Gravity Gradiometry

Applying laterally varying density corrections to ground gravity and airborne gravity gradiometry data: a case study from the Bathurst Mining Camp

2019 ◽  
Vol 56 (5) ◽  
pp. 493-503 ◽  
Author(s):  
Peter Tschirhart ◽  
William A. Morris ◽  
John Mims ◽  
Hernan Ugalde
Keyword(s):  
Variable Density ◽  
Airborne Gravity ◽  
Surface Sampling ◽  
Gravity Gradiometry ◽  
Near Surface ◽  
Surface Mass ◽  
Geological Interpretation ◽  
Density Correction ◽  
Bathurst Mining Camp ◽  
Airborne Gravity Gradiometry

The influence of topography on gravity and gravity gradiometry measurements is profound and should be minimized prior to geological interpretation. The standard way of minimizing these effects is through the computation of a terrain correction. Terrain corrections require two inputs: topography and density. Often, geology and topography are inextricably intertwined: topography is caused by a change in geology. In geologic environments where there is a structural and (or) stratigraphic control on the near-surface mass distribution, using a single density value in the corrections leads to removal of the topographic effect of rocks having the chosen density. Any remaining gravity signal that correlates with topography is providing geological information. If the objective is to produce a gravity map with minimal topographic signal, then a regionally variable density correction is a means of compensating for this effect. In this paper, we demonstrate how to apply a spatially variable density correction using ground gravity and airborne gravity gradiometry data for the geologically complex Bathurst Mining Camp, northern New Brunswick, Canada. Ground gravity and airborne full tensor gravity gradiometry measurements are subdivided into a series of domains on the basis of the underlying tectonostratigraphic group. Terrain and Bouguer corrections are calculated for each domain using representative density values obtained from drill core and surface sampling throughout the Bathurst Mining Camp. The output from the spatially variable density correction is then compared with previous maps. Overall, the differences are subtle, but the spatially variably density allows for isolated anomalies to be better resolved.

Sign in / Sign up

Export Citation Format

Share Document