#TITLE_ALTERNATIVE#

• Main Author: Dina Anggreni Sarsito (NIM : 223 93 001)
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7646
• Institution: Institut Teknologi Bandung

Abstract: <br /> <br /> <br /> <br /> An improved Levenburg-Marquardt technique have been developed in this research to rapidly invert Bouguer gravity data for a 3-D density distribution as a source of the observed field. This technique is designed to replace tedious forward modeling with an automatic solver that determines density models constrained by geologic information. Where such information is not available, objective models are generated. The technique estimates the density distribution within the source volume using a least-squares inverse solution that is obtained iteratively by generalized matrix inversion - singular value decomposition. The source volume is subdivided into a series of right rectangular prisms of specified size but of unknown density. This discretization allows the construction of a system of linear equations relating the observed gravity field to the unknown density distribution. <br /> <br /> <br /> <br /> Convergence of the solution to the system is tightly controlled by a damping parameter which may be varied at each iteration. The associated algorithm generates statistical measures of solution quality not available with most forward methods. Along with the ability to handle data sets within reasonable time constraints, the advantages of this approach are : the easy with which pre-existing geological information can be included to constrain the solution, its minimization of subjective input, the avoidance of difficulties encountered during wave number domain transformations and the objective nature of the solution. <br /> <br /> <br /> <br /> Application to synthetic gravity data sets model has yielded a geologically and geophysically reasonable (almost same with the given synthetic sources).