Using analytic signal to determine magnetization/density ratios of geological structures

NCUIR > College of Earth Sciences > Graduate Institute of Geophysics > journal & Dissertation > Item 987654321/27577

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27577

Title:	Using analytic signal to determine magnetization/density ratios of geological structures
Authors:	Doo,WB;Hsu,SK;Tsai,CH;Huang,YS
Contributors:	地球物理研究所
Keywords:	GRAVITY;ANOMALIES;DENSITY;THEOREM
Date:	2009
Issue Date:	2010-06-29 18:41:12 (UTC+8)
Publisher:	中央大學
Abstract:	P>The Poisson theorem provides a simple relationship between the gravity and magnetic potentials, which is useful in interpreting joint data sets of gravity and magnetic data. Based on the simple Poisson theorem, magnetization/density ratio (MDR) can be estimated. However, potential field data is often ambiguous in datum level and multisources interference that may cause bias in interpretation. Here, we propose an improved Poisson theorem to estimate MDR by using analytic signals of gravity and magnetic data. The major advantage of using the analytic signal is that we can also determine the sources locations and boundaries supposing that we know the ambient magnetic parameters. Besides, we can also avoid the determination error from uncertain datum levels. We demonstrate the feasibility of the proposed method in 2-D and 3-D synthetic models. The proposed method is also applied to a profile across the offshore area of northern Taiwan. Comparing with the reflection seismic profile, our result can help identify the existence of a deep-seated igneous body beneath the area of Mienhuayu and Pengchiagu islands off northern Taiwan.
Relation:	GEOPHYSICAL JOURNAL INTERNATIONAL
Appears in Collections:	[Graduate Institute of Geophysics] journal & Dissertation

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