TY - JOUR

T1 - Using analytic signal to determine magnetization/density ratios of geological structures

AU - Doo, Wen Bin

AU - Hsu, Shu Kun

AU - Tsai, Ching Hui

AU - Huang, Yin Sheng

PY - 2009/10

Y1 - 2009/10

N2 - 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.

AB - 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.

KW - Magnetic anomalies: modelling and interpretation

KW - Marine magnetics and palaeomagnetics

KW - Rock and mineral magnetism

UR - http://www.scopus.com/inward/record.url?scp=70349991688&partnerID=8YFLogxK

U2 - 10.1111/j.1365-246X.2009.04297.x

DO - 10.1111/j.1365-246X.2009.04297.x

M3 - 期刊論文

AN - SCOPUS:70349991688

SN - 0956-540X

VL - 179

SP - 112

EP - 124

JO - Geophysical Journal International

JF - Geophysical Journal International

IS - 1

ER -