Crustal analysis of maud rise from combined satellite and near-surface magnetic survey data

Kim, Hyung Rae; Frese, Ralph R. B. von; Golynsky, Alexander; Taylor, Patrick T.; Kim, Jeong Woo

doi:10.1186/bf03351851

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…Both plates are 70‐km thick, with a 7‐km‐thick oceanic crust of 3,000 kg/m 3 in density, and with an imposed constant viscosity weak zone (10 19 Pa s) between the overriding and subducting plates. To study the influence of an oceanic plateau on SI, we impose an oceanic plateau with variable thickness, width, and density on the subducting plate, which are obtained from geological and seismological studies (see Supporting Information , Bohnhoff & Makris, 2004; Bryan & Ernst, 2008; Charvis et al., 1995; Christensen & Shaw, 1970; Coffin & Eldholm, 1994; Davy et al., 2008; Den et al., 1969; Francis & Shor, 1966; Gettrust et al., 1980; Gohl & Uenzelmann‐Neben, 2001; Goslin et al., 1981; Hussong et al., 1979; Kerr, 2014; Kim et al., 2005; Miura et al., 2004; Operto & Charvis, 1995; Parsiegla et al., 2008; Recq et al., 1998; Sinha et al., 1981; Viso et al., 2005; Walther, 2003; White et al., 1999). The model is resolved with 801 × 251 grid points in the x and z directions.…”

Section: Numerical Model Setupmentioning

confidence: 99%

Subduction Polarity Reversal Triggered by Oceanic Plateau Accretion: Implications for Induced Subduction Initiation

Sun

Kaus

Yang

et al. 2021

Geophysical Research Letters

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Subduction polarity reversal, an induced subduction initiation (SI), may occur frequently in geological history as exemplified by the Solomon subduction zone. However, the mechanism and dynamics of polarity reversal remain poorly understood. Here, we use 2D thermomechanical numerical models to investigate the dynamics of subduction polarity reversal during oceanic plateau accretion. Model results show that larger and lighter oceanic plateaus favor subduction polarity reversal, which is manifested by the formation of the Solomon subduction zone after the large Ontong Java Plateau collided with the former Melanesian (Manus‐North Solomon‐Vitiaz) trench. We analyze the stress state during the transient SI process and find that rapid extension of the oceanic plateau is concomitant with subduction polarity reversal, thus questioning the use of extensional structures as geological criteria for spontaneous SI.

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Section: Numerical Model Setupmentioning

confidence: 99%

Subduction Polarity Reversal Triggered by Oceanic Plateau Accretion: Implications for Induced Subduction Initiation

Sun

Kaus

Yang

et al. 2021

Geophysical Research Letters

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“…These Slepian-based studies, however, were restricted to single-altitude grids of satellite-based observations. Joint inversion efforts to combine near-surface and satellite magnetic observations, on the other hand, have used spherical point dipole or prism models to study how the anomalies may transition from near-surface to satellite altitudes (e.g., von Frese et al 1999;Ravat et al 2002;Milligan et al 2004;Kim et al 2004Kim et al , 2005Kim et al , 2007. In the present study, spherical Slepian functions are developed for fitting both near-surface scalar and satellite vector observations over Australia to study the altitude behavior of the anomalies.…”

Section: Introductionmentioning

confidence: 99%

Utility of Slepian basis functions for modeling near-surface and satellite magnetic anomalies of the Australian lithosphere

Kim

Frese

2017

Earth Planets Space

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The utility of frequency-and space-limited spherical harmonic Slepian basis functions for magnetic anomaly modeling over restricted spherical patches of the Earth was investigated using combined near-surface scalar and CHAMP satellite vector observations from Australia and adjacent marine areas. In particular, Slepian spherical harmonic models up to degree 360 were studied for modeling anomaly features of 1° (~111 km) and longer over a 25°-radius cap centered on Australia. Relative to the roughly 130,000 coefficients required for global spherical harmonic modeling, less than 5% of this number of coefficients is sufficient for effective localized Slepian modeling. Slepian coefficients have maximum power over the spherical cap and may be exploited for estimating the magnetic anomaly vectors and gradients to all orders within the working precision of the observations. The Earth cap modeled by Slepian coefficients is also more efficient in accommodating local crustal constraints from drilling and other geological and geophysical studies for interpreting the associated magnetic anomaly data registered in spherical coordinates. In general, Slepian spherical harmonic modeling is well suited for combining spectrally diverse compilations of near-surface and satellite magnetic observations over any spatially restricted spherical cap of the Earth or other planetary body.

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“…. 사실 대 부분의 위성들은 자세조정(attitude control)을 위해 자력 측정값을 활용하였으며 (Kim et al, 2007) 이를 위해 자 력계를 탑재하였으나 높은 정밀도를 갖고 있지는 않았다 (Kim et al, 2007;Lee et al, 2008 Alsdorf et al, 1994;Ravat et al, 1995) (Kim et al, 2007;Goodge & Finn, 2010;Hinze et al, 2013;Idoko et al, 2019;Ferré et al, 2020 (Kim et al, 1999 (Alsdorf et al, 1994;Ravat et al,1995;Purucker et al, 1999;Kim et al, 2002;Kim et al, 2005b). 이 방법은 다양한 자료처리 프로세싱(data processing) 작업을 통해 제작되는 지각 이상성분 (Alsdorf et al, 1994;Ravat et al, 1995;Kim et al, 2002 (Ravat et al, 1995;Langel and Hinze, 1998 Total field anomaly map of C) ascending and D) descending passes with the residuals from (A) and (B), respectively.…”

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A Study of CHAMP Satellite Magnetic Anomalies in East Asia

Kim

2021

Econ. Environ. Geol.

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Satellite magnetic observations reflect the magnetic properties of deep crust about the depth of Curie isotherm that is a boundary where the magnetic nature of the rocks is disappeared, showing long wavelength anomalies that are not easily detected in near-surface data from airborne and shipborne surveys. For this reason, they are important not only in the analyses on such as plate reconstruction of tectonic boundaries and deep crustal structures, but in the studies of geothermal distribution in Antarctic and Greenland crust, related to global warming issue. It is a conventional method to compute the spherical harmonic coefficients from global coverage of satellite magnetic observations but it should be noted that inclusion of erroneous data from the equator and the poles where magnetic observations are highly disturbed might mislead the global model of the coefficients. Otherwise, the reduced anomaly model can be obtained with less corruption by choosing the area of interest with proper data processing to the area. In this study, I produced a satellite crustal magnetic anomaly map over East Asia (20° ~ 55°N, 108° ~ 150°E) centered on Korean Peninsula, from CHAMP satellite magnetic measurements about mean altitude of 280 km during the last year of the mission, and compared with the one from global crustal magnetic model (MF7). Also, a comparison was made with long wavelength anomalies from EMAG2 model compiled from all near-surface data over the globe.

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Crustal analysis of maud rise from combined satellite and near-surface magnetic survey data

Cited by 9 publications

References 55 publications

Subduction Polarity Reversal Triggered by Oceanic Plateau Accretion: Implications for Induced Subduction Initiation

Subduction Polarity Reversal Triggered by Oceanic Plateau Accretion: Implications for Induced Subduction Initiation

Utility of Slepian basis functions for modeling near-surface and satellite magnetic anomalies of the Australian lithosphere

A Study of CHAMP Satellite Magnetic Anomalies in East Asia

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