On the quality of marine magnetic anomaly sources and sea-floor topography

Schouten, Hans; Denham, Chuck; Smith, Woollcott

doi:10.1111/j.1365-246x.1982.tb06403.x

Cited by 20 publications

(8 citation statements)

References 19 publications

(31 reference statements)

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“…No effort has been made in this study to investigate the relationship of their spectra to the spreading rate, because the bathymetry profiles used are too short to generate reliable estimates of the thermal subsidence trend, thus making it impossible to extract these small features from the ridge axial topography. These topographic features appear to be created by faulting at the inner walls of the rift valley and to be subsequently transported away from the spreading axis (Macdonald & Atwater, 1978;Francis, 1981;Schouten et al, 1982;Malinverno & Gilbert, 1989). Studies have shown that the root-mean-square amplitude roughness of small-scale features, defined as the square root of the average deviation of the depths from those predicted by the age-depth relationship, is proportional to the spreading rate (Hayes & Kane, 1991) or to the square root of the spreading rate (Malinvero, 1991).…”

Section: Resultsmentioning

confidence: 98%

Spreading rate dependence of the axial topography and gravity of the Mid‐Atlantic ridge between 22°N and 38°N

Rabinowitz

1996

Marine Geodesy

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Section: Resultsmentioning

confidence: 98%

Spreading rate dependence of the axial topography and gravity of the Mid‐Atlantic ridge between 22°N and 38°N

Rabinowitz

1996

Marine Geodesy

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“…The resolution of magnetic anomalies depends on a number of factors related to anomalies and their sources on the one hand (Schouten et al, 1982) and on the conditions of observation and magnetic anom aly registration, under which different technical and methodical errors are introduced, on the other hand (Barrett, 1968;Akker et al, 1970).…”

Section: Resolvability Of Marine Magnetic Anomalies Estimated By Tradmentioning

confidence: 99%

“…Schouten et al (1982) quantitatively estimated the resolvability of marine magnetic anomalies based on the source stochastic model. They considered a com plex magnetic layer formation model, according to which basalts erupt stochastically in time and space.…”

Section: Resolvability Of Marine Magnetic Anomalies Estimated By Tradmentioning

confidence: 99%

“…Theoretical power spectrum of magnetic anomalies in the magnetic layer stochastic model proposed in(Schouten et al, 1982): a signal (the averaged spectral power of the model) (1) and noise (Spectral analysis of the observed AV800610 magnetic profile and its portion with TW anomalies (colored gray). (a) The entire profile, (b) the power spectrum of AMF shown in (a) and (c), (c) the profile portion, and (d) the spectrum approximation by a broken line: the anomalous field (1), the spectrum (2), the piecewise linear approximation (3), and spectral regions corre sponding to different sources (4).…”

mentioning

confidence: 99%

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The possibilities of paleomagnetic and geohistorical analyses of “tiny wiggles” short-period marine magnetic anomalies

Иванов

Merkuryev

2016

Geomagn. Aeron.

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Marine magnetic anomalies of the tiny wiggles (TW) type can be used to solve geohistorical and paleomagnetic problems. The model fields corresponding to Paleocene-Eocene anomalies in the northwest ern Indian Ocean, which were formed during the fast spreading stage, were studied. For these fields, widely used interpretation methods were compared with a method proposed previously by the authors. The testing was performed with first the classical block model and then more complex models reflecting actual processes of oceanic accretion and magnetic field variations in the past. It was shown that the proposed method has advantages for this problem; it gives an error close to the minimum possible error and can adequately be used in interpretations. Spectral and statistical methods are used to estimate the magnetic anomaly resolving power and to study some factors that can exert a distorting influence. In addition, model examples have been used to indicate how the TW determination accuracy is affected by diurnal variations in the main magnetic field (MMF) and by ancient magnetization vector determination errors.

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“…This varies in character from place to place; for instance, the slow spreading mid-Atlantic ridge is usually associated with relatively rough topography, whereas the fast spreading East Pacific rise and much of the slow spreading Reykjanes ridge are associated with more smooth topography. This secondarder topography has been elegantly explained by Schouten, Denham & Smith (1982), who show that a stochastic model of discrete random temporal and spatial normal faults close to the ridge crest can reproduce the main characteristics of seafloor morphology (Rea 1975;Macdonald & Luyendyk 1977;Laughton & Searle 1979;Atwater 1979) by an appropriate choice of parameters like mean density of normal faults, mean fault throw and mean fault block tilt.…”

Section: Introductionmentioning

confidence: 97%

An application of the response function technique to profiles of bathymetry and gravity in the Gulf of Aden

Tamsett

1984

Geophysical Journal International

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Summary. The relationship between bathymetry and gravity in the eastern, and the western Gulf of Aden, is analysed by computing response functions. The form of the response functions indicates that the short‐wavelength topography is isostatically compensated. The most appropriate mechanism of compensation is one in which the topography is not locally compensated, but regionally compensated by flexure of the lithosphere. Though the sets of profiles from the eastern and the western Gulf of Aden are separated by only 500–750 km, the observed response functions are very different. The lithosphere in the eastern Gulf of Aden can be modelled by an elastic plate 15 ± 3 km thick, whereas an elastic plate 3 ± 2km thick is probably an appropriate model for the lithosphere in the western Gulf of Aden. A different mechanism of isostasy (the Pratt) operates in the compensation of the long‐wavelength topography of the mid‐ocean ridge in the Gulf of Aden. A larger negative broad Bouguer gravity anomaly across the western Gulf of Aden than across the east, indicates that upper mantle temperatures increase from east to west. The long‐wavelength shallowing of the Gulf of Aden and increasing elevation of the adjacent continents from east to west are therefore probably mainly the result of thermal uplift. The subdued nature of the median valley and (consequently) other short‐wave‐length topography in the west, can be explained by hot, low viscosity, asthenosphere, and the inferred thin lithosphere in the west also suggests high temperature mantle. Finally, a magnetic anomaly superimposed on the axial anomaly, which is probably related to the depth of the Curie temperature, is more common in the western Gulf of Aden than in the east, and this is also consistent with upper mantle temperatures increasing to the west. There are a number of similarities between the mid‐ocean ridge in the western Gulf of Aden and the Reykjanes ridge. It is suggested that the western Gulf of Aden is anomalous because of its proximity to the Afar ‘hot spot’ in the same way that the Reykjanes ridge is often considered to be anomalous because of its proximity to the Iceland ‘hot spot'.

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On the quality of marine magnetic anomaly sources and sea-floor topography

Cited by 20 publications

References 19 publications

Spreading rate dependence of the axial topography and gravity of the Mid‐Atlantic ridge between 22°N and 38°N

Spreading rate dependence of the axial topography and gravity of the Mid‐Atlantic ridge between 22°N and 38°N

The possibilities of paleomagnetic and geohistorical analyses of “tiny wiggles” short-period marine magnetic anomalies

An application of the response function technique to profiles of bathymetry and gravity in the Gulf of Aden

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