Magnetic anomaly maps from 40°N to 83°N derived from MAGSAT satellite data

Coles, Richard; Haines, G. V.; Beek, G Jansen van; Nandi, Anuj; Walker, J. K.

doi:10.1029/gl009i004p00281

Cited by 37 publications

(27 citation statements)

References 3 publications

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“…The comparisons to be made here will be with the results of Langel et al [1982aLangel et al [ , 1982b for low latitudes, those of Coles et al [1982] and Taylor [1983] for north polar areas, and Bentley [ 1982, 1983] for the Antarctic. Whereas this paper computes a model only to n* = 29, it would appear that all but the sharpest satellite-observed features may be seen at this level and that many are also visible by n* = 24.…”

Section: Introductionmentioning

confidence: 99%

Small‐scale features in the Earth's magnetic field observed by Magsat

Cain¹,

Schmitz²,

Muth³

1984

J. Geophys. Res.

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A spherical harmonic expansion to degree and order 29 is derived using a selected magnetically quiet sample of Magsat data. Global maps representing the contribution due to terms of the expansion above n = 13 at 400 km altitude are compared with previously published residual anomaly maps and shown to be similar, even in polar regions. An expansion with such a high degree and order displays all but the sharpest features seen by the satellite and gives a more consistent picture of the high‐order field structure at a constant altitude than do component maps derived independently. The appendix is available with the entire article on microfiche. Order from American Geophysical Union, 2000 Florida Avenue, N.W., Washington, DC 20009. Document B83‐008; $2.50. Payment must accompany order.

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Section: Introductionmentioning

confidence: 99%

Small‐scale features in the Earth's magnetic field observed by Magsat

Cain¹,

Schmitz²,

Muth³

1984

J. Geophys. Res.

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“…11). The largest high gradient zones of the T-and Z-MAGSAT anomaly fields [Coles et al, 1982;Haines, 1985] and the zones of disturbances of the mantle gravity component that are also shown in this figure. These zones indicate the general strikes of the major faults systems and can be the evidence for deep origin of the large faults related to them.…”

Section: Along the Dss Profile 25 The Mantle Component Varies Betweenmentioning

confidence: 85%

Heterogeneous structure of the lithosphere in the Black Sea from a multidisciplinary analysis of geophysical fields

Rusakov

Pashkevich

Кутас

et al. 2017

Geofizicheskiy Zhurnal

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Magnetic, gravity, geothermal, seismic and tomographic data from the lithosphere were first jointly examined. A multidisciplinary interpretation has resulted in a new and consistent model for lithospheric density, magnetic, thermal and velocity heterogeneities. Faults of different orders for the crystalline crust have been mapped in details. Large deep fault zones were recognized. Among them is the most prominent Odessa-Sinop-Ordu (OSO) fault zone, which played a key role in the opening and development of the Black Sea Depression. A fundamental difference was revealed between the crustal and mantle structure and geophysical parameters of the Western Black Sea Basin (WBSB) and Eastern Black Sea Basin (EBSB). These dissimilarities are in the size of «non-granitic» crust, pattern and intensity of heat flow, topography of the lower boundary of the thermal lithosphere, mantle seismic velocity and structure of magnetic and residual gravity anomalies. Based on new information it was demonstrated that the WBSB and EBSB were diachronously formed on two large distinct continental blocks with independent post-rift development of the sub-basins. The rifting of the western sub-basin commenced earlier than that of the eastern one. The EBSB is characterized by younger thermal activity than the WBSB and consequently it was stabilized later. The Mid Black Sea High (MBSH) is not a single tectonic unit but is formed by two ridges of various crystalline crustal structure and age shifted relative to each other by the faults of the OSO zone.Key words: The Black Sea basins, magnetics, gravity, heat flow, fault tectonics, seismic tomography, lithosphere heterogeneity.Впервые проведен общий анализ магнитных, гравитационных, геотермических, сейсми-ческих и томографических данных о литосфере Черного моря. В результате комплексной интерпретации получена новая и согласованная модель плотностной, магнитной, термаль-ной и сейсмической неоднородностей литосферы. Построена подробная карта разломов консолидированной коры разных рангов. Выявлены зоны глубинных разломов. Среди них наиболее примечательна зона разлома Одесса-Синоп-Орду, игравшая ключевую роль в рас-крытии и развитии Черноморской впадины. Выявлены фундаментальніе различия в строе-нии и геофизических параметрах коры и литосферы Западно-и Восточно-Черноморской впадин. Эти различия заключаются в размере площади «безгранитной» коры, структуре и интенсивности теплового потока, топографии нижней границы термальной литосферы, осо-бенностях магнитного и остаточного гравитационного полей. На основе новой информации показано, что Западно-и Восточно-Черноморская впадины сформировались в разное время на двух различных крупных блоках континентальной коры с независимым пострифтовым развитием суббассейнов. Рифт в западном бассейне образовался раньше, чем в восточном. Восточно-Черноморская впадина отличается более молодой термической активностью, чем Западно-Черноморская, которая стабилизировалась позже. Центрально-Черноморское под-нятие не представляет собой единую тектоническую единицу, а сформиро...

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“…The minimum is clearly seen on the Magsat anomaly map of the total field on the northern hemisphere down to 40"N (Coles et al 1982); it has later been characterized by Hahn & Wonik (1990) as a 'deficit' of average crustal magnetization amounting to 0.8-1.2 A m-' that is embedded into the East European Platform (EEP).…”

Section: Introductionmentioning

confidence: 97%

A model of the distribution of crustal magnetization in central Europe compatible with the field of magnetic anomalies deduced from Magsat results

Nolte

Hahn

1992

Geophysical Journal International

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S U M M A R YMagsat data have been used to design scalar magnetic anomaly maps in an area that covers about half of Europe on both sides of the north-south directed European Geotraverse (EGT). The two maps refer to different altitudes and are intended to place recent compilations of aeromagnetic surveys along the EGT (Wonik er af. 1992) into global perspective.The presentation of the magnetic anomalies and their compatibility with the aeromagnetic data required (i) a suitable reference field for subtraction from the measured total field, which was derived from the field model M102089 by Cain, and (ii) a proper function of time reduction to the epoch 1980.0, which has been obtained from the actual satellite data. Because of the considerable noise in the data only those anomalies have been chosen for mapping, which show up in all Magsat tracks independent of altitude and epoch of measurement. The anomaly maps are based upon the less disturbed dawn track data, but a few dusk tracks have also been used as tie lines.The anomalies are interpreted in terms of a magnetization model, which divides the Earth's lithosphere in Europe into blocks of extension 1"N-S by 2"E-W and attributes to each block the 'Depth Integrated Magnetization' of the magnetized layer, i.e. the magnetization integrated over the vertical extension of the block. Each block is represented by a dipole parallel to the inducing core field, and the calculated model field is adjusted to the anomaly maps by trial and error, starting with an initial coarse distribution that seems plausible from the anomalies and from local geomagnetic surveys. For a realistic model field in the EGT area a rather large portion of the Earth's magnetized lithosphere outside the area under investigation must be included in the calculation.In order to check, whether the features of the magnetization model are necessary for the interpretation of the field anomalies, they are compared with the distribution of magnetization that is obtained by the application of linear inverse theory.Prominent features of the model of crustal magnetization are the contrast between high values over the East European Platform and low values in the younger parts of Europe, maxima at the iron ore districts of Kiruna and Kursk, a broad minimum centred at St Petersburg, and only small differences between the Mediterranean Sea and the adjacent continental areas. There is a fairly good agreement of these anomaly maps with the corresponding maps presented by Cain er af. (1989a).

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Magnetic anomaly maps from 40°N to 83°N derived from MAGSAT satellite data

Cited by 37 publications

References 3 publications

Small‐scale features in the Earth's magnetic field observed by Magsat

Small‐scale features in the Earth's magnetic field observed by Magsat

Heterogeneous structure of the lithosphere in the Black Sea from a multidisciplinary analysis of geophysical fields

A model of the distribution of crustal magnetization in central Europe compatible with the field of magnetic anomalies deduced from Magsat results

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