Results 181 to 190 of about 33,003 (219)

Evaluation of groundwater resources in Wadi Qena, Egypt: a geophysical and hydrogeochemical perspective. [PDF]

Sci Rep
Khalifa M, Sharkawy MS, Mohamaden M, Taha A, Moneim AA, Zaki S, Masoud AM.   +6 more
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An assessment of long-wavelength magnetic anomalies over Canada

Canadian Journal of Earth Sciences, 1996
The reliability of the long-wavelength portion (> 300 km) of the magnetic field over Canada, as represented by the national aeromagnetic anomaly database compiled by the Geological Survey of Canada (GSC), is assessed by comparison with two independent data sets: a high-altitude country-wide survey carried out by the former Earth Physics Branch (EPB)
Mark Pilkington, Walter R. Roest
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Contribution of induced and remanent magnetization to long‐wavelength oceanic magnetic anomalies

Journal of Geophysical Research: Solid Earth, 1994
The Magsat mission has provided very precise measurements of Earth's magnetic field which have been used to derive accurate maps of the long‐wavelength magnetic anomaly field. Analyses of this field over localized areas have shown that induced magnetization is mainly responsible for the anomalies and that remanent magnetization is rarely detectable at ...
Yves Cohen, Jose Achache
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Interpretation of Long Wavelength Magnetic Anomalies

1981
The Earth’s magnetic field (emf) measured at or above the Earth’s surface has two main components of internal origin: a primary (or main) field which is originated in the outer core and appears as large scale features at the Earth’s surface, and a secondary field which is due to both induced and remanent magnetization of high susceptibility ...
Paolo Gasparini, Marta S. M. Mantovani, Wladimir Shukowsky   +2 more
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Magnetization of lower crustal rocks - potential sources of long wavelength anomalies

2020
<p>The occurrence and nature of primary magnetic phases in ultramafic rocks is a subject of debate. Studies of ultramafic rocks originating in the deep crust commonly report secondary magnetic phases due to later metamorphism, serpentinization, or alteration as sources for long-wavelength anomalies.
Geertje ter Maat, Suzanne McEnroe, Nathan Church, Hirokuni Oda   +3 more
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The potential contribution to long wavelength magnetic anomalies from the lithospheric mantle

Physics of the Earth and Planetary Interiors, 2019
Abstract Long-wavelength magnetic anomalies (LWMA) are broad scale variations of the magnetic field that are usually observed at high altitudes with amplitudes ranging up to about 20 nT. The source of these anomalies has typically been assumed to reside within the crust with negligible contributions from the lithospheric mantle.
Chijioke M. Idoko, James A. Conder, Eric C. Ferré, Justin Filiberto   +3 more
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Acquisition of long wavelength magnetic anomalies pre-dates continental drift

Physics of the Earth and Planetary Interiors, 1983
Abstract Using the low altitude MAGSAT satellite data, NASA recently published a new global magnetic map of anomalies. Using this new accurate map and paleomagnetic reconstructions of Gondwanaland, we point out that long wavelength anomalies were continuous in continents that are presently separated.
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Long‐wavelength magnetic anomalies in the Caribbean: Plate boundaries and allochthonous continental blocks

Journal of Geophysical Research: Solid Earth, 1989
Vector magnetic anomaly maps are derived at satellite altitude from Magsat data over the Caribbean and Middle America. To minimize smoothing of the anomaly field caused by averaging the data over the whole altitude range of Magsat measurements, two maps are derived in two nonoverlapping altitude ranges: 350–420 and 420–550 km.
Jean‐Louis Counil, Jose Achache, Armand Galdeano   +2 more
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