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Record Details

Record 11 of 731
Satellite magnetic anomalies over subduction zones - The Aleutian Arc anomaly
Author and Affiliation:
Clark, S. C.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Frey, H.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Thomas, H. H.(NASA Goddard Space Flight Center, Geophysics Branch, Greenbelt, MD, United States)
Abstract: Positive magnetic anomalies seen in MAGSAT average scalar anomaly data overlying some subduction zones can be explained in terms of the magnetization contrast between the cold subducted oceanic slab and the surrounding hotter, nonmagnetic mantle. Three-dimensional modeling studies show that peak anomaly amplitude and location depend on slab length and dip. A model for the Aleutian Arc anomaly matches the general trend of the observed MAGSAT anomaly if a slab thickness of 7 km and a relatively high (induced plus viscous) magnetization contrast of 4 A/m are used. A second source body along the present day continental margin is required to match the observed anomaly in detail, and may be modeled as a relic slab from subduction prior to 60 m.y. ago.
Publication Date: Jan 01, 1985
Document ID:
19850038956
(Acquired Nov 28, 1995)
Accession Number: 85A21107
Subject Category: EARTH RESOURCES AND REMOTE SENSING
Document Type: Journal Article
Publication Information: Geophysical Research Letters; p. 41-44; (ISSN 0094-8276); 12
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALEUTIAN ISLANDS (US); GEODYNAMICS; GEOMAGNETISM; MAGNETIC ANOMALIES; SATELLITE OBSERVATION; SUBDUCTION (GEOLOGY); EARTH CRUST; EARTH MANTLE; MAGSAT SATELLITES; THREE DIMENSIONAL MODELS
Imprint And Other Notes: Geophysical Research Letters (ISSN 0094-8276), vol. 12, Jan. 1985, p. 41-44.
Availability Source: Other Sources
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