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Local magnetic fields, uplift, gravity, and dilational strain changes in Southern California ( USA).

Journal of Geomagnetism & Geoelectricity

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Abstract

Measurements of regional magnetic field near the San Andreas fault at Cajon, Palmdale and Tejon are strongly correlated with changes in gravity, areal strain, and uplift in these regions during the period 1977-1984. Because the inferred relationships between these parameters are in approximate agreement with those obtained from simple deformation models, the preferred explanation appeals to short-term strain episodes independently detected in each data set. Transfer functions from magnetic to strain, gravity, and uplift perturbations, obtained by least-square linear fits to the data, are -0.98 nT/ppm, -0.03 nT/mu Gal, and 9.1 nT/m respectively. Tectonomagnetic model calculations underestimate the observed changes and those reported previously for dam loading and volcano-magnetic observations. A less likely alternative explanation of the observed data appeals to a common source of meteorologically generated crustal or instrumental noise in the strain, gravity, magnetic, and uplift data.-from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Local magnetic fields, uplift, gravity, and dilational strain changes in Southern California ( USA).
Series title:
Journal of Geomagnetism & Geoelectricity
Volume
38
Issue:
10
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
933
Last page:
947
Number of Pages:
15