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Geology; August 1999; v. 27; no. 8; p. 703-706; DOI: 10.1130/0091-7613(1999)027<0703:SATOML>2.3.CO;2
© 1999 Geological Society of America
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Shortening and thickening of metropolitan Los Angeles measured and inferred by using geodesy

Donald F. Argus1, Michael B. Heflin1, Andrea Donnellan1, Frank H. Webb1, Danan Dong1, Kenneth J. Hurst1, David C. Jefferson1, Gregory A. Lyzenga1, Michael M. Watkins1 and James F. Zumberge1

1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA

Geodetic observations using the Global Positioning System (GPS) and other techniques record a high rate of north-south shortening in an east-southeast–trending, 5–40-km-wide belt in northern metropolitan Los Angeles, California. Downtown Los Angeles is observed to be converging upon the southern San Gabriel Mountains at 6 mm/yr. Aside from the elastic strain that will be released during earthquakes rupturing the San Andreas and San Jacinto faults, east-west lengthening across northern metropolitan Los Angeles is minor, <2.5 mm/yr. Therefore north-south shortening is accommodated mainly by vertical crustal thickening.




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