Rift-transform kinematics in south Iceland: deformation from global positioning system measurements, 1986 to 1992

F. Sigmundsson, P. Einarsson, R. Bilham, E. Sturkell

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95 Citations (Scopus)

Abstract

Crustal deformation in the plate boundary regions in south Iceland is estimated from repeated Global Positioning System (GPS) geodetic measurements in the period 1986-1992. The study compares coordinate solutions for the 1986 and 1989 surveys with the results from the most recent survey in 1992. Little internal deformation is observed in the area west of the western volcanic zone (within the North American plate) and at the southern tip of the eastern volcanic zone (within the North American plate) and at the southern tip of the eastern volcanic zone (within the Eurasian plate). The observed relative velocity of these two areas is 2.1 ± 0.4 cm/yr in direction N117 ± 11°E (1σ uncertainties), compatible with the 1.94 cm/yr widening in direction N104°E across south Iceland predicted from the NUVEL-1 global plate motion model. Left-lateral shear strain is developing across the intervening transform zone, the E-W trending south Iceland sesimic zone (SISZ). It is concluded that historical seismicity in the SISZ can be attributed to left-lateral shear accumulation across the seismic zone at a similar rate throughout historical times as during the years 1986-1992. -from Authors

Original languageEnglish
Pages (from-to)6235-6248
Number of pages14
JournalJournal of Geophysical Research
Volume100
Issue numberB4
DOIs
Publication statusPublished - 1995

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