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Geology; February, 2008; v. 36; no. 2; p. 123-126; DOI: 10.1130/G24185A.1
© 2008 Geological Society of America
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Dike-induced reverse faulting in a graben

Agust Gudmundsson*,1, Nadine Friese1, Ines Galindo2 and Sonja L. Philipp3

1 Department of Structural Geology and Geodynamics, Geoscience Centre, University of Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany
2 Instituto Geológico y Minero de España, Oficina de Proyectos de Las Palmas de Gran Canaria, Alonso Alvarado, 43, 2ºA, 35003 Las Palmas de Gran Canaria, Spain
3 Department of Structural Geology and Geodynamics, Geoscience Centre, University of Göttingen, Goldschmidtstrasse 3, D-37077 Göttingen, Germany

Normal-fault slip of the boundary faults of a graben is commonly attributed to dike-induced stresses. Here, however, we report for the first time clear field evidence of a large dike-induced reverse-fault slip on a fault associated with a volcano-tectonic graben. The measured reverse faulting of at least 5 m occurs in the Holocene rift zone of northern Iceland. The reverse slip has apparently occurred on an existing normal fault as a result of over pressure of a nearby 6–13-m-thick 8 ka feeder dike. A numerical model of the dike-fault interaction supports our interpretation. The results indicate that dikes, particularly potential feeder dikes, may cause large reverse slips on nearby normal faults. This conclusion should improve the general understanding of geodetic deformation during volcanic unrest periods and may help forecast dike-fed eruptions.

Key Words: feeder dikes • rift zones • normal faults • reverse faults • surface deformation • volcanic risk • Iceland






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