Seismic risk at the rift-transform junction in north Iceland

Details Seismic risk at the rift-transform junction in north Iceland Seismic risk at the rift-transform junction in north Iceland

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3689j&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3689-3692

Physics

3

Geodesy And Gravity: Crustal Movements-Interplate, Geodesy And Gravity: Space Geodetic Surveys, Seismology: Seismicity And Seismotectonics

Scientific paper

The current tectonics of north Iceland are characterized by max M 6-7 earthquakes in the transform zone between the northern rift zone and the Kobleinsey Ridge. The last rifting period (1975-1984) was associated with an opening of up to 9 m along the Krafla fissure swarm. This period was followed by the disappearance of microseismicity along the eastern part of Husavik-Flatey Fault, the main structure of the transform zone. A GPS network was occupied in 1995 and again in 1997 to study present-day deformation on both sides of the on-land part of HFF and around its junction with the northern rift zone. The main deformational features observed are: (1) in Tjörnes, the HFF is locked above the ductile/brittle boundary below which ductile creep is occurring, and (2) aseismic opening along the Theystareykir and Krafla fissure swarms and along a N120°E superficial fault that marks the southern boundary of Tjörnes.

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