Fracture kinematics and holocene stress field at the krafla rift, northern iceland

Noemi Corti, Fabio L. Bonali, Federico Pasquaré Mariotto, Alessandro Tibaldi, Elena Russo, Ásta Rut Hjartardóttir, Páll Einarsson, Valentina Rigoni, Sofia Bressan

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

Útdráttur

In the Northern Volcanic Zone of Iceland, the geometry, kinematics and offset amount of the structures that form the active Krafla Rift were studied. This rift is composed of a central volcano and a swarm of extension fractures, normal faults and eruptive fissures, which were mapped and analysed through remote sensing and field techniques. In three areas, across the northern, central and southern part of the rift, detailed measurements were collected by extensive field surveys along the post-Late Glacial Maximum (LGM) extension fractures and normal faults, to reconstruct their strike, opening direction and dilation amount. The geometry and the distribution of all the studied structures suggest a northward propagation of the rift, and an interaction with the Húsavík–Flatey Fault. Although the opening direction at the extension fractures is mostly normal to the general N– S rift orientation (average value N99.5° E), a systematic occurrence of subordinate transcurrent com-ponents of motion is noticed. From the measured throw at each normal fault, the heave was calcu-lated, and it was summed together with the net dilation measured at the extension fractures; this has allowed us to assess the stretch ratio of the rift, obtaining a value of 1.003 in the central sector, and 1.001 and 1.002 in the northern and southern part, respectively.

Upprunalegt tungumálEnska
Númer greinar101
Síður (frá-til)1-27
Síðufjöldi27
FræðitímaritGeosciences (Switzerland)
Bindi11
Númer tölublaðs2
DOI
ÚtgáfustaðaÚtgefið - feb. 2021

Athugasemd

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© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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