Bull, J.M., Minshull, T.A., Mitchell, N.C., Thors, K., Dix, J.K. and Best, A.I.
Fault and magmatic interaction within Iceland's western rift over the last 9kyr.
Geophysical Journal International, 154, (1), . (doi:10.1046/j.1365-246X.2003.01990.x).
We present high-resolution 'Chirp' sub-bottom profiler data from Thingvallavatn, a lake in Iceland's western rift zone. These data are combined with stratigraphic constraints from sediment cores to show that movement on normal faults since 9 ka are temporally correlated with magmatic events, indicating that movements were controlled by episodic dyke intrusion. Sediment depo-centres and the focus of subsidence migrated westwards over 3-4 kyr towards the locus of subsequent brittle failure. We interpret this subsidence as related to dyke intrusion a few km along strike, originating from the Hengill volcanic system, which occurred prior to major dyking, faulting and subsidence within the lake at 1.9 ka.
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