[Folda] Fwd: Friday Seminar 19th January - Bryndís Brandsdóttir - Postglacial tectonics within the Tjörnes Fracture Zone, North-Iceland

[Siqi Li]

-------- Original Message -------- 
Subject: Friday Seminar 19th January - Bryndís Brandsdóttir - Postglacial tectonics within the Tjörnes Fracture Zone, North-Iceland 
Date: Tuesday, January 16, 2018 09:09 GMT 
From: Maxwell Christopher Brown <maxwell at hi.is> 
To: jhi at hi.is 
 
 
Dear all,

The first talk of the new semester will be:

Bryndís Brandsdóttir (Institute of Earth Sciences)

Title: Postglacial tectonics within the Tjörnes Fracture Zone, North-Iceland

Date: Friday, 19th January
Time: 12:30
Place: 3rd Floor meeting room, Askja

Asbtract: The magma-starved southern extension of the Kolbeinsey Ridge, the
Eyjafjarðaráll rift (ER), is made up of dominantly extensional faults
merging southwards a system of right-lateral strike-slip faults with
vertical displacement up to 40 m within the Húsavík Flatey Fault Zone
(HFFZ). A 500-700 m deep asymmetric rift, with up to 30 m vertical
displacement on normal faults characterizes the northern ER whereas
transform along the HFFZ has created a NW- striking pull-apart basin with
frequent earthquake swarms. We have illuminated the tectonic framework of
the ER and Skjálfandadjúp (SK) basins using multibeam bathymetry,
high-resolution seismic reflection data (Chirp) and recent earthquake
data. Both basins contain post-glacial sediments of variable thickness.
Correlation of Chirp reflection data and tephrachronology from a sediment
core within the SK basin reveal major rifting episodes between 10-12.1
kyrs BP activating both basins, followed by smaller-scale fault movements
throughout Holocene. These vertical fault movements reflect increased
tectonic activity during early postglacial time coinciding with isostatic
rebound enhancing volcanism within Iceland.

All are welcome.

Best wishes
Maxwell

-- 
Maxwell Brown
Research specialist
Institute of Earth Sciences
University of Iceland
Askja, Room 333
Sturlugata 7
101 Reykjavík
Iceland
  
email:maxwell at hi.is
tel (office): +354-525-4730
tel (lab): +354-525-4794
tel (mobile): +354-832-0015