HR: 1340h
AN: G13B-1228    [Abstracts]
TI: A High-Rate Continuous GPS Network in Iceland for Crustal Deformation Research
AU: * Geirsson, H
EM: dori@vedur.is
AF: Icelandic Meteorological Office, Bustadavegur 9, Reykjavik, IS-150, Iceland
AU: Árnadóttir, T
EM: thora1@hi.is
AF: Nordic Volcanological Center, Institute of Earth Sciences, Sturlugata 7, Askja, Reykjavik, IS- 101, Iceland
AU: Bennett, R
EM: rab@geo.arizona.edu
AF: University of Arizona, Tectonic Geodesy Laboratory, Gould-Simpson Building #77 1040 E 4th St., Tuscon, AZ 85721, United States
AU: LaFemina, P
EM: pfemina@geosc.psu.edu
AF: Pennsylvania State Univeristy, 406 Deike Building University Park State College, Pennsylvania, PA 16802, United States
AU: Jónsson, S
EM: sj@erdw.ethz.ch
AF: Institute of Geophysics, ETH Zurich, Schafmattstrasse 30, Zurich, 8093, Switzerland
AU: Hreinsdóttir, S
EM: sigrun@geo.arizona.edu
AF: University of Arizona, Tectonic Geodesy Laboratory, Gould-Simpson Building #77 1040 E 4th St., Tuscon, AZ 85721, United States
AU: Holland, A
EM: holland1@email.arizona.edu
AF: University of Arizona, Tectonic Geodesy Laboratory, Gould-Simpson Building #77 1040 E 4th St., Tuscon, AZ 85721, United States
AU: Deutscher, J
EM: janikd@ethz.ch
AF: Institute of Geophysics, ETH Zurich, Schafmattstrasse 30, Zurich, 8093, Switzerland
AU: Ingvarsson, T
EM: thorgils@vedur.is
AF: Icelandic Meteorological Office, Bustadavegur 9, Reykjavik, IS-150, Iceland
AU: Sturkell, E
EM: sturkell@hi.is
AF: Nordic Volcanological Center, Institute of Earth Sciences, Sturlugata 7, Askja, Reykjavik, IS- 101, Iceland
AU: Villemin, T
EM: thierry.villemin@univ-savoie.fr
AF: LGCA, Université de Savoie, Le Bourget du Lac, Le Bourget du Lac, 73376, France
AB: A significant expansion of the current continuous GPS network in Iceland is well underway. The goal of the project is to install 30-40 new continuous GPS stations, with a sampling rate of 1 second or higher in selected areas of the country. Most of the sites are already installed and are collecting data and communications are being established. Currently we have in total about 50 continuous and 12 semi-continuous stations running. Eventually, the older continuous GPS stations (installed from 1999 onwards) will also be upgraded to allow high sampling rates. Many of the CGPS sites are co-located with stations in the national seismic network which is very beneficial for operation of the sites and enhanced monotoring capabilities. The national seismic network in Iceland contains 51 3-component digital stations that all are on-line. High-rate GPS observations have been used successfully to study dynamic earthquake rupture processes, for example the Denali earthquake in Alaska and the 2003 Tokachi-Oki earthquake in Japan. New GPS stations were installed in seismically active areas in the South Iceland Seismic Zone, the Reykjanes Peninsula and in Northern Iceland. We also attempt to capture volcanic processes by installing high-rate GPS stations near the three most active volcanoes in Iceland: Hekla, Grímsvotn, and Katla. These volcanoes have been active recently or are currently showing signs of unrest. Continuous GPS and recent campaign GPS measurements indicate rapid uplift (up to 2 cm/yr) over a wide area in central Iceland due to retreat of the glaciers in a warming climate. The new network already installed in central Iceland will obtain more detailed information on the rate and extent of the uplift. Implementing the 1-Hz technology in Iceland enables studies of both the dynamic as well as slower-rate processes related to earthquake and volcanic activity. The high level of volcanic and earthquake activity in Iceland makes it an ideal site for this project. In addition, we have nearly tripled the number of continuous GPS stations in Iceland, improving constraints on the plate spreading in Iceland, as well as increasing our understanding of volcanic and tectonic interaction.
UR: http://www.norvol.hi.is/~thora/ondvegi.html
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1209 Tectonic deformation (6924)
DE: 1295 Integrations of techniques
DE: 8416 Mid-oceanic ridge processes (1032, 3614)
DE: 8419 Volcano monitoring (7280)
SC: Geodesy [G]
MN: 2007 Fall Meeting