Present day geodynamics in Iceland monitored by a permanent network of continuous GPS stations |
| |
| Institution: | 1. Department of Geology, The College of Wooster, 944 College Mall, Scovel Hall, Wooster, OH 44691, USA;2. Department of Earth Sciences, Dickinson College, Carlisle, PA 17013, USA;3. ÍSOR, Iceland GeoSurvey, Grensávegur 9, 108 Reykjavík, Iceland;1. University of Alaska Fairbanks, Geophysical Institute/Alaska Volcano Observatory, 903 Koyukuk Drive, Fairbanks, AK 99775, USA;2. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, Florence 50121, Italy;3. Consiglio Nazionale delle Ricerche – Istituto di Geoscienze e Georisorse, Via La Pira 4, Florence 50121, Italy;4. DiSTeM, Università di Palermo, Via Archirafi 36, Palermo 90123, Italy;5. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy;6. Chalmers University of Technology, Horsalsvagen 11, SE-412 96 Gothenburg, Sweden;7. Institute of Geosciences, Goethe University, 60438 Frankfurt, Germany;8. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli Osservatorio Vesuviano, Via Diocleziano, 32-80124 Napoli, Italy;9. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Via Donato Creti 12, Bologna 40128, Italy |
| |
| Abstract: | Iceland is located on the Mid-Atlantic Ridge and thereby offers a rare opportunity to study crustal movements at a divergent plate boundary. Iceland is not only characterized by the divergence of the Eurasian and North American Plates, as several active volcanoes are located on the island. Moderate size earthquakes occur in the transform zones, causing measurable crustal deformation. In 1999 the installation of a permanent network of continuous GPS stations (ISGPS) was initiated in order to observe deformation due to unrest in the Hengill volcanic system and at the Katla volcano. The ISGPS network has been enlarged over the years and consists today of more than 25 CGPS stations. Most of the stations are located along the plate boundary, where most of the active deformation takes place. Uplift due to post-glacial rebound due to the melting of the largest glacier in Europe, Vatnajökull, is also detected by the ISGPS network. This study presents results from analysis of 9 years of data from the ISGPS network, in the global reference frame PDR05, which has been evaluated by the Potsdam-Dresden-Reprocessing group with reprocessed GPS data only. We thus determine subsidence or land uplift in a global frame. The horizontal station velocities clearly show spreading across the plate boundary of about 20 mm/a. Stations in the vicinity of the glacier Vatnajökull indicate uplift in the range of 12 mm/a, while a station in the central part of Iceland shows uplift rates of about 25 mm/a. Tide gauge readings in Reykjavik and current subsidence rates observed with CGPS agree also quite well. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
