Welcome!
This is the web-page of Elske de Zeeuw-van Dalfsen. I am currently working as a post-doc at the Institut de Physique du Globe in Paris, France.This post-doc is funded by a Marie Curie Intra European Fellowship which will fund me until January 2010.
Research Interests
Through my research I aim to improve the understanding of volcanic processes. My first exposure to volcanology occured during an internship at the Hawaiian Volcano Observatory in the U.S.A. After that I worked as a volunteer for the volcano monitoring division of PHIVOLCS (Philippines), VSI (Indonesia), and NVI (Iceland), learning all about the different techniques used to monitor and research active volcanoes. I am mostly interested in the different geodetic techniques to study volcanoes such as GPS, precise leveling, EDM measurements and Satelite Interferometry.Contact details
IPGP
Equipe de Dynamique des Fluides Geologiques
4 Place Jussieu
75252 Paris Cedex 05
France
phone: +33 144274697
e-mail
CV
Here is a link to my CV which was last updated in April 2007.
Current projects
I am currently working on two projects:
Eyjafjallajokull:
The Eyjafjallajokull volcano in S Iceland experienced two periods of unrest in 1994 and 1999. This activity was monitored by seismic and geodetic (InSAR, GPS, tilt) measurements. The existing data have been analysed by Pedersen and Sigmundsson (2004 and 2006), Sturkell et al. (2003) and Dahm and Brandsdottir (1997) (references). However, several observations remain unexplained with the current models. This includes the subsidence at the GPS-station STEI, the different locations of the main earthquake swarm (N) and the uplift (S) and the horizontal component measured by GPS at station SELJ. By introducing simple fluid dynamics, we aim to improve the understanding of the dynamics of Eyjafjallajokull volcano.
Askja:
Askja caldera in N Iceland has been subsiding with a rate of ~4 cm/yr at least since 1983. This has been observed with geodetic techniques such as precise levelling, tilt, GPS (Sturkell et al., 2004) and InSAR (Pagli et al., 2006). Micro-gravity measurements of the area have also been conducted and showed mass moving out of the system (de Zeeuw-van Dalfsen et al., 2005) (references). We will analyse 10 RADARSAT images of the Askja caldera covering the 2000-2008 period. Succesfull creation of interferometric images will allow us to monitore, analyse and model this subsidence in more detail. This will be the first time radarsat image have been used to study an Icelandic volcano. A second step will be to include simple fluid dynamics to improve the understanding of the magma plumbing system at Askja caldera.
Ph.D.
In 2005 I finished my PhD in Volcanology at the Open University in Milton Keynes, UK. During my PhD I was supervised by Hazel Rymer, Dave Rothery, Glyn Williams-Jones and Freysteinn Sigmundsson.
The title of my Ph.D. is: "A geophysical study of volcanic processes at a persistently active volcano and at two calderas in a state of unrest.". Here are links to the complete thesis and the abstract:
Thesis
Abstract
During my Ph.D. I used micro-gravity techniques in combination with geodetic measurements to unravel the volcanic processes at Stromboli in Italy and the Askja and Krafla caldera's in Iceland. I also learned how to create and analyse Interferometric Satelite images using the DIAPASON software. The work resulted in the following publiced papers:
* de Zeeuw-van Dalfsen, E., R. Pedersen, F. Sigmundsson, and C. Pagli (2004), Satellite radar interferometry 1993–1999 suggests deep accumulation of magma near the crustmantle boundary at the Krafla volcanic system, Iceland, Geophys. Res. Lett., Vol. 31, L13611, doi:10.1029/2004GL020059.
* de Zeeuw-van Dalfsen, E., Rymer, H., Sigmundsson, F., and Sturkell, E (2005), Net gravity decrease at Askja volcano, Iceland: Constraints on processes responsible for continuous caldera deflation, 1988 – 2003. JVGR, Vol. 139/3-4, pp 227-239.
* de Zeeuw-van Dalfsen, E., Rymer, H., Williams-Jones, G., Sturkell, E., and Sigmundsson, F (2006), Integration of micro-gravity and geodetic data to constrain shallow system mass changes at Krafla volcano, N Iceland. Bull. Of Volcanology, Vol. 68: 420-431.
If you would like to request a pdf please click here !
Photos
Iceland 2002-2003
These pictures were taken during two fieldwork trips to Askja and Krafla caldera in Iceland.
Hawaii 1999-2000
These pictures were taken during two volunteerships at the HVO.
Philippines 1999-2000
These pictures were taken during two volunteerships with PHIVOLCS.
Family
I currently live with my family in the small town of Yerres south of Paris. If you would like to see some pictures please login or send me an e-mail to request the password.
Links
Some web-sites I like to visit:
* To find out about everything: Wikipedia* To find your way around the world: Mappy
* Up to date news, weather etc:the BBC
References:
* Pagli et al. (2206),
* Pedersen, R. and Sigmundsson, F. (2006), Temporal development of the 1999 intrusive episode in the Eyjafjallajokull volcano, Iceland, derived from InSAR images. Bull. Volc. 68: 377-393.
* Pedersen, R and Sigmundsson, F. (2004), InSAR based sill models links spatially offsetb areas of deformation and seismicity for the 1994 unrest episode at Eyjafjallajokull volcano, Iceland. Geoph. Res. Letters Vol. 31, L14610.
* Sturkell et al. (2003), Unrest and magma movements at Eyjafjallajokull and Katla volcanoes, Iceland. JGR 108, B8, 2369.
* Dahm, T and Brandsdottir, B. (1997) Moment tensors of micro-earthquakes from the Eyjafjallajokull volcano in south Iceland, Geophys. J. Int., 130, 183-192.
* Sturkell, E., Sigmundsson, F. (2000), Continuous deflation of the Askja caldera Iceland, during the 1983–1998 non-eruptive period. J. Geophys. Res. 105, 25671– 25684.
* Sturkell et al. (2006), Volcano geodesy and magma dynamics in Iceland. Journal of Volcanology and Geothermal Research 150 (2006) 14– 34.