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  • Geodetic horizontal velocity and strain rate fields around Lake Vänern (SW Sweden) derived from GPS measurements between 1997 and 2011
  • 2012
  • Proceedings (redaktörskap) (refereegranskat)abstract
    • In 1989, the Värmland GPS network consisting of 8 stations spaced an average of 60 km apart was setup to monitor the ongoing deformation in and around Lake Vänern due to tectonic and mainly Glacial Isostatic Adjustment (GIA) processes in Fennoscandia. This network covers an area of about 10000 km2, straddles the Protogine and the Mylonite zones and includes one of the most active seismic zones of Sweden. We use GAMIT-GLOBK software to process the past GPS data, collected in October 1997, the only campaign that was measured with choke ring antenna, and the new GPS measurements in October 2010 and 2011 to estimate station velocities. We also integrate our local network with the SWEPOS (Swedish Permanent GPS network) and IGS (International GNSS Service) stations to better constrain the velocity fields in ITRF2008 and Eurasia-fixed reference frames. Since the rates of horizontal movements are very slow (less than 1 mm/year), our measurements in longer time spans (at least in 13 years, between 1997 to 2010, 2011 and planned 2012) better resolve the tectonic signal from the noise. Preliminary results obtained from campaign-mode measurements in 1997, 2010 and 2011 agree well with those reported in the latest study by Lidberg et al. (2010) who used the data from permanent GPS stations of the BIFROST (Baseline Inferences for Fennoscandian Rebound Observations Sea Level and Tectonics) project. Strain-rate analysis resulting from the obtained velocities illustrates the overall extensional component trending NW-SE with local variations. Adding more campaigns in 2012 and 2013 will surely increase the reliability of our analysis. The velocity field obtained from this research will add more details to the tectonic picture generated by BIFROST. The results are also relevant to GIA modeling, geodetic vs. seismic strain accumulation, waste isolation and seismic hazards.
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  • Groundwater Arsenic Contamination in the Bengal Delta Plain of Bangladesh : KTH Special Publication. Proceedings of the KTH-Dhaka University Seminar
  • 2001
  • Proceedings (redaktörskap) (refereegranskat)abstract
    • The Bengal Delta Plain, like many deltas in Asia, is densely populated. Natural conditions are favourable in terms of soil fertility and abundance of water resources for cultivation. Groundwater is abundant and easily accessible by wells. However, the well drilling campaigns during the last few decades, intended to supply safe water to nearly 97% the population, have turned out to bring out water with toxic levels of arsenic over large areas of the country. The mechanisms of the arsenic mobilisation are not well understood and two conflicting hypothesis have been forwarded. Any measure to improve the situation has to be based on correct understanding of the geochemistry, as incorrect interpretations may worsen the situation. In order to study the mechanisms of arsenic mobilisation, and options for low-cost remediation, a collaborative research project had been initiated by KTH in co-operation with the Department of Geology, Dhaka University, Bangladesh commencing from January, 1999. Sida-SAREC has provided funding for a three year research project. As a starting point and a summing up of the present knowledge a seminar was jointly organised by the Departartment of Geology at the Dhaka University and the Groundwater Arsenic Research Group, Department of Civil and Environmental Engineering at KTH. The present volume is a documentation of a a seminar jointlly organised by the Department of Geology at the Dhaka University and the Department of Civil and Environmental Engineering at KTH. The seminar was aimed at giving a good starting point for future co-operation. The co-operation had already started in the form of thesis works for M. Sc. students following the M. Sc. course Environmental Engineering at KTH. This and part of the coming co-operation is funded by Sida. The University of Dhaka kindly took the trouble of all the local arrangements and provided a major scientific contribution to the seminar. The Swedish Ambassador in Bangladesh honoured the seminar by opening the sessions.
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