Integrated velocity field from ground and satellite geodetic techniques: application to Arenal volcano

Cyril S Muller, Rodrigo del Potro, Juliet Biggs, Joachim H Gottsmann, Susanna K Ebmeier, Sébastien Guillaume, Paul-Henri Cattin, Rodolfo van der Laat

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Measurements of ground deformation can be used to identify and interpret geophysical processes occurring at volcanoes. Most studies rely on a single geodetic technique, or fit a geophysical model to the results of multiple geodetic techniques. Here we present a methodology that combines GPS, Total Station measurements and InSAR into a single reference frame to produce an integrated 3-D geodetic velocity surface without any prior geophysical assumptions. The methodology consists of five steps: design of the network, acquisition and processing of the data, spatial integration of the measurements, time series computation and finally the integration of spatial and temporal measurements. The most significant improvements of this method are (1) the reduction of the required field time, (2) the unambiguous detection of outliers, (3) an increased measurement accuracy and (4) the construction of a 3-D geodetic velocity field. We apply this methodology to ongoing motion on Arenal's western flank. Integration of multiple measurement techniques at Arenal volcano revealed a deformation field that is more complex than that described by individual geodetic techniques, yet remains consistent with previous studies. This approach can be applied to volcano monitoring worldwide and has the potential to be extended to incorporate other geodetic techniques and to study transient deformation
Original languageEnglish
Pages (from-to)863-879
Number of pages17
JournalGeophysical Journal International
Volume200
Issue number2
DOIs
Publication statusPublished - Feb 2015

Keywords

  • Time-series analysis
  • Spatial analysis
  • Satellite geodesy
  • Radar interferometry
  • Remote sensing of volcanoes
  • Volcano monitoring

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