Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 2.883 IF 2.883
  • IF 5-year value: 3.321 IF 5-year
    3.321
  • CiteScore value: 3.07 CiteScore
    3.07
  • SNIP value: 1.336 SNIP 1.336
  • IPP value: 2.80 IPP 2.80
  • SJR value: 1.024 SJR 1.024
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 81 Scimago H
    index 81
  • h5-index value: 43 h5-index 43
Volume 9, issue 4
Nat. Hazards Earth Syst. Sci., 9, 1177–1187, 2009
https://doi.org/10.5194/nhess-9-1177-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nat. Hazards Earth Syst. Sci., 9, 1177–1187, 2009
https://doi.org/10.5194/nhess-9-1177-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  17 Jul 2009

17 Jul 2009

Strain rate patterns from dense GPS networks

M. Hackl1, R. Malservisi1,2, and S. Wdowinski2 M. Hackl et al.
  • 1Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität, 80333 München, Germany
  • 2Division of Marine Geology and Geophysics, University of Miami, Florida 33149-1098, USA

Abstract. The knowledge of the crustal strain rate tensor provides a description of geodynamic processes such as fault strain accumulation, which is an important parameter for seismic hazard assessment, as well as anthropogenic deformation. In the past two decades, the number of observations and the accuracy of satellite based geodetic measurements like GPS greatly increased, providing measured values of displacements and velocities of points. Here we present a method to obtain the full continuous strain rate tensor from dense GPS networks. The tensorial analysis provides different aspects of deformation, such as the maximum shear strain rate, including its direction, and the dilatation strain rate. These parameters are suitable to characterize the mechanism of the current deformation. Using the velocity fields provided by SCEC and UNAVCO, we were able to localize major active faults in Southern California and to characterize them in terms of faulting mechanism. We also show that the large seismic events that occurred recently in the study region highly contaminate the measured velocity field that appears to be strongly affected by transient postseismic deformation. Finally, we applied this method to coseismic displacement data of two earthquakes in Iceland, showing that the strain fields derived by these data provide important information on the location and the focal mechanism of the ruptures.

Publications Copernicus
Download
Citation