Measurements of strain at plate boundaries using space based geodetic techniques

Details Measurements of strain at plate boundaries using space based geodetic techniques Measurements of strain at plate boundaries using space based geodetic techniques

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1811r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 17, p. 1811-1814.

Physics

2

Geodetic Surveys, Plates (Tectonics), Spaceborne Lasers, Strain Measurement, Subduction (Geology), Very Long Base Interferometry, Deformation, San Andreas Fault

Scientific paper

We have used the space based geodetic techniques of Satellite Laser Ranging (SLR) and VLBI to study strain along subduction and transform plate boundaries and have interpreted the results using a simple elastic dislocation model. Six stations located behind island arcs were analyzed as representative of subduction zones while 13 sites located on either side of the San Andreas fault were used for the transcurrent zones. The length deformation scale was then calculated for both tectonic margins by fitting the relative strain to an exponentially decreasing function of distance from the plate boundary. Results show that space-based data for the transcurrent boundary along the San Andreas fault help to define better the deformation length scale in the area while fitting nicely the elastic half-space earth model. For subduction type bonndaries the analysis indicates that there is no single scale length which uniquely describes the deformation. This is mainly due to the difference in subduction characteristics for the different areas.

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