Abstract
We examined the experience in using global, regional, and local coordinate reference systems. It is shown that the use of a local GNSS reference system for measuring station coordinates and for monitoring their changes over time enhances the accuracy and reliability in the estimation of pre- co-, and post-seismic crustal movements and deformations because of the shortest base lines being involved in the processing. The use of a local reference system also simplifies the data processing procedures. We did a test calculation to see how the configuration of a GNSS observation network affects the accuracy of the observations. An experiment based on a large amount of measured information showed that the option where the number of redundant observations is twice as low is more accurate by a factor of 1.5 owing to the exclusion of long baselines. The efficiency of determining spatial movements was estimated using Fisher’s test to demonstrate that the reduced network (where long lines have been excluded from calculation) has the variance of desired characteristics significantly larger than the variance of observation errors.
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This work was supported within the framework of a state assignment at the Geophysical Center, Russian Academy of Sciences approved by the Ministry of Education and Science of the Russian Federation.
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Kaftan, V.I., Tatarinov, V.N. An Analysis of Possibilities of GNSS Local Strain Monitoring Networks in Earthquake-Prone Areas. J. Volcanolog. Seismol. 15, 379–386 (2021). https://doi.org/10.1134/S074204632106004X
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DOI: https://doi.org/10.1134/S074204632106004X