VADASE uses time-differenced carrier-phase measurements to estimate station velocity with mm-level accuracy using only broadcast satellite orbit and clock corrections. These velocity estimates are then integrated to derive station displacements. These characteristics are well suited for earthquake monitoring since the method does not rely on external communication channels which are often among the first components to fail during an earthquake. But how does VADASE compare to a PPP solution?
GNSS play a significant role in geodynamic applications. Even though tectonic motions are in the order of a few millimeters to centimeters per year, the accuracy of high-end GNSS equipment is well suited to detect such displacements. The magnitude and direction of GNSS station displacements following an earthquake can also provide valuable information on the type of crustal movements encountered. In this post, I take a look at a GNSS station affected by the magnitude 7.8 earthquake in Nepal.