Ocean tsunami that followed. Vigny et al. (2005) mention 7 GPS
campaign sites in Thailand of which two are close to Sattahip, Ko
Sichang and Ko Mattaphon. These stations are CHON and BANH (see
also Fig. 1), which are part of the so-called GEODYSSEA/THAICA
network dedicated to crustal motion studies. The network encompasses
the major plate tectonic zones in Southeast Asia. Earliest data
of precise GPS measurements go back to November 1994 and the last
campaign in Thailand before the Mw 9.2 earthquake was in late
October 2004. Several more campaigns with a higher repetition rate
followed, in order to capture the post-seismic signals. Details of these
GPS campaigns at CHON and BANH are given in Table 2.