The Development of Deformation Model for Semi-Dynamic Datum of Indonesia

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Susilo Susilo1, Irwan Meilano2, Hasanuddin Zainal Abidin2, Benyamin Sapiie2, Joni Efendi3, Antonius Bambang Wijanarto1,3 and Arief Syafii1, (1)Badan Informasi Geospasial, Cibinong, Indonesia, (2)Bandung Institute of Technology, Bandung, Indonesia, (3)Geospatial Information Agency Indonesia, Cibinong, Indonesia
A new geocentric datum for Indonesia was launched on 11 October 2013 namely the Indonesian Geospatial Reference System 2013 (IGRS 2013). The IGRS 2013 is a semi -dynamic datum in nature that uses the global ITRF2008 with a reference epoch on 1 January 2012. A deformation model that incorporates tectonic block motion and earthquakes related deformations, was used to transform coordinates at an observation epoch to or from this reference epoch. GPS observations from campaigns and continuous network in Indonesia for the period between 1996 and 2014 were used to determine velocities field. Secular velocity was separated from co-seismic offset and post-seismic transients present in the GPS time series. Using the secular velocities field, the interseismic block rotation parameters were estimated for each tectonic block in Indonesia. A preliminary result shows that the magnitude of deformation model due to tectonic block rotation is more than 15 mm/yr.