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NAMRIA develops prototype deformation model in partnership with Otago University

Tuesday 8 September 2020 3:08pm

Chris Pearson PHIVOLCS 2020
Coordination meeting and tour of facilities in PHIVOLCS.

NAMRIA continues to make headway in its initiative to modernize the Philippine Geodetic Reference System (PGRS) with the development of a prototype deformation model for the whole country. The deformation model is an integral part of the modern PGRS since it takes into account the effects of ground deformation brought on by movement of crustal plates (secular) and earthquake shifts into the geodetic control network. With a deformation model, a surveyor can correct his survey measurements and resulting coordinates for tectonic deformation.

Dr. Christopher Pearson of the Otago University – School of Surveying in New Zealand led the development of said model.  Velocity measurements from published sources, such as the Global Strain Rate Map (GSRM), as well as the data from the GPS campaigns of the Philippine Institute of Volcanology and Seismology (PHIVOLCS), were used to generate the velocity grids for the whole country aligned to the ITRF2014. Only large earthquakes (>Mw 7.0) that generated significant surface deformation, such as the Mw7.2 Bohol Earthquake in 2013, were incorporated into the model.

See the full story at www.namria.gov.ph.