SCIGN Data Portal | REASoN: Data Products Definitions

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	GSAC
	SOPAC Data Browser
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	SOMI for Portals
	SOPAC SOMI Maps
	USGS Map Surfer
	REASoN Combination Coords
	REASoN Combination Vels
	SOPAC Coordinates
	REASoN Time Series
	SOPAC Pole Rotation Tables
	SOPAC Site Repeatabilities

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	REASoN Combination
	JPL
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GPS Data Products Description
	Level 0: GPS Observables and Metadata RINEX files organized by year and day-of-year Metadata: information describing equipment at GPS sites, antenna heights, installation dates, etc. Relevance: raw GPS observables and information describing them, used by scientists, surveyors and others for calculating geodetic coordinates and their time history Level 1: Coordinates, Time Series Daily update of time series from each site, based on the SCIGN combination (level 1C). This combination is produced using GIPSY (JPL) and GAMIT (SOPAC), followed by a QOCA combination at JPL. Relevance: forms the basis for all high-level products. Level 2: Velocities, Crustal Motion Model Automated update of the crustal motion field of SCIGN from the combined SCIGN time series; interval to be determined. Relevance: long-term, high-resolution monitoring of changes in Earth's surface. Level 3: Strain, Fault Slips, Aquifer Undulation, Co-seismic and Post-Seismic Deformations Strain rates and fault slip rates are the most robust measurable physical parameters related to earthquake generation on inter-seismic time scales. Aquifer undulation: rise and fall of the ground above aquifers. These will be provided for water resource management, with tectonic signal removed. Earthquake fault parameters: fault slip rates will be derived from the SCIGN crustal motion maps, and will be provided on a long-term and event-driven basis. Independent near-real-time analysis systems will be implemented. Co-seismic and rapid post-seismic displacements will be available within one hour of an earthquake event to emergency services offices, local authorities, and transportation and media outlets. Strain differentials/rates, fault slip rates, aquifer undulation, co-seismic and post-seismic fault slip rates will be calculated using a spatial temporal filter in QOCA. SCIGN strain analysis will integrate direct strain measurements from the SCIGN laser strainmeter and the USGS borehole strainmeters within SCIGN.