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Abstract:
Law 21420 establishes modifications to the Chilean mining code, that mandates the regulatory agency for mining concessions, Servicio Nacional de Geología y Minería de Chile (SERNAGEOMIN) to employ SIRGAS as a modern reference framework (RF) for the management of mining geospatial information in Chile, replacing PSAD56 (South American Provisional Datum 1956) and SAD69 (South American Datum 1969).
In this project, the processing center and geodetic analysis USC develops the process to allow SERNAGEOMIN to migrate from a classic RF to a modern RF called REDGEOMIN (Red Geodésica para Minería), aligned to SIRGAS. REDGEOMIN is a kinematic RF with an associated deformation model called ADELA (Analysis of DEformation beyond Los Andes). To date, REDGEOMIN has four solutions aligned to IGS reference frame (REDGEOMIN 2019.00, 2020.00, 2021.00, and 2022.00) calculated with approximately 210 stations. From these stations, time series were calculated between the years 2009 to 2022, applying a joint model that contemplates the interseismic, coseismic, and post-seismic periods, where the latter describes the period after the telluric movement applying for their calculation combined logarithmic and exponential functions. In addition to time series, the Thin Plate Spline (TPS) method is used to interpolate what is happening between GNSS stations.
The study consists of three phases: the first, the calculation of the REDGEOMIN-ADELA which is constantly updating the time series, the second, the calculation of the transformation parameters; this phase is finished and finally, the project culminates with the implementation of the REDGEOMIN-ADELA as the first kinematic reference frame that includes seismic events in Chile.
