Análise do comportamento do PPP e do TEC ionosférico no pós-processamento de dados GNSS de terremotos ocorridos no Chile: Maule M8.8 em 2010 e Iquique M8.2 em 2014

Analysis of the behavior of PPP and ionospheric TEC in the post-processing GNSS data from earthquakes in Chile: Maule M8.8 in 2010 and Iquique M8.2 in 2014

Abstract

GNSS positioning has been a powerful tool in seismology, enabling to monitoring of crustal movements during seismic events, monitor the influence of the atmospheric gravity waves on the Total Electron Content (TEC), and even quantifying seismic wave, often with significant advantages over land-based seismographs. Therefore, the goal of this study is to contribute to research that employs GNSS in earthquake analysis by identifying seismic signatures in the GNSS positioning and TEC, as well as by analyzing ionospheric disturbances associated with seismic events. Thereby, two case studies were carried out for seismic events in Chile: the Maule earthquake (Mw 8.8) on February 27, 2010, and the Iquique earthquake (Mw 8.2) on April 1, 2014. In this study, PPP solutions and TEC data were analyzed using observations from GNSS stations located near the earthquake epicenters. The details and nature of earthquakes remain challenging through observations of traditional techniques. Therefore, the discussions presented in this article support the application of PPP and also brought some important perspectives for future studies in this area. This is a necessary bias for the implementation of measures aimed at improving the mechanisms responsible for monitoring and preventing high-intensity earthquakes occurrences in vulnerable areas.