Abstract
AbstractSubduction activity near Sumatra Island has frequently generated earthquakes, making this region an active tectonic area in the world. As one of the disaster mitigation actions in earthquake zone societies, geodynamic analysis is needed to model an earthquake probability. The geodynamic study is easier to complete with a new Global Positioning System (GPS) technology. By using the continued GPS method, it can analyze a deformation at the earthquake phases, the silent/stable period with no earthquake occurrence (preseismic), the period after the earthquake (postseismic), and the period during the earthquake rupture (coseismic). This work conducted deformation analyzes of pre-, co-, and postseismic associated with the Mw 6.0 Mentawai earthquake using Sumatran Global Positioning System Array (SuGAr) data. The earthquake occurred on February 2, 2019, through a thrust fault mechanism. SuGAr data were processed using GAMIT/GOLBK 10.7 software. Several stations around the earthquake's epicenter were use, i.e., KTET, LAIS, LNNG, MKMK, MLKN, PPNJ, SIOB, SLBU, SMGY, TARA, TIKU, and TRTK. During the preseismic phase, the deformation vector is about 2.37–7.20 mm northeastward, the same direction as that of subduction of the Indo-Australian plate towards Eurasia. The largest deformation vector in the coseismic phase is 25.3 mm southwestward was observed at the SMGY station. After the earthquake (postseismic), the vector deformation was 1.13–16.33 mm to the southwest, indicating that there is still a release of earthquake energy in this postseismic phase, which still lasts for 30 days.KeywordsCoseismicDeformation analysisPostseismicPreseismic
Published Version
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