Preliminary co-seismic displacement for 2019 November 26 Mw 6.4 earthquake in Albania from the analysis of GPS stations
INGV-ONT Geodesy Lab Working Group and Rexhep Koci ª, Llambro Duni ª, Neki Kuka ª
ª Department of Seismology, Institute of Geosciences, Energy, Water and Environment Tirana, Albania
Following the 2019 November, 26 MW 6.4 earthquake, INGV, in collaboration with the Department of Seismology, Institute of Geosciences, Energy, Water and Environment Tirana (IGEWE), Albania started a detailed ground deformation monitoring in the epicentral area using the Global Positioning System (GPS) technique (INGV Working group “GPS Geodesy”, https://doi.org/10.5281/zenodo.61355). Continuous GPS stations from the IGEWE and ALBPOS (http:// 220.127.116.11) provided raw rinex data available at http://geo.edu.al/gnss). Data from continuous GPS stations operating during the Mw=6.4 November earthquake have been downloaded in the following hours or days, and processed by INGV-ONT GPS data analysis centers, using two different analysis software (GAMIT/GLOBK and GIPSY), and later combined in a single, consensus, co-seismic solution (e.g., Devoti, 2012; Serpelloni et al., 2012). Figure 1 shows the measured co-seismic displacements for the Mw=6.4 November 26 earthquake and the distribution of the different GPS stations operating in the epicentral area. The co-seismic displacements have been estimated starting from the position time-series, as the difference between the average position for the 14/11/2019-26/11/2019 interval and the position on the day following the earthquake (27/11/2019). For the November 26 event, the maximum horizontal and vertical co-seismic displacements have been observed at the stations DUR2 (2.4 cm towards south-west, 1.1 cm of vertical motion). The DUR2 station belonging to the ALBPOS network is installed on the roof of a building. It was not possible to verify that the building has not been damaged, therefore the movement of this station must be considered as preliminary.
The table reporting the coseismic offsets for the November, 26 event is available at the following links: http://ring.gm.ingv.it/wp-content/uploads/2019/12/GMT_CombiALBANIA.dat
Devoti, R. (2012), Combination of coseismic displacement fields: a geodetic perspective, Ann Geophys-Italy, doi:10.4401/ag-6119.
Serpelloni, E. et al. (2012), GPS observations of coseismic deformation following the May 20 and 29, 2012, Emilia seismic events (northern Italy): data, analysis and preliminary models, Annals of Geophysics, 55(4), doi:10.4401/ag-6168.