000196407 001__ 196407
000196407 003__ CZ-ZdVUG
000196407 005__ 20220607110909.0
000196407 041__ $$aeng
000196407 040__ $$aABC039$$bcze
000196407 1001_ $$aVáclavovic, Pavel
000196407 24510 $$aEarthquake Magnitude Estimation using Precise Point Positioning
000196407 300__ $$a10 stran
000196407 5203_ $$aAn accurate estimation of an earthquake magnitude plays an important role in targeting emergency services towards affected areas. Along with the traditional methods using seismometers, site displacements caused by an earthquake can be monitored by the Global Navigation Satellite Systems (GNSS). GNSS can be used either in real-time for early warning systems or in offline mode for precise monitoring of ground motion. The Precise Point Positioning (PPP) offers an optimal method for such purposes, because data from only one receiver are considered and thus not affected by other potentially not stable stations. Precise external products and empirical models have to be applied, and the initial convergence can be reduced or eliminated by the backward smoothing strategy or integer ambiguity resolution. The product for the magnitude estimation is a peak ground displacement (PGD). PGDs observed at many GNSS stations can be utilized for a robust estimate of an earthquake magnitude. We tested the accuracy of estimated magnitude scaling when using displacement waveforms collected from six selected earthquakes between the years 2016 and 2020 with magnitudes in a range of 7.5–8.2 Moment magnitude MW. We processed GNSS 1Hz and 5Hz data from 182 stations by the PPP method implemented in the G-Nut/Geb software. The precise satellites orbits and clocks corrections were provided by the Center for Orbit Determination in Europe (CODE). PGDs derived on individual GNSS sites formed the basis for ground motion parameters estimation. We processed the GNSS observations by the combination of the Kalman filter (FLT) and the backward smoother (SMT), which significantly enhanced the kinematic solution. The estimated magnitudes of all the included earthquakes were compared to the reference values released by the U. S. Geological Survey (USGS). The moment magnitude based on SMT was improved by 20% compared to the FLT-only solution. An average difference from the comparison was 0.07 MW and 0.09 MW for SMT and FLT solutions, respectively. The corresponding standard deviations were 0.18 MW and 0.22 MW for SMT and FLT solutions, which shows a good consistency of our and the reference estimates.
000196407 6112_ $$aIOP Conference Series: Earth and Environmental Science; 7th World Multidisciplinary Earth Sciences Symposium, WMESS 2021$$cPraha$$d6.9.2021
000196407 655_4 $$asbornikove prispevky
000196407 7001_ $$aNosek, Jakub
000196407 7730_ $$92021$$dIOP Publishing Ltd.,2021.$$x17551307
000196407 8564_ $$uhttps://iopscience.iop.org/article/10.1088/1755-1315/906/1/012107
000196407 85642 $$ahttps://www.isvavai.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F21%3AN0000037%21RIV22-MSM-00025615
000196407 910__ $$aABC039
000196407 980__ $$asborniky_konferencni
000196407 985__ $$avaclavovic
000196407 985__ $$anosek
000196407 985__ $$ariv
000196407 985__ $$autvar24