Analysis of effects of the Laos earthquake on November 20th, 2019 to some continuously operation reference stations in northern Vietnam

Abstract

The earthquake hit the border of Laos and Thailand on November 20th, 2019 with a magnitude of 6,2, causing some vibrations in northern Vietnam even more than 400 km from the epicenter. In order to consider its impact on some of the permanent GNSS stations in the north Vietnam area, we used the precise point positioning method to process the GNSS data of these stations in 2 days 20 and 21/11/2019. The maximum deviation of coordinates between the 2 days at the 24 hour static solutions is 3,6 mm on the horizontal and 5,9 mm on the up component. These values are less than 2 times their root mean square errors. Therefore, we conclude that no change of location of CORS stations has been detected due to the impact of the earthquake.