From igs-rf at ign.fr Wed Jan 18 22:01:34 2023 From: igs-rf at ign.fr (igs-rf at ign.fr) Date: Wed, 18 Jan 2023 23:01:34 +0100 (CET) Subject: [IGSSTATION-8561] Possible co-seismic displacements: BTNG, PGEN Message-ID: <20230118220134.04D8ED4C018@newsmtp.ign.fr> # Author : Paul Rebischung # Contact : igs-rf at ign.fr # Subject : Possible co-seismic displacements: BTNG, PGEN # # This is a notification that recent earthquake(s) may have induced noticeable displacements of one or more IGS stations. # # This message and the table below were generated automatically based on the following procedure: # * The Global Centroid-Moment-Tensor (CMT) catalog (https://www.globalcmt.org/) is scanned every day for new earthquakes. # * For every new earthquake, the width, length and slip of the rupture are estimated from: # - Yen & Ma (2012; https://doi.org/10.1785/0120100046)'s scaling law if the earthquake magnitude is less than 7.6; # - Mai & Beroza (2000; https://doi.org/10.1785/0119990126)'s scaling law it the earthquake magnitude is larger. # (See justification for these choices in M?tivier et al., 2014; https://doi.org/10.1002/2014JB011280.) # * For every new earthquake, based on its estimated CMT and rupture parameters, co-seismic displacements are calculated # at all IGS stations using Okada (1985; https://doi.org/10.1785/BSSA0750041135)'s approach. Given that the CMT inversion # from seismic waves gives rise to two possible solutions for the rupture plane, two possible co-seismic displacements # are calculated for every station and earthquake. # * If any calculated 3D co-seismic displacement of an IGS station exceeds 1 mm, it is included in the table below. # # Warning : The co-seismic displacements thus calculated rely on several coarse approximations. They should not be used as # estimates of the actual co-seismic displacements, but only as rough orders of magnitude. # # The column "RF?" in the table below indicates whether each station is part of the current IGS reference frame (IGS20), # hence might need to stop being used as a reference frame station after the earthquake. # #__________station_________ ___________________________earthquake_____________________________ dist_ _____displacement1_____ _____displacement2_____ #sta_ lon[deg] lat[deg] RF? date_______________ Mw_ location________________ lon[deg] lat[deg] d[km] dE[mm]_ dN[mm]_ dH[mm]_ dE[mm]_ dN[mm]_ dH[mm]_ #----------------------------------------------------------------------------------------------------------------------------------------------------------- BTNG 125.190 1.439 No 2023-01-18 06:06:14 7.0 Northern Molucca Sea 127.050 2.740 252 2.1 0.4 0.3 2.1 0.5 0.3 PGEN 125.132 6.065 No 2023-01-18 06:06:14 7.0 Northern Molucca Sea 127.050 2.740 427 -0.2 1.0 -0.2 -0.3 1.0 -0.2