[IGSSTATION-8656] Possible co-seismic displacements: ANTC, CHOF, KOUC, MTKA, NRMD, PTVL, SSIA, TONG

[igs-rf at ign.fr]

# Author : Paul Rebischung
# Contact : igs-rf at ign.fr
# Subject : Possible co-seismic displacements: ANTC, CHOF, KOUC, MTKA, NRMD, PTVL, SSIA, TONG
# 
# 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 Métivier 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]_
#-----------------------------------------------------------------------------------------------------------------------------------------------------------
 KOUC  164.287  -20.559 Yes   2023-05-19 02:57:07 7.7 Southeast Of Loyalty Isl  170.690  -23.230     724      -0.6     1.0     0.3      -0.6     1.0     0.3
 NRMD  166.485  -22.228 Yes   2023-05-19 02:57:07 7.7 Southeast Of Loyalty Isl  170.690  -23.230     445      -0.8     1.5     1.2      -0.8     1.5     1.2
 PTVL  168.315  -17.749 Yes   2023-05-19 02:57:07 7.7 Southeast Of Loyalty Isl  170.690  -23.230     658      -1.2     3.9    -0.5      -1.2     3.9    -0.5
 CHOF  139.531   35.675 No    2023-05-26 10:03:24 6.2 Near East Coast Of Honsh  140.520   35.520      91       1.6    -0.3    -0.6       1.6    -0.3    -0.6
 MTKA  139.561   35.680 No    2023-05-26 10:03:24 6.2 Near East Coast Of Honsh  140.520   35.520      88       1.6    -0.3    -0.7       1.6    -0.3    -0.7
 TONG -175.179  -21.145 No    2023-06-15 18:06:28 7.2 South Of Fiji Islands    -177.210  -22.980     292      -0.5    -0.7    -0.6      -0.5    -0.8    -0.6
 ANTC  -71.532  -37.339 Yes   2023-07-17 03:05:11 6.7 Southern Argentina        -70.370  -38.190     139      -0.7     0.7     1.1      -0.7     0.7     1.1
 SSIA  -89.116   13.697 No    2023-07-19 00:22:08 6.5 Off Coast Of Central Ame  -88.130   12.810     145       0.6    -0.8    -0.3       0.6    -0.8    -0.3