[IGSSTATION-8801] Possible co-seismic displacements: AIRA, ANTF, GMSD, UNSA

[igs-rf at ign.fr]

# Author : Paul Rebischung
# Contact : igs-rf at ign.fr
# Subject : Possible co-seismic displacements: AIRA, ANTF, GMSD, UNSA
# 
# 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.
# 
# The successive co-seismic displacements thus calculated are compiled in a cumulative table available at:
# ftp://igs-rf.ign.fr/pub/coseismic/IGS_coseismic.dat
# 
#__________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]_
#-----------------------------------------------------------------------------------------------------------------------------------------------------------
 ANTF  -70.420  -23.702 No    2024-07-19 01:50:48 7.3 Chile-Argentina Border R  -67.780  -23.050     279      -8.8    -2.4     3.2      -8.9    -2.4     3.1
 UNSA  -65.408  -24.727 Yes   2024-07-19 01:50:48 7.3 Chile-Argentina Border R  -67.780  -23.050     305      -0.9     1.4    -0.4      -0.8     1.3    -0.5
 AIRA  130.600   31.824 Yes   2024-08-08 07:42:55 7.0 Kyushu, Japan             131.530   31.720      89      29.9    -6.4    -8.0      27.7    -6.7    -5.2
 GMSD  131.016   30.556 No    2024-08-08 07:42:55 7.0 Kyushu, Japan             131.530   31.720     138      -0.9    -1.8    -1.0      -1.0    -1.7    -0.9