[IGSSTATION-8958] Possible co-seismic displacements: FALK, MAC1, PARC, RGDG, RIO2

[Paul Rebischung]

# Author : Paul Rebischung
# Contact : igs-rf at ign.fr
# Subject : Possible co-seismic displacements: FALK, MAC1, PARC, RGDG, RIO2
# 
# 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 (IGb20),
# 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]_
#-----------------------------------------------------------------------------------------------------------------------------------------------------------
 MAC1  158.936  -54.500 Yes   2025-04-29 14:53:36 6.8 Macquarie Island Region   155.680  -54.330     211      -2.5     0.6     0.9      -2.5     0.6     0.9
 FALK  -57.874  -51.694 Yes   2025-05-02 12:58:26 7.5 Drake Passage             -68.210  -56.780     876      -1.5    -1.3     0.4      -1.5    -1.3     0.4
 PARC  -70.880  -53.137 Yes   2025-05-02 12:58:26 7.5 Drake Passage             -68.210  -56.780     439      -0.5    -0.9    -1.1      -0.5    -1.0    -1.2
 RGDG  -67.752  -53.786 No    2025-05-02 12:58:26 7.5 Drake Passage             -68.210  -56.780     334      -2.9    -5.9    -0.2      -3.0    -6.1    -0.2
 RIO2  -67.751  -53.785 Yes   2025-05-02 12:58:26 7.5 Drake Passage             -68.210  -56.780     334      -2.9    -5.9    -0.2      -3.0    -6.1    -0.2