Early-est:     Chile - Argentina Border Region    2025.01.31-22:19:15.50    q:B      mb:4.4    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738361954909.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738361954909.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738361954909.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738361954909.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.4 [5]    Mwp: - [0]    Mwpd: - [0]
Region: Chile - Argentina Border Region
Origin Time: 2025.01.31-22:19:15.50 UTC
Hypocenter: lat: -29.21°  lon: -69.71°  [+/-35km]    depth: 190km  [+/-25km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 19   usedPhases: 15
minDist: 0.9°   maxDist: 151.9°   AzGap: 68°   2ndAzGap: 118°   atten: -1.78 [+/-0.39]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 35km   azMaxHorUnc: 102°
68%ConfEllipsoid:   semiMajorAxisLength: 44km   majorAxisAzimuth: 282°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 24km   intermediateAxisAzimuth: 96°   intermediateAxisPlunge: 78°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.6 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~260km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 82km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (260km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       190km
       190km
       190km
Slab depth at epicenter:
       82km
       -
       -
./hypo.1738361954909.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 4°   dip: 38°   rake: -69°
Nodal Plane 2: strike: 158°   dip: 55°   rake: -105°
Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 7.3   misfit: 0.09   stationDistributionRatio: 0.38   meanDistP: 28.5   meanDistT: 35.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738361954909.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 161°   dip: 56°   rake: -112°
Nodal Plane 2: strike: 17°   dip: 40°   rake: -61°
Quality: azimuthalGap: 146°   stationPolarityCount: 14   misfit: 0.22   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 45.62   fracAcc30degPref: 0.36   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738361954909.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: 0°
Nodal Plane 2: strike: 270°   dip: 90°   rake: 90°
Quality: azimuthalGap: -1°   stationPolarityCount: 0   misfitWeightCount: -1.0   misfit: -1.00   stationDistributionRatio: -1.00   meanDistP: -1.0   meanDistT: -1.0   qualityCode: X
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1738361954909.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: 0°
Nodal Plane 2: strike: 270°   dip: 90°   rake: 90°
Quality: azimuthalGap: -1°   stationPolarityCount: 0   misfitWeightCount: -1.0   misfit: -1.00   stationDistributionRatio: -1.00   meanDistP: -1.0   meanDistT: -1.0   qualityCode: X
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp
./hypo.1738361954909.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738361954909
Event info last updated: 2025.01.31-23:20:02 UTC
Event first association/location: 2025.01.31-22:21:04 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI