Early-est:     Chile - Argentina Border Region    2025.11.09-16:00:33.05    q:A      mb:4.7    Mwp:-    Mwpd:-    Td*T50Ex:0.7     fmamp_polarity:./hypo.1762704033509.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1762704033509.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1762704033509.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1762704033509.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: 4.7 [39]    Mwp: - [0]    Mwpd: - [0]
Region: Chile - Argentina Border Region
Origin Time: 2025.11.09-16:00:33.05 UTC
Hypocenter: lat: -24.22°  lon: -67.06°  [+/-6km]    depth: 174km  [+/-8km]
Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 83   usedPhases: 56
minDist: 1.6°   maxDist: 155.1°   AzGap: 58°   2ndAzGap: 85°   atten: -1.06 [+/-0.18]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 5km   maxHorUnc: 6km   azMaxHorUnc: 93°
68%ConfEllipsoid:   semiMajorAxisLength: 8km   majorAxisAzimuth: 75°   majorAxisPlunge: 80°   semiIntermediateAxisLength: 7km   intermediateAxisAzimuth: 275°   intermediateAxisPlunge: 10°   semiMinorAxisLength: 6km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.3 [25]    Td: 2.7s [4]    Td*T50Ex: 0.7 [4]    To: 1.0s [14]
Closest plate boundaries:
Subduction geometry:    Zone: South America    Slab depth at epicenter: 158km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   0.7
   0.7
   0.7
Td*To:
     2.7
     2.7
     2.7
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       174km
       174km
       174km
Slab depth at epicenter:
       158km
       -
       -
./hypo.1762704033509.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 132°   dip: 54°   rake: -142°
Nodal Plane 2: strike: 17°   dip: 60°   rake: -43°
Quality: azimuthalGap: -1°   stationPolarityCount: 48   misfitWeightCount: 11.9   misfit: 0.18   stationDistributionRatio: 0.51   meanDistP: 33.5   meanDistT: 35.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1762704033509.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 295°   dip: 72°   rake: -174°
Nodal Plane 2: strike: 203°   dip: 85°   rake: -18°
Quality: azimuthalGap: 86°   stationPolarityCount: 48   misfit: 0.30   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 40.57   fracAcc30degPref: 0.65   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1762704033509.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.1762704033509.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.1762704033509.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1762704033509
Event info last updated: 2025.11.09-17:00:48 UTC
Event first association/location: 2025.11.09-16:06:31 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI