Early-est:     Northern Chile    2025.11.09-23:44:26.12    q:B      mb:4.0    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1762731866566.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1762731866566.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1762731866566.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1762731866566.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: 4.0 [8]    Mwp: - [0]    Mwpd: - [0]
Region: Northern Chile
Origin Time: 2025.11.09-23:44:26.12 UTC
Hypocenter: lat: -24.93°  lon: -69.31°  [+/-14km]    depth: 137km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 21   usedPhases: 15
minDist: 0.3°   maxDist: 148.4°   AzGap: 127°   2ndAzGap: 148°   atten: -1.64 [+/-0.49]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 120°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 299°   majorAxisPlunge: 20°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 154°   intermediateAxisPlunge: 66°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.7 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.6Xs [1]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~220km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 78km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (220km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       137km
       137km
       137km
Slab depth at epicenter:
       78km
       -
       -
./hypo.1762731866566.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 69°   dip: 33°   rake: 88°
Nodal Plane 2: strike: 252°   dip: 57°   rake: 91°
Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 7.0   misfit: 0.09   stationDistributionRatio: 0.55   meanDistP: 30.9   meanDistT: 34.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1762731866566.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 244°   dip: 58°   rake: 84°
Nodal Plane 2: strike: 76°   dip: 32°   rake: 100°
Quality: azimuthalGap: 146°   stationPolarityCount: 14   misfit: 0.23   stationDistributionRatio: 0.55   rmsAngDiffAccPref: 39.23   fracAcc30degPref: 0.45   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1762731866566.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.1762731866566.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.1762731866566.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1762731866566
Event info last updated: 2025.11.10-00:45:07 UTC
Event first association/location: 2025.11.09-23:49:55 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI