Early-est:     Near Coast of Northern Chile    2025.12.16-06:10:08.58    q:C      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765865411245.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765865411245.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765865411245.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765865411245.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: 4.5 [6]    Mwp: - [0]    Mwpd: - [0]
Region: Near Coast of Northern Chile
Origin Time: 2025.12.16-06:10:08.58 UTC
Hypocenter: lat: -27.44°  lon: -70.03°  [+/-23km]    depth: 20km  [+/-16km]
Location Quality: qualityCode:  C     stdErr: 3.3s   assocPhases: 14   usedPhases: 11
minDist: 1.7°   maxDist: 146.8°   AzGap: 115°   2ndAzGap: 160°   atten: -3.52 [+/-0.64]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 18km   maxHorUnc: 23km   azMaxHorUnc: 82°
68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 261°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 22km   intermediateAxisAzimuth: 171°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 1.6 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~180km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 68km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (180km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       68km
       -
       -
./hypo.1765865411245.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 131°   dip: 65°   rake: 17°
Nodal Plane 2: strike: 34°   dip: 74°   rake: 154°
Quality: azimuthalGap: -1°   stationPolarityCount: 8   misfitWeightCount: 5.3   misfit: 0.00   stationDistributionRatio: 0.37   meanDistP: 35.6   meanDistT: 42.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765865411245.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 37°   dip: 65°   rake: 140°
Nodal Plane 2: strike: 146°   dip: 54°   rake: 32°
Quality: azimuthalGap: 122°   stationPolarityCount: 8   misfit: 0.30   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 42.81   fracAcc30degPref: 0.38   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765865411245.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.1765865411245.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.1765865411245.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765865411245
Event info last updated: 2025.12.16-07:10:41 UTC
Event first association/location: 2025.12.16-06:12:40 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI