Early-est:     South of Fiji Islands    2025.12.07-04:33:51.21    q:B      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765082031476.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765082031476.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765082031476.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765082031476.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 [22]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2025.12.07-04:33:51.21 UTC
Hypocenter: lat: -23.56°  lon: -179.75°  [+/-14km]    depth: 545km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 77   usedPhases: 47
minDist: 6.2°   maxDist: 158.0°   AzGap: 79°   2ndAzGap: 114°   atten: -1.03 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 14km   azMaxHorUnc: 64°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 64°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 264°   intermediateAxisPlunge: 75°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.3s [8]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 508km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       545km
       545km
       545km
Slab depth at epicenter:
       508km
       -
       -
./hypo.1765082031476.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 296°   dip: 35°   rake: 61°
Nodal Plane 2: strike: 150°   dip: 60°   rake: 109°
Quality: azimuthalGap: -1°   stationPolarityCount: 42   misfitWeightCount: 8.8   misfit: 0.07   stationDistributionRatio: 0.43   meanDistP: 36.0   meanDistT: 30.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765082031476.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 195°   dip: 81°   rake: 170°
Nodal Plane 2: strike: 286°   dip: 80°   rake: 9°
Quality: azimuthalGap: 62°   stationPolarityCount: 42   misfit: 0.37   stationDistributionRatio: 0.55   rmsAngDiffAccPref: 16.84   fracAcc30degPref: 1.00   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765082031476.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.1765082031476.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.1765082031476.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765082031476
Event info last updated: 2025.12.07-05:34:02 UTC
Event first association/location: 2025.12.07-04:46:20 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI