Early-est:     South of Fiji Islands    2025.12.08-07:50:01.67    q:C      mb:4.1    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765180200563.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765180200563.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765180200563.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765180200563.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: 4.1 [15]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2025.12.08-07:50:01.67 UTC
Hypocenter: lat: -24.41°  lon: 179.98°  [+/-29km]    depth: 509km  [+/-30km]
Location Quality: qualityCode:  C     stdErr: 1.3s   assocPhases: 20   usedPhases: 17
minDist: 6.9°   maxDist: 157.3°   AzGap: 205°   2ndAzGap: 214°   atten: -1.23 [+/-0.32]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 29km   azMaxHorUnc: 79°
68%ConfEllipsoid:   semiMajorAxisLength: 43km   majorAxisAzimuth: 80°   majorAxisPlunge: 37°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 245°   intermediateAxisPlunge: 52°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [4]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 504km
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:
       509km
       509km
       509km
Slab depth at epicenter:
       504km
       -
       -
./hypo.1765180200563.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 16°   dip: 5°   rake: -126°
Nodal Plane 2: strike: 232°   dip: 86°   rake: -87°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 5.5   misfit: 0.07   stationDistributionRatio: 0.54   meanDistP: 46.7   meanDistT: 46.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765180200563.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 215°   stationPolarityCount: 16   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765180200563.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1765180200563.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1765180200563.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765180200563
Event info last updated: 2025.12.08-08:50:37 UTC
Event first association/location: 2025.12.08-07:58:36 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI