Early-est:     Fiji Islands Region    2025.12.11-22:08:08.84    q:A      mb:5.1    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765490888987.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765490888987.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765490888987.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765490888987.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: 5.1 [74]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2025.12.11-22:08:08.84 UTC
Hypocenter: lat: -18.20°  lon: -178.10°  [+/-14km]    depth: 573km  [+/-18km]
Location Quality: qualityCode:  A     stdErr: 1.0s   assocPhases: 174   usedPhases: 138
minDist: 3.7°   maxDist: 174.3°   AzGap: 38°   2ndAzGap: 42°   atten: -0.85 [+/-0.18]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 102°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 114°   majorAxisPlunge: 56°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 270°   intermediateAxisPlunge: 32°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [53]    Td: 3.9Xs [2]    Td*T50Ex: - [0]    To: 1.1s [46]
Closest plate boundaries:
   Niuafo'ou - Australia [oceanic spreading ridge]: distance: ~170km
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 527km
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:
       573km
       573km
       573km
Slab depth at epicenter:
       527km
       -
       -
./hypo.1765490888987.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 328°   dip: 39°   rake: 67°
Nodal Plane 2: strike: 176°   dip: 55°   rake: 107°
Quality: azimuthalGap: -1°   stationPolarityCount: 124   misfitWeightCount: 31.1   misfit: 0.27   stationDistributionRatio: 0.54   meanDistP: 35.3   meanDistT: 36.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765490888987.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 206°   dip: 70°   rake: -174°
Nodal Plane 2: strike: 114°   dip: 84°   rake: -20°
Quality: azimuthalGap: 41°   stationPolarityCount: 124   misfit: 0.35   stationDistributionRatio: 0.58   rmsAngDiffAccPref: 17.67   fracAcc30degPref: 0.96   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765490888987.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.1765490888987.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.1765490888987.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765490888987
Event info last updated: 2025.12.11-23:09:06 UTC
Event first association/location: 2025.12.11-22:12:42 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI