Early-est:     Fiji Islands Region    2025.12.16-07:32:59.90    q:A      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765870379958.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765870379958.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765870379958.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765870379958.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: 4.6 [26]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2025.12.16-07:32:59.90 UTC
Hypocenter: lat: -17.94°  lon: -177.78°  [+/-15km]    depth: 626km  [+/-18km]
Location Quality: qualityCode:  A     stdErr: 1.0s   assocPhases: 68   usedPhases: 39
minDist: 4.0°   maxDist: 151.6°   AzGap: 135°   2ndAzGap: 172°   atten: -1.24 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 124°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 98°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 315°   intermediateAxisPlunge: 29°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [19]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [14]
Closest plate boundaries:
   Niuafo'ou - Australia [continental rift boundary]: distance: ~140km
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 515km
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:
       626km
       626km
       626km
Slab depth at epicenter:
       515km
       -
       -
./hypo.1765870379958.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 355°   dip: 15°   rake: 93°
Nodal Plane 2: strike: 172°   dip: 75°   rake: 89°
Quality: azimuthalGap: -1°   stationPolarityCount: 35   misfitWeightCount: 8.1   misfit: 0.17   stationDistributionRatio: 0.45   meanDistP: 32.8   meanDistT: 38.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765870379958.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 187°   dip: 65°   rake: 117°
Nodal Plane 2: strike: 316°   dip: 36°   rake: 45°
Quality: azimuthalGap: 79°   stationPolarityCount: 35   misfit: 0.22   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 37.18   fracAcc30degPref: 0.62   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765870379958.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.1765870379958.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.1765870379958.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765870379958
Event info last updated: 2025.12.16-08:33:04 UTC
Event first association/location: 2025.12.16-07:39:03 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI