Early-est:     South of Fiji Islands    2025.12.12-12:09:37.24    q:B      mb:3.9    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765541377511.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765541377511.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765541377511.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765541377511.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: 3.9 [10]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2025.12.12-12:09:37.24 UTC
Hypocenter: lat: -23.46°  lon: -179.85°  [+/-15km]    depth: 526km  [+/-21km]
Location Quality: qualityCode:  B     stdErr: 0.5s   assocPhases: 14   usedPhases: 12
minDist: 6.0°   maxDist: 154.6°   AzGap: 154°   2ndAzGap: 214°   atten: -0.93 [+/-0.39]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 144°
68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 35°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 134°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.7Xs [3]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 522km
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:
       526km
       526km
       526km
Slab depth at epicenter:
       522km
       -
       -
./hypo.1765541377511.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 220°   dip: 32°   rake: 63°
Nodal Plane 2: strike: 71°   dip: 62°   rake: 106°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 2.5   misfit: 0.03   stationDistributionRatio: 0.53   meanDistP: 47.8   meanDistT: 40.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765541377511.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: 217°   stationPolarityCount: 10   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765541377511.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.1765541377511.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.1765541377511.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765541377511
Event info last updated: 2025.12.12-13:09:46 UTC
Event first association/location: 2025.12.12-12:19:48 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI