Early-est:     Fiji Islands Region    2025.12.07-02:06:47.71    q:C      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 4.6 [17]    Mwp: - [0]    Mwpd: - [0] Region: Fiji Islands Region Origin Time: 2025.12.07-02:06:47.71 UTC Hypocenter: lat: -17.05°  lon: -177.08°  [+/-18km]    depth: 165km  [+/-31km] Location Quality: qualityCode:  C     stdErr: 1.4s   assocPhases: 33   usedPhases: 31 minDist: 16.3°   maxDist: 151.1°   AzGap: 141°   2ndAzGap: 198°   atten: -0.97 [+/-0.40] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 18km   azMaxHorUnc: 41° 68%ConfEllipsoid:   semiMajorAxisLength: 36km   majorAxisAzimuth: 221°   majorAxisPlunge: 59°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 129°   intermediateAxisPlunge: 1°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [8]    Td: 3.7Xs [2]    Td*T50Ex: - [0]    To: 2.2s [6] Closest plate boundaries:    Niuafo'ou - Australia [continental transform fault]: distance: ~30km    Futuna - Australia [continental transform fault]: distance: ~170km    Niuafo'ou - Futuna [continental rift boundary]: distance: ~170km Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 402km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  no  YES (30km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        165km        165km        165km Slab depth at epicenter:        402km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 298°   dip: 25°   rake: -38° Nodal Plane 2: strike: 64°   dip: 75°   rake: -110° Quality: azimuthalGap: -1°   stationPolarityCount: 30   misfitWeightCount: 7.0   misfit: 0.08   stationDistributionRatio: 0.44   meanDistP: 34.7   meanDistT: 38.0   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH): Nodal Plane 1: strike: 211°   dip: 73°   rake: 178° Nodal Plane 2: strike: 301°   dip: 88°   rake: 17° Quality: azimuthalGap: 141°   stationPolarityCount: 30   misfit: 0.18   stationDistributionRatio: 0.57   rmsAngDiffAccPref: 11.32   fracAcc30degPref: 1.00   qualityCode: B Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
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
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

Event ID: smi:KOERI/ee/event/1765073213627
Event info last updated: 2025.12.07-03:07:02 UTC
Event first association/location: 2025.12.07-02:20:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI