Early-est:     Fiji Islands Region    2025.01.25-16:08:51.63    q:B      mb:4.3    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: 4.3 [13]    Mwp: - [0]    Mwpd: - [0] Region: Fiji Islands Region Origin Time: 2025.01.25-16:08:51.63 UTC Hypocenter: lat: -20.05°  lon: -177.64°  [+/-29km]    depth: 432km  [+/-42km] Location Quality: qualityCode:  B     stdErr: 0.5s   assocPhases: 36   usedPhases: 16 minDist: 4.7°   maxDist: 146.8°   AzGap: 111°   2ndAzGap: 141°   atten: -1.15 [+/-0.24] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 29km   azMaxHorUnc: 32° 68%ConfEllipsoid:   semiMajorAxisLength: 51km   majorAxisAzimuth: 39°   majorAxisPlunge: 51°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 160°   intermediateAxisPlunge: 23°   semiMinorAxisLength: 17km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.6s [5] Closest plate boundaries:    Niuafo'ou - Australia [oceanic transform fault]: distance: ~150km    Tonga - Australia [oceanic transform fault]: distance: ~150km    Tonga - Niuafo'ou [continental convergent boundary]: distance: ~190km    Tonga / Pacific [subduction zone]: distance: ~430km Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 469km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (430km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        432km        432km        432km Slab depth at epicenter:        469km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 208°   dip: 34°   rake: 0° Nodal Plane 2: strike: 118°   dip: 90°   rake: 124° Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 4.8   misfit: 0.05   stationDistributionRatio: 0.37   meanDistP: 45.9   meanDistT: 39.2   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
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: 160°   stationPolarityCount: 14   misfit: 0.99   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 20.62   fracAcc30degPref: 0.00   qualityCode: E 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: 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
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

Event ID: smi:KOERI/ee/event/1737821331633
Event info last updated: 2025.01.25-17:09:02 UTC
Event first association/location: 2025.01.25-16:35:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI