Early-est:     Fiji Islands Region    2025.01.28-11:24:40.42    q:A      mb:4.7    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: 4.7 [30]    Mwp: - [0]    Mwpd: - [0] Region: Fiji Islands Region Origin Time: 2025.01.28-11:24:40.42 UTC Hypocenter: lat: -19.68°  lon: -177.75°  [+/-15km]    depth: 573km  [+/-22km] Location Quality: qualityCode:  A     stdErr: 1.0s   assocPhases: 57   usedPhases: 32 minDist: 4.4°   maxDist: 162.8°   AzGap: 70°   2ndAzGap: 102°   atten: -1.59 [+/-0.23] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 91° 68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 76°   majorAxisPlunge: 59°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 286°   intermediateAxisPlunge: 27°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [17]    Td: 1.1Xs [1]    Td*T50Ex: - [0]    To: 1.1s [11] Closest plate boundaries:    Niuafo'ou - Australia [oceanic transform fault]: distance: ~140km    Tonga - Australia [oceanic transform fault]: distance: ~170km    Tonga - Niuafo'ou [continental convergent boundary]: distance: ~190km    Tonga / Pacific [subduction zone]: distance: ~460km Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 491km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (460km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        573km        573km        573km Slab depth at epicenter:        491km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 238°   dip: 53°   rake: -148° Nodal Plane 2: strike: 128°   dip: 65°   rake: -41° Quality: azimuthalGap: -1°   stationPolarityCount: 32   misfitWeightCount: 11.5   misfit: 0.16   stationDistributionRatio: 0.52   meanDistP: 56.1   meanDistT: 31.5   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 308°   dip: 32°   rake: -34° Nodal Plane 2: strike: 68°   dip: 73°   rake: -117° Quality: azimuthalGap: 102°   stationPolarityCount: 32   misfit: 0.37   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 38.74   fracAcc30degPref: 0.58   qualityCode: D 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/1738063479861
Event info last updated: 2025.01.28-12:24:47 UTC
Event first association/location: 2025.01.28-11:28:44 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI