Early-est:     Fiji Islands Region    2026.10.08-10:07:30.17    q:B      mb:4.7    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791454050300.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791454050300.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791454050300.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791454050300.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: 4.7 [24]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.10.08-10:07:30.17 UTC
Hypocenter: lat: -17.75°  lon: -178.57°  [+/-19km]    depth: 609km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 59   usedPhases: 54
minDist: 3.2°   maxDist: 150.5°   AzGap: 75°   2ndAzGap: 139°   atten: -1.78 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 19km   azMaxHorUnc: 144°
68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 144°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 3°   intermediateAxisPlunge: 85°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [16]    Td: 1.8Xs [2]    Td*T50Ex: - [0]    To: 1.0s [12]
Closest plate boundaries:
   Niuafo'ou - Australia [continental transform fault]: distance: ~190km
Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 559km
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:
       609km
       609km
       609km
Slab depth at epicenter:
       559km
       -
       -
./hypo.1791454050300.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 91°   dip: 53°   rake: -176°
Nodal Plane 2: strike: 359°   dip: 87°   rake: -37°
Quality: azimuthalGap: -1°   stationPolarityCount: 49   misfitWeightCount: 8.8   misfit: 0.13   stationDistributionRatio: 0.50   meanDistP: 34.3   meanDistT: 35.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791454050300.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 247°   dip: 86°   rake: 167°
Nodal Plane 2: strike: 338°   dip: 77°   rake: 4°
Quality: azimuthalGap: 110°   stationPolarityCount: 49   misfit: 0.41   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 30.96   fracAcc30degPref: 0.49   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791454050300.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.1791454050300.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.1791454050300.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791454050300
Event info last updated: 2026.10.08-11:07:37 UTC
Event first association/location: 2026.10.08-10:13:42 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI