Early-est:     Fiji Islands Region    2026.03.31-12:43:58.14    q:C      mb:5.3*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774961038099.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774961038099.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774961038099.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 5.3* [4]    Mwp: 5.2X [1]    Mwpd: 6.1Xinv [1]
Region: Fiji Islands Region
Origin Time: 2026.03.31-12:43:58.14 UTC
Hypocenter: lat: -14.74°  lon: -178.75°  [+/-22km]    depth: 9km  [+/-14km]
Location Quality: qualityCode:  C     stdErr: 1.0s   assocPhases: 10   usedPhases: 7
minDist: 6.8°   maxDist: 145.9°   AzGap: 153°   2ndAzGap: 245°   atten: -1.25 [+/-0.94]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 22km   azMaxHorUnc: 178°
68%ConfEllipsoid:   semiMajorAxisLength: 27km   majorAxisAzimuth: 178°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 70°   intermediateAxisPlunge: 67°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 1.1 [5]    Td: 0.4Xs [1]    Td*T50Ex: - [0]    To: 39.2s [5]
Closest plate boundaries:
   Futuna - Pacific [oceanic transform fault]: distance: ~40km
   Futuna - Australia [continental transform fault]: distance: ~70km
   Pacific - Australia [oceanic transform fault]: distance: ~110km
   Balmoral Reef - Australia [continental transform fault]: distance: ~140km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 YES (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1774961038099.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (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/_polarity
./hypo.1774961038099.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1774961038099.mech.fmamp_polarity_waveform.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: 104°   stationPolarityCount: 4   misfit: 0.99   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 40.22   fracAcc30degPref: 0.00   qualityCode: F
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774961038099.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774961038099
Event info last updated: 2026.03.31-13:42:02 UTC
Event first association/location: 2026.03.31-12:58:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA