Early-est:     South of Fiji Islands    2026.06.21-06:04:28.11    q:A      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1782021869605.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1782021869605.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1782021869605.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: 4.9* [40]    Mwp: - [0]    Mwpd: - [0]
Region: South of Fiji Islands
Origin Time: 2026.06.21-06:04:28.11 UTC
Hypocenter: lat: -26.34°  lon: 178.61°  [+/-16km]    depth: 582km  [+/-18km]
Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 83   usedPhases: 60
minDist: 4.2°   maxDist: 156.7°   AzGap: 97°   2ndAzGap: 145°   atten: -1.17 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 16km   azMaxHorUnc: 20°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 20°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 224°   intermediateAxisPlunge: 87°   semiMinorAxisLength: 11km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [31]    Td: 0.8Xs [1]    Td*T50Ex: - [0]    To: 1.4s [31]
Closest plate boundaries:
Subduction geometry:    Zone: Kermadec-Tonga: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
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:
       582km
       582km
       582km
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.1782021869605.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 320°   dip: 46°   rake: 166°
Nodal Plane 2: strike: 59°   dip: 80°   rake: 44°
Quality: azimuthalGap: -1°   stationPolarityCount: 36   misfitWeightCount: 14.3   misfit: 0.15   stationDistributionRatio: 0.54   meanDistP: 41.7   meanDistT: 35.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1782021869605.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.1782021869605.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 315°   dip: 47°   rake: 169°
Nodal Plane 2: strike: 53°   dip: 82°   rake: 44°
Quality: azimuthalGap: 68°   stationPolarityCount: 36   misfit: 0.18   stationDistributionRatio: 0.55   rmsAngDiffAccPref: 28.71   fracAcc30degPref: 0.72   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1782021869605.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1782021869605
Event info last updated: 2026.06.21-07:03:00 UTC
Event first association/location: 2026.06.21-06:08:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA