Early-est:     Fiji Islands Region    2026.06.19-15:28:54.13    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781882932940.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781882932940.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781882932940.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: 4.6* [38]    Mwp: 5.5X [1]    Mwpd: 5.7Xinv [1]
Region: Fiji Islands Region
Origin Time: 2026.06.19-15:28:54.13 UTC
Hypocenter: lat: -21.41°  lon: -177.82°  [+/-13km]    depth: 459km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 99   usedPhases: 62
minDist: 5.3°   maxDist: 157.3°   AzGap: 134°   2ndAzGap: 143°   atten: -1.11 [+/-0.25]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 16°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 208°   majorAxisPlunge: 32°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 327°   intermediateAxisPlunge: 37°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.1 [22]    Td: 0.8Xs [1]    Td*T50Ex: - [0]    To: 1.5s [21]
Closest plate boundaries:
   Tonga - Australia [oceanic spreading ridge]: distance: ~140km
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:
       459km
       459km
       459km
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.1781882932940.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 146°   dip: 49°   rake: 156°
Nodal Plane 2: strike: 252°   dip: 72°   rake: 43°
Quality: azimuthalGap: -1°   stationPolarityCount: 36   misfitWeightCount: 8.3   misfit: 0.06   stationDistributionRatio: 0.41   meanDistP: 43.2   meanDistT: 48.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781882932940.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.1781882932940.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 142°   dip: 50°   rake: 156°
Nodal Plane 2: strike: 248°   dip: 72°   rake: 43°
Quality: azimuthalGap: 81°   stationPolarityCount: 36   misfit: 0.16   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 9.16   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781882932940.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781882932940
Event info last updated: 2026.06.19-16:27:00 UTC
Event first association/location: 2026.06.19-15:40:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA