Early-est:     Fiji Islands Region    2026.04.01-06:08:28.39    q:A      mb:5.3    Mwp:5.7*    Mwpd:-    Td*T50Ex:0.0     fmamp_polarity:./hypo.1775023708747.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775023708747.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775023708747.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 [83]    Mwp: 5.7* [13]    Mwpd: 5.9Xinv [13]
Region: Fiji Islands Region
Origin Time: 2026.04.01-06:08:28.39 UTC
Hypocenter: lat: -21.72°  lon: -179.14°  [+/-7km]    depth: 599km  [+/-8km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 196   usedPhases: 133
minDist: 4.8°   maxDist: 175.5°   AzGap: 32°   2ndAzGap: 49°   atten: -1.65 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 160°
68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 336°   majorAxisPlunge: 24°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 197°   intermediateAxisPlunge: 59°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [59]    Td: 1.2s [10]    Td*T50Ex: 0.0 [10]    To: 1.8s [59]
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:
   0.0
   0.0
   0.0
Td*To:
     2.2
     2.2
     2.2
Mwp magnitude:
       5.7*
       5.7*
       5.7*
Hypocenter depth:
       599km
       599km
       599km
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.1775023708747.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 284°   dip: 38°   rake: -54°
Nodal Plane 2: strike: 62°   dip: 60°   rake: -115°
Quality: azimuthalGap: -1°   stationPolarityCount: 78   misfitWeightCount: 25.2   misfit: 0.16   stationDistributionRatio: 0.62   meanDistP: 29.2   meanDistT: 37.2   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775023708747.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.1775023708747.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 64°   dip: 53°   rake: -156°
Nodal Plane 2: strike: 319°   dip: 71°   rake: -39°
Quality: azimuthalGap: 32°   stationPolarityCount: 78   misfit: 0.27   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 18.22   fracAcc30degPref: 0.95   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775023708747.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775023708747
Event info last updated: 2026.04.01-07:07:01 UTC
Event first association/location: 2026.04.01-06:12:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA