Early-est:     Fiji Islands Region    2026.04.03-00:49:09.47    q:C      mb:4.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775177353965.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775177353965.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775177353965.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: 4.2* [5]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.04.03-00:49:09.47 UTC
Hypocenter: lat: -17.70°  lon: -177.83°  [+/-34km]    depth: 577km  [+/-30km]
Location Quality: qualityCode:  C     stdErr: 2.0s   assocPhases: 38   usedPhases: 24
minDist: 3.9°   maxDist: 150.6°   AzGap: 184°   2ndAzGap: 203°   atten: -1.65 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 16km   maxHorUnc: 34km   azMaxHorUnc: 84°
68%ConfEllipsoid:   semiMajorAxisLength: 42km   majorAxisAzimuth: 264°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 30km   intermediateAxisAzimuth: 155°   intermediateAxisPlunge: 79°   semiMinorAxisLength: 20km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: - [0]    Td: 8.2Xs [1]    Td*T50Ex: - [0]    To: -s [0]
Closest plate boundaries:
   Niuafo'ou - Australia [continental rift boundary]: distance: ~130km
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:
       577km
       577km
       577km
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.1775177353965.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 140°   dip: 54°   rake: -176°
Nodal Plane 2: strike: 47°   dip: 87°   rake: -36°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 4.3   misfit: 0.14   stationDistributionRatio: 0.56   meanDistP: 46.6   meanDistT: 52.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775177353965.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.1775177353965.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 130°   dip: 88°   rake: -113°
Nodal Plane 2: strike: 35°   dip: 23°   rake: -5°
Quality: azimuthalGap: 108°   stationPolarityCount: 10   misfit: 0.41   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 49.65   fracAcc30degPref: 0.26   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775177353965.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775177353965
Event info last updated: 2026.04.03-01:48:00 UTC
Event first association/location: 2026.04.03-00:55:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA