Early-est:     Fiji Islands Region    2026.04.03-14:54:21.53    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775228061092.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775228061092.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775228061092.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* [22]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.04.03-14:54:21.53 UTC
Hypocenter: lat: -18.18°  lon: -178.24°  [+/-21km]    depth: 580km  [+/-21km]
Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 50   usedPhases: 27
minDist: 3.6°   maxDist: 149.6°   AzGap: 96°   2ndAzGap: 138°   atten: -0.88 [+/-0.37]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 21km   azMaxHorUnc: 70°
68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 69°   majorAxisPlunge: 29°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 280°   intermediateAxisPlunge: 57°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [8]
Closest plate boundaries:
   Niuafo'ou - Australia [oceanic spreading ridge]: distance: ~190km
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:
       580km
       580km
       580km
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.1775228061092.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 105°   dip: 27°   rake: 9°
Nodal Plane 2: strike: 8°   dip: 86°   rake: 117°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 7.1   misfit: 0.07   stationDistributionRatio: 0.49   meanDistP: 42.2   meanDistT: 43.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775228061092.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.1775228061092.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: 152°   stationPolarityCount: 22   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775228061092.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775228061092
Event info last updated: 2026.04.03-15:53:01 UTC
Event first association/location: 2026.04.03-15:00:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA