Early-est:     Fiji Islands Region    2026.03.31-17:09:05.56    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774976944310.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774976944310.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774976944310.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* [19]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.03.31-17:09:05.56 UTC
Hypocenter: lat: -20.94°  lon: -178.33°  [+/-15km]    depth: 517km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 59   usedPhases: 31
minDist: 4.7°   maxDist: 153.9°   AzGap: 175°   2ndAzGap: 225°   atten: -1.18 [+/-0.44]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 83°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 84°   majorAxisPlunge: 6°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 180°   intermediateAxisPlunge: 44°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.1s [13]
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:
       517km
       517km
       517km
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.1774976944310.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 2°   dip: 23°   rake: 143°
Nodal Plane 2: strike: 127°   dip: 76°   rake: 71°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 4.6   misfit: 0.17   stationDistributionRatio: 0.49   meanDistP: 54.7   meanDistT: 53.8   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774976944310.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.1774976944310.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: 162°   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.1774976944310.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774976944310
Event info last updated: 2026.03.31-18:08:00 UTC
Event first association/location: 2026.03.31-17:19:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA