Early-est:     Fiji Islands Region    2026.08.09-01:09:19.70    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786237759357.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786237759357.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786237759357.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* [15]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.08.09-01:09:19.70 UTC
Hypocenter: lat: -17.78°  lon: -178.40°  [+/-39km]    depth: 580km  [+/-26km]
Location Quality: qualityCode:  C     stdErr: 0.9s   assocPhases: 31   usedPhases: 20
minDist: 3.4°   maxDist: 145.0°   AzGap: 178°   2ndAzGap: 187°   atten: -1.49 [+/-0.50]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 25km   maxHorUnc: 39km   azMaxHorUnc: 166°
68%ConfEllipsoid:   semiMajorAxisLength: 49km   majorAxisAzimuth: 346°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 31km   intermediateAxisAzimuth: 255°   intermediateAxisPlunge: 9°   semiMinorAxisLength: 26km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.0s [8]
Closest plate boundaries:
   Niuafo'ou - Australia [continental transform fault]: distance: ~180km
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.1786237759357.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 153°   dip: 24°   rake: -166°
Nodal Plane 2: strike: 50°   dip: 84°   rake: -67°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 3.4   misfit: 0.14   stationDistributionRatio: 0.36   meanDistP: 51.9   meanDistT: 55.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786237759357.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.1786237759357.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 359°   dip: 39°   rake: -131°
Nodal Plane 2: strike: 227°   dip: 62°   rake: -62°
Quality: azimuthalGap: 140°   stationPolarityCount: 15   misfit: 0.32   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 40.55   fracAcc30degPref: 0.40   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786237759357.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786237759357
Event info last updated: 2026.08.09-02:08:00 UTC
Event first association/location: 2026.08.09-01:21:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA