Early-est:     Fiji Islands Region    2026.08.17-00:08:03.90    q:B      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786925287084.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786925287084.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786925287084.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: 5.2* [38]    Mwp: - [0]    Mwpd: - [0]
Region: Fiji Islands Region
Origin Time: 2026.08.17-00:08:03.90 UTC
Hypocenter: lat: -17.75°  lon: -178.31°  [+/-24km]    depth: 521km  [+/-31km]
Location Quality: qualityCode:  B     stdErr: 1.8s   assocPhases: 107   usedPhases: 76
minDist: 3.5°   maxDist: 162.4°   AzGap: 90°   2ndAzGap: 142°   atten: -1.61 [+/-0.30]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 20km   maxHorUnc: 24km   azMaxHorUnc: 17°
68%ConfEllipsoid:   semiMajorAxisLength: 35km   majorAxisAzimuth: 203°   majorAxisPlunge: 51°   semiIntermediateAxisLength: 26km   intermediateAxisAzimuth: 342°   intermediateAxisPlunge: 32°   semiMinorAxisLength: 24km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [30]    Td: 1.1Xs [3]    Td*T50Ex: - [0]    To: 1.4s [30]
Closest plate boundaries:
   Niuafo'ou - Australia [continental transform fault]: distance: ~170km
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:
       521km
       521km
       521km
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.1786925287084.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 248°   dip: 9°   rake: -39°
Nodal Plane 2: strike: 17°   dip: 85°   rake: -97°
Quality: azimuthalGap: -1°   stationPolarityCount: 39   misfitWeightCount: 10.1   misfit: 0.09   stationDistributionRatio: 0.58   meanDistP: 32.5   meanDistT: 46.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786925287084.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.1786925287084.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 21°   dip: 81°   rake: -123°
Nodal Plane 2: strike: 278°   dip: 35°   rake: -16°
Quality: azimuthalGap: 101°   stationPolarityCount: 39   misfit: 0.17   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 30.58   fracAcc30degPref: 0.70   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786925287084.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786925287084
Event info last updated: 2026.08.17-01:07:00 UTC
Event first association/location: 2026.08.17-00:12:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA