Early-est:     Loyalty Islands    2026.09.26-05:50:51.03    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790401851462.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790401851462.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790401851462.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* [11]    Mwp: 4.9X [3]    Mwpd: 5.7Xinv [1]
Region: Loyalty Islands
Origin Time: 2026.09.26-05:50:51.03 UTC
Hypocenter: lat: -20.94°  lon: 168.54°  [+/-44km]    depth: 23km  [+/-32km]
Location Quality: qualityCode:  C     stdErr: 1.9s   assocPhases: 41   usedPhases: 33
minDist: 0.7°   maxDist: 159.2°   AzGap: 148°   2ndAzGap: 189°   atten: -1.95 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 29km   maxHorUnc: 44km   azMaxHorUnc: 92°
68%ConfEllipsoid:   semiMajorAxisLength: 55km   majorAxisAzimuth: 272°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 36km   intermediateAxisAzimuth: 4°   intermediateAxisPlunge: 14°   semiMinorAxisLength: 31km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [7]    Td: 6.6Xs [1]    Td*T50Ex: - [0]    To: 13.3s [7]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~10km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (10km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       23km
       23km
       23km
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.1790401851462.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 7°   dip: 24°   rake: -93°
Nodal Plane 2: strike: 190°   dip: 66°   rake: -89°
Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 3.9   misfit: 0.03   stationDistributionRatio: 0.59   meanDistP: 49.2   meanDistT: 53.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790401851462.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.1790401851462.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 300°   dip: 54°   rake: -124°
Nodal Plane 2: strike: 168°   dip: 48°   rake: -53°
Quality: azimuthalGap: 139°   stationPolarityCount: 14   misfit: 0.11   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 39.46   fracAcc30degPref: 0.38   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790401851462.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790401851462
Event info last updated: 2026.09.26-06:49:00 UTC
Event first association/location: 2026.09.26-05:53:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA