Early-est:     Loyalty Islands    2026.09.29-03:23:56.80    q:B      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790652229743.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790652229743.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790652229743.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* [37]    Mwp: 5.6X [2]    Mwpd: 5.9Xinv [2]
Region: Loyalty Islands
Origin Time: 2026.09.29-03:23:56.80 UTC
Hypocenter: lat: -20.96°  lon: 168.47°  [+/-40km]    depth: 15km  [+/-37km]
Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 115   usedPhases: 81
minDist: 0.7°   maxDist: 164.3°   AzGap: 77°   2ndAzGap: 92°   atten: -0.94 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 38km   maxHorUnc: 40km   azMaxHorUnc: 29°
68%ConfEllipsoid:   semiMajorAxisLength: 50km   majorAxisAzimuth: 212°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 47km   intermediateAxisAzimuth: 303°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 37km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [24]    Td: 3.1Xs [1]    Td*T50Ex: - [0]    To: 20.9s [23]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~20km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (20km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1790652229743.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 61°   dip: 29°   rake: 75°
Nodal Plane 2: strike: 257°   dip: 62°   rake: 98°
Quality: azimuthalGap: -1°   stationPolarityCount: 39   misfitWeightCount: 10.1   misfit: 0.21   stationDistributionRatio: 0.38   meanDistP: 46.0   meanDistT: 41.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790652229743.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.1790652229743.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 280°   dip: 88°   rake: -167°
Nodal Plane 2: strike: 190°   dip: 77°   rake: -2°
Quality: azimuthalGap: 76°   stationPolarityCount: 39   misfit: 0.32   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 36.12   fracAcc30degPref: 0.76   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790652229743.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790652229743
Event info last updated: 2026.09.29-04:22:00 UTC
Event first association/location: 2026.09.29-03:26:04 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA