Early-est:     Loyalty Islands    2026.09.25-23:39:42.22    q:A      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:2.6     fmamp_polarity:./hypo.1790379582215.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790379582215.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790379582215.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: 5.1* [40]    Mwp: 5.7X [3]    Mwpd: 6.1Xinv [1]
Region: Loyalty Islands
Origin Time: 2026.09.25-23:39:42.22 UTC
Hypocenter: lat: -21.15°  lon: 168.68°  [+/-11km]    depth: 9km  [+/-9km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 124   usedPhases: 76
minDist: 0.7°   maxDist: 164.3°   AzGap: 73°   2ndAzGap: 91°   atten: -1.16 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 8km   maxHorUnc: 11km   azMaxHorUnc: 37°
68%ConfEllipsoid:   semiMajorAxisLength: 14km   majorAxisAzimuth: 217°   majorAxisPlunge: 1°   semiIntermediateAxisLength: 10km   intermediateAxisAzimuth: 126°   intermediateAxisPlunge: 21°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [26]    Td: 5.2s [7]    Td*T50Ex: 2.6 [7]    To: 9.9s [21]
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:
   2.6
   2.6
   2.6
Td*To:
     51.5
     51.5
     51.5
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
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.1790379582215.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 122°   dip: 27°   rake: -160°
Nodal Plane 2: strike: 14°   dip: 81°   rake: -64°
Quality: azimuthalGap: -1°   stationPolarityCount: 37   misfitWeightCount: 8.4   misfit: 0.14   stationDistributionRatio: 0.44   meanDistP: 40.2   meanDistT: 46.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790379582215.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.1790379582215.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 109°   dip: 64°   rake: -152°
Nodal Plane 2: strike: 6°   dip: 65°   rake: -29°
Quality: azimuthalGap: 73°   stationPolarityCount: 36   misfit: 0.27   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 35.64   fracAcc30degPref: 0.59   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790379582215.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790379582215
Event info last updated: 2026.09.26-00:38:02 UTC
Event first association/location: 2026.09.25-23:45:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA