Early-est:     Loyalty Islands    2026.09.26-15:01:39.58    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790434911556.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790434911556.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790434911556.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: 4.8* [12]    Mwp: 5.2X [1]    Mwpd: - [0]
Region: Loyalty Islands
Origin Time: 2026.09.26-15:01:39.58 UTC
Hypocenter: lat: -21.30°  lon: 168.44°  [+/-31km]    depth: 9km  [+/-23km]
Location Quality: qualityCode:  C     stdErr: 2.2s   assocPhases: 55   usedPhases: 29
minDist: 0.4°   maxDist: 152.6°   AzGap: 189°   2ndAzGap: 192°   atten: -1.22 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 21km   maxHorUnc: 31km   azMaxHorUnc: 98°
68%ConfEllipsoid:   semiMajorAxisLength: 38km   majorAxisAzimuth: 278°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 26km   intermediateAxisAzimuth: 9°   intermediateAxisPlunge: 13°   semiMinorAxisLength: 23km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 12.0s [8]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~40km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (40km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
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.1790434911556.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 239°   dip: 47°   rake: 55°
Nodal Plane 2: strike: 104°   dip: 53°   rake: 121°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 5.1   misfit: 0.02   stationDistributionRatio: 0.51   meanDistP: 49.3   meanDistT: 48.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790434911556.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.1790434911556.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 191°   stationPolarityCount: 12   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790434911556.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790434911556
Event info last updated: 2026.09.26-16:00:01 UTC
Event first association/location: 2026.09.26-15:09:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA