Early-est:     Loyalty Islands    2026.09.26-01:10:43.75    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790385044571.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790385044571.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790385044571.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* [18]    Mwp: - [0]    Mwpd: - [0]
Region: Loyalty Islands
Origin Time: 2026.09.26-01:10:43.75 UTC
Hypocenter: lat: -21.19°  lon: 168.41°  [+/-18km]    depth: 146km  [+/-19km]
Location Quality: qualityCode:  C     stdErr: 0.8s   assocPhases: 56   usedPhases: 17
minDist: 1.9°   maxDist: 152.5°   AzGap: 178°   2ndAzGap: 189°   atten: -1.56 [+/-0.80]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 18km   azMaxHorUnc: 41°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 222°   majorAxisPlunge: 31°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 26°   intermediateAxisPlunge: 58°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [8]    Td: 4.4Xs [1]    Td*T50Ex: - [0]    To: 14.4s [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:
       146km
       146km
       146km
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.1790385044571.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 125°   dip: 35°   rake: -157°
Nodal Plane 2: strike: 16°   dip: 77°   rake: -57°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 6.1   misfit: 0.09   stationDistributionRatio: 0.29   meanDistP: 46.0   meanDistT: 53.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790385044571.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.1790385044571.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 126°   dip: 69°   rake: 179°
Nodal Plane 2: strike: 216°   dip: 89°   rake: 21°
Quality: azimuthalGap: 120°   stationPolarityCount: 16   misfit: 0.39   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 34.01   fracAcc30degPref: 0.52   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790385044571.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790385044571
Event info last updated: 2026.09.26-02:09:00 UTC
Event first association/location: 2026.09.26-01:22:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA