Early-est:     Loyalty Islands    2026.09.26-18:25:24.61    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790447131083.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790447131083.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790447131083.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: 4.7* [9]    Mwp: - [0]    Mwpd: - [0]
Region: Loyalty Islands
Origin Time: 2026.09.26-18:25:24.61 UTC
Hypocenter: lat: -21.19°  lon: 168.75°  [+/-17km]    depth: 9km  [+/-13km]
Location Quality: qualityCode:  C     stdErr: 2.3s   assocPhases: 52   usedPhases: 26
minDist: 0.7°   maxDist: 152.6°   AzGap: 110°   2ndAzGap: 188°   atten: -1.17 [+/-0.42]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 17km   azMaxHorUnc: 23°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 22°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 289°   intermediateAxisPlunge: 17°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.1s [6]
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:
       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.1790447131083.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 104°   dip: 32°   rake: -170°
Nodal Plane 2: strike: 5°   dip: 85°   rake: -59°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 5.6   misfit: 0.04   stationDistributionRatio: 0.48   meanDistP: 41.3   meanDistT: 49.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790447131083.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.1790447131083.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 175°   dip: 10°   rake: -158°
Nodal Plane 2: strike: 64°   dip: 86°   rake: -80°
Quality: azimuthalGap: 130°   stationPolarityCount: 12   misfit: 0.30   stationDistributionRatio: 0.59   rmsAngDiffAccPref: 44.62   fracAcc30degPref: 0.36   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790447131083.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790447131083
Event info last updated: 2026.09.26-19:24:00 UTC
Event first association/location: 2026.09.26-18:36:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA