Early-est:     Loyalty Islands    2026.06.23-13:58:40.38    q:B      mb:5.1*    Mwp:5.4    Mwpd:-    Td*T50Ex:1.6     fmamp_polarity:./hypo.1782223118954.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1782223118954.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1782223118954.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* [31]    Mwp: 5.4 [7]    Mwpd: 5.7Xinv [2]
Region: Loyalty Islands
Origin Time: 2026.06.23-13:58:40.38 UTC
Hypocenter: lat: -20.68°  lon: 168.99°  [+/-34km]    depth: 30km  [+/-33km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 98   usedPhases: 62
minDist: 1.2°   maxDist: 164.8°   AzGap: 90°   2ndAzGap: 112°   atten: -1.63 [+/-0.24]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 31km   maxHorUnc: 34km   azMaxHorUnc: 0°
68%ConfEllipsoid:   semiMajorAxisLength: 43km   majorAxisAzimuth: 180°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 38km   intermediateAxisAzimuth: 90°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 33km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [27]    Td: 3.4s [5]    Td*T50Ex: 1.6 [5]    To: 2.8s [26]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~40km
Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
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:
   1.6
   1.6
   1.6
Td*To:
     9.5
     9.5
     9.5
Mwp magnitude:
       5.4
       5.4
       5.4
Hypocenter depth:
       30km
       30km
       30km
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.1782223118954.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 11°   dip: 50°   rake: 127°
Nodal Plane 2: strike: 142°   dip: 53°   rake: 54°
Quality: azimuthalGap: -1°   stationPolarityCount: 33   misfitWeightCount: 9.3   misfit: 0.14   stationDistributionRatio: 0.50   meanDistP: 42.6   meanDistT: 39.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1782223118954.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.1782223118954.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 3°   dip: 41°   rake: 135°
Nodal Plane 2: strike: 130°   dip: 62°   rake: 59°
Quality: azimuthalGap: 89°   stationPolarityCount: 33   misfit: 0.18   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 47.99   fracAcc30degPref: 0.29   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1782223118954.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1782223118954
Event info last updated: 2026.06.23-14:57:00 UTC
Event first association/location: 2026.06.23-14:02:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA