Early-est:     Vanuatu Islands Region    2026.04.03-23:04:17.11    q:C      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775257460824.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775257460824.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775257460824.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: 4.5* [13]    Mwp: - [0]    Mwpd: - [0]
Region: Vanuatu Islands Region
Origin Time: 2026.04.03-23:04:17.11 UTC
Hypocenter: lat: -14.89°  lon: 170.49°  [+/-36km]    depth: 624km  [+/-33km]
Location Quality: qualityCode:  C     stdErr: 1.1s   assocPhases: 36   usedPhases: 12
minDist: 7.0°   maxDist: 144.7°   AzGap: 134°   2ndAzGap: 190°   atten: -1.63 [+/-0.30]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 31km   maxHorUnc: 36km   azMaxHorUnc: 124°
68%ConfEllipsoid:   semiMajorAxisLength: 45km   majorAxisAzimuth: 303°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 38km   intermediateAxisAzimuth: 211°   intermediateAxisPlunge: 10°   semiMinorAxisLength: 32km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.3s [8]
Closest plate boundaries:
   New Hebrides - Pacific [oceanic spreading ridge]: distance: ~90km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       624km
       624km
       624km
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.1775257460824.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 87°   dip: 74°   rake: -172°
Nodal Plane 2: strike: 355°   dip: 82°   rake: -16°
Quality: azimuthalGap: -1°   stationPolarityCount: 11   misfitWeightCount: 3.8   misfit: 0.11   stationDistributionRatio: 0.46   meanDistP: 52.8   meanDistT: 54.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775257460824.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.1775257460824.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 78°   dip: 62°   rake: -179°
Nodal Plane 2: strike: 347°   dip: 89°   rake: -28°
Quality: azimuthalGap: 142°   stationPolarityCount: 11   misfit: 0.28   stationDistributionRatio: 0.76   rmsAngDiffAccPref: 40.95   fracAcc30degPref: 0.40   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775257460824.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775257460824
Event info last updated: 2026.04.04-00:03:00 UTC
Event first association/location: 2026.04.03-23:10:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA