Early-est:     Vanuatu Islands Region    2026.09.25-11:12:16.15    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     fmamp_polarity_waveform:     hash:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 4.7* [13]    Mwp: - [0]    Mwpd: - [0] Region: Vanuatu Islands Region Origin Time: 2026.09.25-11:12:16.15 UTC Hypocenter: lat: -21.75°  lon: 174.02°  [+/-14km]    depth: 9km  [+/-13km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 27   usedPhases: 15 minDist: 5.5°   maxDist: 149.9°   AzGap: 131°   2ndAzGap: 215°   atten: -1.34 [+/-0.23] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 14km   azMaxHorUnc: 100° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 98°   majorAxisPlunge: 17°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 350°   intermediateAxisPlunge: 45°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 10.4s [10] Closest plate boundaries:    Conway Reef - New Hebrides [continental rift boundary]: distance: ~10km    Australia - Conway Reef [oceanic transform fault]: distance: ~80km    New Hebrides - Australia [oceanic spreading ridge]: distance: ~80km    New Hebrides / Australia [subduction zone]: distance: ~230km 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:        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)

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 80°   dip: 8°   rake: 171° Nodal Plane 2: strike: 178°   dip: 89°   rake: 82° Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 3.3   misfit: 0.00   stationDistributionRatio: 0.27   meanDistP: 52.8   meanDistT: 53.4   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
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
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 310°   dip: 16°   rake: 114° Nodal Plane 2: strike: 106°   dip: 75°   rake: 83° Quality: azimuthalGap: 130°   stationPolarityCount: 13   misfit: 0.28   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 38.56   fracAcc30degPref: 0.46   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1790334737133
Event info last updated: 2026.09.25-12:11:00 UTC
Event first association/location: 2026.09.25-11:19:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA