Early-est:     Vanuatu Islands    2026.10.08-09:00:10.10    q:A      mb:5.5    Mwp:6.3    Mwpd:-    Td*T50Ex:2.3     fmamp_polarity:./hypo.1791450009716.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791450009716.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791450009716.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791450009716.mech.fmamp_amp_mwp.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 5.5 [104]    Mwp: 6.3 [63]    Mwpd: 6.4Xinv [53]
Region: Vanuatu Islands
Origin Time: 2026.10.08-09:00:10.10 UTC
Hypocenter: lat: -15.46°  lon: 168.30°  [+/-13km]    depth: 10km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.7s   assocPhases: 299   usedPhases: 225
minDist: 1.1°   maxDist: 175.3°   AzGap: 24°   2ndAzGap: 29°   atten: -1.12 [+/-0.13]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 13km   azMaxHorUnc: 90°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 90°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 184°   intermediateAxisPlunge: 52°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [83]    Td: 4.6s [34]    Td*T50Ex: 2.3 [34]    To: 17.4s [69]
Closest plate boundaries:
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:
   2.3
   2.3
   2.3
Td*To:
     80.0
     80.0
     80.0
Mwp magnitude:
       6.3
       6.3
       6.3
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791450009716.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 31°   dip: 70°   rake: -175°
Nodal Plane 2: strike: 300°   dip: 86°   rake: -20°
Quality: azimuthalGap: -1°   stationPolarityCount: 208   misfitWeightCount: 34.1   misfit: 0.17   stationDistributionRatio: 0.42   meanDistP: 16.0   meanDistT: 10.7   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791450009716.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 41°   dip: 47°   rake: 162°
Nodal Plane 2: strike: 144°   dip: 77°   rake: 44°
Quality: azimuthalGap: 24°   stationPolarityCount: 208   misfit: 0.34   stationDistributionRatio: 0.47   rmsAngDiffAccPref: 39.12   fracAcc30degPref: 0.55   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791450009716.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 126°   dip: 81°   rake: 8°
Nodal Plane 2: strike: 34°   dip: 82°   rake: 170°
Quality: azimuthalGap: -1°   stationPolarityCount: 77   misfitWeightCount: 13.7   misfit: 9999.90   stationDistributionRatio: 0.19   meanDistP: 32.4   meanDistT: 29.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1791450009716.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):
Nodal Plane 1: strike: 39°   dip: 76°   rake: 173°
Nodal Plane 2: strike: 131°   dip: 83°   rake: 14°
Quality: azimuthalGap: -1°   stationPolarityCount: 60   misfitWeightCount: 10.8   misfit: 9999.90   stationDistributionRatio: 0.09   meanDistP: 23.0   meanDistT: 24.0   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp
./hypo.1791450009716.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791450009716
Event info last updated: 2026.10.08-10:00:47 UTC
Event first association/location: 2026.10.08-09:04:40 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI