Early-est:     Vanuatu Islands    2025.12.07-12:16:20.71    q:A      mb:5.2    Mwp:5.8    Mwpd:-    Td*T50Ex:2.4     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

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

Earthquake Details: Magnitude: mb: 5.2 [44]    Mwp: 5.8 [8]    Mwpd: 6.1Xinv [6] Region: Vanuatu Islands Origin Time: 2025.12.07-12:16:20.71 UTC Hypocenter: lat: -14.79°  lon: 166.41°  [+/-14km]    depth: 20km  [+/-13km] Location Quality: qualityCode:  A     stdErr: 2.0s   assocPhases: 120   usedPhases: 73 minDist: 1.0°   maxDist: 156.8°   AzGap: 32°   2ndAzGap: 38°   atten: -0.81 [+/-0.19] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 64° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 247°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 339°   intermediateAxisPlunge: 24°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.7 [41]    Td: 3.7s [12]    Td*T50Ex: 2.4 [12]    To: 39.5s [33] Closest plate boundaries:    New Hebrides / Australia [subduction zone]: distance: ~20km    New Hebrides - Pacific [continental convergent boundary]: distance: ~120km    Pacific / Australia [subduction zone]: distance: ~120km Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands    Slab depth at epicenter: 10km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (20km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    2.4    2.4    2.4 Td*To:      146.2      146.2      146.2 Mwp magnitude:        5.8        5.8        5.8 Hypocenter depth:        20km        20km        20km Slab depth at epicenter:        10km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 205°   dip: 81°   rake: -178° Nodal Plane 2: strike: 115°   dip: 88°   rake: -9° Quality: azimuthalGap: -1°   stationPolarityCount: 67   misfitWeightCount: 13.4   misfit: 0.09   stationDistributionRatio: 0.36   meanDistP: 39.5   meanDistT: 23.4   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 209°   dip: 86°   rake: 166° Nodal Plane 2: strike: 300°   dip: 76°   rake: 4° Quality: azimuthalGap: 32°   stationPolarityCount: 67   misfit: 0.32   stationDistributionRatio: 0.53   rmsAngDiffAccPref: 22.76   fracAcc30degPref: 0.95   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available) Nodal Plane 1: strike: 0°   dip: 0°   rake: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available) Nodal Plane 1: strike: 0°   dip: 0°   rake: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/_amp_mwp

Event ID: smi:KOERI/ee/event/1765109779464
Event info last updated: 2025.12.07-13:16:43 UTC
Event first association/location: 2025.12.07-12:22:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI