Early-est:     Santa Cruz Islands    2025.12.13-18:54:02.72    q:B      mb:4.5    Mwp:-    Mwpd:-    Td*T50Ex:-     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: 4.5 [33]    Mwp: - [0]    Mwpd: - [0] Region: Santa Cruz Islands Origin Time: 2025.12.13-18:54:02.72 UTC Hypocenter: lat: -12.59°  lon: 166.90°  [+/-16km]    depth: 274km  [+/-19km] Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 91   usedPhases: 44 minDist: 2.9°   maxDist: 151.0°   AzGap: 44°   2ndAzGap: 60°   atten: -0.77 [+/-0.24] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 16km   azMaxHorUnc: 7° 68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 44°   majorAxisPlunge: 41°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 137°   intermediateAxisPlunge: 4°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [17]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.2s [14] Closest plate boundaries:    Pacific / Australia [subduction zone]: distance: ~110km    New Hebrides - Pacific [continental convergent boundary]: distance: ~120km    New Hebrides / Australia [subduction zone]: distance: ~150km Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands    Slab depth at epicenter: 142km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (110km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        274km        274km        274km Slab depth at epicenter:        142km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 173°   dip: 35°   rake: -121° Nodal Plane 2: strike: 29°   dip: 60°   rake: -70° Quality: azimuthalGap: -1°   stationPolarityCount: 46   misfitWeightCount: 13.9   misfit: 0.25   stationDistributionRatio: 0.50   meanDistP: 38.0   meanDistT: 37.1   qualityCode: D 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: 188°   dip: 51°   rake: -172° Nodal Plane 2: strike: 93°   dip: 84°   rake: -40° Quality: azimuthalGap: 41°   stationPolarityCount: 46   misfit: 0.36   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 20.35   fracAcc30degPref: 0.88   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/1765652038227
Event info last updated: 2025.12.13-19:55:02 UTC
Event first association/location: 2025.12.13-18:59:01 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI