Early-est:     Santa Cruz Islands    2025.12.09-11:25:38.44    q:B      mb:4.8    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: 4.8 [21]    Mwp: - [0]    Mwpd: - [0] Region: Santa Cruz Islands Origin Time: 2025.12.09-11:25:38.44 UTC Hypocenter: lat: -12.42°  lon: 166.50°  [+/-14km]    depth: 68km  [+/-17km] Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 64   usedPhases: 29 minDist: 3.1°   maxDist: 148.9°   AzGap: 138°   2ndAzGap: 144°   atten: -1.46 [+/-0.30] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 120° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 303°   majorAxisPlunge: 43°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 55°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [13]    Td: 0.7Xs [1]    Td*T50Ex: - [0]    To: 1.4s [7] Closest plate boundaries:    Pacific / Australia [subduction zone]: distance: ~70km    New Hebrides - Pacific [continental convergent boundary]: distance: ~150km    New Hebrides / Australia [subduction zone]: distance: ~160km Subduction geometry:    Zone: Santa Cruz Islands/Vanuatu/Loyalty Islands    Slab depth at epicenter: 42km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (70km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        68km        68km        68km Slab depth at epicenter:        42km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 134°   dip: 48°   rake: -59° Nodal Plane 2: strike: 272°   dip: 51°   rake: -120° Quality: azimuthalGap: -1°   stationPolarityCount: 27   misfitWeightCount: 8.2   misfit: 0.12   stationDistributionRatio: 0.45   meanDistP: 52.1   meanDistT: 32.0   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: 264°   dip: 48°   rake: -132° Nodal Plane 2: strike: 137°   dip: 57°   rake: -54° Quality: azimuthalGap: 144°   stationPolarityCount: 28   misfit: 0.24   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 32.35   fracAcc30degPref: 0.68   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: 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/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp

Event ID: smi:KOERI/ee/event/1765279540650
Event info last updated: 2025.12.09-12:25:44 UTC
Event first association/location: 2025.12.09-11:30:37 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI