Early-est:     Kermadec Islands Region    2025.12.09-06:55:04.78    q:B      mb:3.9    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: 3.9 [12]    Mwp: - [0]    Mwpd: - [0] Region: Kermadec Islands Region Origin Time: 2025.12.09-06:55:04.78 UTC Hypocenter: lat: -27.75°  lon: -178.65°  [+/-14km]    depth: 391km  [+/-17km] Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 16   usedPhases: 15 minDist: 10.0°   maxDist: 94.7°   AzGap: 171°   2ndAzGap: 181°   atten: -1.09 [+/-0.45] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 14km   azMaxHorUnc: 94° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 278°   majorAxisPlunge: 56°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 92°   intermediateAxisPlunge: 34°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0X [1]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0] Closest plate boundaries:    Kermadec - Australia [continental rift boundary]: distance: ~30km    Kermadec / Pacific [subduction zone]: distance: ~280km Subduction geometry:    Zone: Kermadec-Tonga    Slab depth at epicenter: 278km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (280km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        391km        391km        391km Slab depth at epicenter:        278km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 202°   dip: 49°   rake: 56° Nodal Plane 2: strike: 68°   dip: 51°   rake: 123° Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 5.3   misfit: 0.13   stationDistributionRatio: 0.49   meanDistP: 38.5   meanDistT: 44.1   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 171°   stationPolarityCount: 15   misfit: 0.99   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 26.79   fracAcc30degPref: 0.00   qualityCode: E 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/1765263303974
Event info last updated: 2025.12.09-07:55:27 UTC
Event first association/location: 2025.12.09-07:02:04 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI