Early-est:     Kuril Islands    2025.12.11-14:49:01.83    q:C      mb:4.4    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: 4.4 [16]    Mwp: - [0]    Mwpd: - [0] Region: Kuril Islands Origin Time: 2025.12.11-14:49:01.83 UTC Hypocenter: lat: 47.50°  lon: 152.52°  [+/-18km]    depth: 155km  [+/-19km] Location Quality: qualityCode:  C     stdErr: 1.1s   assocPhases: 47   usedPhases: 21 minDist: 6.6°   maxDist: 164.7°   AzGap: 63°   2ndAzGap: 95°   atten: -1.28 [+/-0.18] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 18km   azMaxHorUnc: 25° 68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 200°   majorAxisPlunge: 27°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 88°   intermediateAxisPlunge: 37°   semiMinorAxisLength: 17km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.6 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.4Xs [2] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~170km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 76km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (170km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        155km        155km        155km Slab depth at epicenter:        76km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 243°   dip: 44°   rake: 118° Nodal Plane 2: strike: 26°   dip: 52°   rake: 65° Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 7.7   misfit: 0.08   stationDistributionRatio: 0.45   meanDistP: 36.8   meanDistT: 35.9   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: 261°   dip: 54°   rake: 165° Nodal Plane 2: strike: 0°   dip: 78°   rake: 37° Quality: azimuthalGap: 74°   stationPolarityCount: 17   misfit: 0.29   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 27.08   fracAcc30degPref: 0.75   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/1765464541905
Event info last updated: 2025.12.11-15:49:04 UTC
Event first association/location: 2025.12.11-15:00:43 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI