Early-est:     Kuril Islands    2025.12.12-17:43:11.45    q:A      mb:5.3    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: 5.3 [172]    Mwp: 5.2X [2]    Mwpd: 5.9Xinv [2] Region: Kuril Islands Origin Time: 2025.12.12-17:43:11.45 UTC Hypocenter: lat: 50.68°  lon: 157.06°  [+/-14km]    depth: 31km  [+/-18km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 243   usedPhases: 210 minDist: 2.5°   maxDist: 164.3°   AzGap: 37°   2ndAzGap: 60°   atten: -0.70 [+/-0.23] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 143° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 327°   majorAxisPlunge: 60°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 138°   intermediateAxisPlunge: 29°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [131]    Td: 1.2Xs [2]    Td*T50Ex: - [0]    To: 1.7s [120] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~150km    North America / Pacific [subduction zone]: distance: ~690km    Okhotsk / North America [subduction zone]: distance: ~690km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 49km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (150km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        31km        31km        31km Slab depth at epicenter:        49km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 181°   dip: 50°   rake: 31° Nodal Plane 2: strike: 69°   dip: 67°   rake: 135° Quality: azimuthalGap: -1°   stationPolarityCount: 185   misfitWeightCount: 22.2   misfit: 0.25   stationDistributionRatio: 0.54   meanDistP: 23.6   meanDistT: 27.5   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 256°   dip: 65°   rake: 180° Nodal Plane 2: strike: 346°   dip: 90°   rake: 25° Quality: azimuthalGap: 40°   stationPolarityCount: 185   misfit: 0.51   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 45.29   fracAcc30degPref: 0.54   qualityCode: D 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/1765561394556
Event info last updated: 2025.12.12-18:43:28 UTC
Event first association/location: 2025.12.12-17:49:26 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI