Early-est:     Kuril Islands    2026.10.06-17:47:05.42    q:B      mb:4.6    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: 4.6 [16]    Mwp: - [0]    Mwpd: - [0] Region: Kuril Islands Origin Time: 2026.10.06-17:47:05.42 UTC Hypocenter: lat: 43.99°  lon: 147.94°  [+/-14km]    depth: 20km  [+/-13km] Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 54   usedPhases: 25 minDist: 4.0°   maxDist: 84.2°   AzGap: 136°   2ndAzGap: 145°   atten: -1.14 [+/-0.25] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 135° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 315°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 225°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 12.3s [4] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~90km    Pacific \ Okhotsk [subduction zone]: distance: ~450km Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 34km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (90km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        20km        20km        20km Slab depth at epicenter:        34km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 318°   dip: 35°   rake: -49° Nodal Plane 2: strike: 91°   dip: 64°   rake: -115° Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 4.3   misfit: 0.11   stationDistributionRatio: 0.47   meanDistP: 41.2   meanDistT: 50.8   qualityCode: D 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: 339°   dip: 84°   rake: 99° Nodal Plane 2: strike: 99°   dip: 11°   rake: 31° Quality: azimuthalGap: 95°   stationPolarityCount: 21   misfit: 0.41   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 47.98   fracAcc30degPref: 0.30   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/1791308825846
Event info last updated: 2026.10.06-18:47:11 UTC
Event first association/location: 2026.10.06-17:56:01 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI