Early-est:     Kuril Islands    2026.10.11-17:00:24.30    q:B      mb:5.2    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: 5.2 [62]    Mwp: 5.8X [2]    Mwpd: 6.0Xinv [1] Region: Kuril Islands Origin Time: 2026.10.11-17:00:24.30 UTC Hypocenter: lat: 49.55°  lon: 156.28°  [+/-23km]    depth: 20km  [+/-40km] Location Quality: qualityCode:  B     stdErr: 1.8s   assocPhases: 141   usedPhases: 84 minDist: 9.4°   maxDist: 151.4°   AzGap: 68°   2ndAzGap: 73°   atten: -0.85 [+/-0.17] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 23km   azMaxHorUnc: 112° 68%ConfEllipsoid:   semiMajorAxisLength: 45km   majorAxisAzimuth: 290°   majorAxisPlunge: 59°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 131°   intermediateAxisPlunge: 30°   semiMinorAxisLength: 18km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.8 [56]    Td: 1.7Xs [2]    Td*T50Ex: - [0]    To: 47.5s [47] Closest plate boundaries:    Okhotsk / Pacific [subduction zone]: distance: ~110km    North America / Pacific [subduction zone]: distance: ~820km    Okhotsk / North America [subduction zone]: distance: ~820km 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 (110km)  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: 169°   dip: 37°   rake: 69° Nodal Plane 2: strike: 15°   dip: 56°   rake: 105° Quality: azimuthalGap: -1°   stationPolarityCount: 66   misfitWeightCount: 7.0   misfit: 0.27   stationDistributionRatio: 0.58   meanDistP: 45.1   meanDistT: 32.2   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: 313°   dip: 8°   rake: -119° Nodal Plane 2: strike: 162°   dip: 83°   rake: -86° Quality: azimuthalGap: 70°   stationPolarityCount: 66   misfit: 0.31   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 27.43   fracAcc30degPref: 0.64   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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/1791738024536
Event info last updated: 2026.10.11-18:01:04 UTC
Event first association/location: 2026.10.11-17:10:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI