Early-est:     Rat Islands, Aleutian Islands    2026.10.12-14:30:01.08    q:C      mb:4.7    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: 4.7 [17]    Mwp: - [0]    Mwpd: - [0] Region: Rat Islands, Aleutian Islands Origin Time: 2026.10.12-14:30:01.08 UTC Hypocenter: lat: 51.69°  lon: 175.18°  [+/-13km]    depth: 20km  [+/-18km] Location Quality: qualityCode:  C     stdErr: 2.4s   assocPhases: 41   usedPhases: 21 minDist: 2.1°   maxDist: 144.6°   AzGap: 133°   2ndAzGap: 182°   atten: -0.82 [+/-0.35] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 172° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 353°   majorAxisPlunge: 82°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 172°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [10]    Td: -s [0]    Td*T50Ex: - [0]    To: 9.9s [4] Closest plate boundaries:    North America / Pacific [subduction zone]: distance: ~70km    Okhotsk / Pacific [subduction zone]: distance: ~830km    Okhotsk / North America [subduction zone]: distance: ~830km Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 23km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (70km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        20km        20km        20km Slab depth at epicenter:        23km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 3°   dip: 59°   rake: -31° Nodal Plane 2: strike: 109°   dip: 64°   rake: -145° Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 6.8   misfit: 0.08   stationDistributionRatio: 0.31   meanDistP: 32.1   meanDistT: 44.4   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: 106°   dip: 70°   rake: -144° Nodal Plane 2: strike: 2°   dip: 57°   rake: -25° Quality: azimuthalGap: 132°   stationPolarityCount: 21   misfit: 0.20   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 38.89   fracAcc30degPref: 0.53   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/1791815400037
Event info last updated: 2026.10.12-15:30:00 UTC
Event first association/location: 2026.10.12-14:41:16 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI