Early-est:     Fox Islands, Aleutian Islands    2025.12.12-18:15:00.45    q:B      mb:4.9    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: 4.9 [46]    Mwp: - [0]    Mwpd: - [0] Region: Fox Islands, Aleutian Islands Origin Time: 2025.12.12-18:15:00.45 UTC Hypocenter: lat: 52.07°  lon: -169.35°  [+/-15km]    depth: 10km  [+/-15km] Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 87   usedPhases: 58 minDist: 0.8°   maxDist: 150.8°   AzGap: 143°   2ndAzGap: 156°   atten: -0.10 [+/-0.29] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 169° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 350°   majorAxisPlunge: 25°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 82°   intermediateAxisPlunge: 4°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [25]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.3s [21] Closest plate boundaries:    North America / Pacific [subduction zone]: distance: ~40km Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 22km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (40km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        22km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 171°   dip: 24°   rake: -22° Nodal Plane 2: strike: 281°   dip: 81°   rake: -112° Quality: azimuthalGap: -1°   stationPolarityCount: 54   misfitWeightCount: 6.6   misfit: 0.12   stationDistributionRatio: 0.27   meanDistP: 42.8   meanDistT: 32.9   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: 291°   dip: 68°   rake: -123° Nodal Plane 2: strike: 171°   dip: 39°   rake: -37° Quality: azimuthalGap: 81°   stationPolarityCount: 54   misfit: 0.36   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 37.98   fracAcc30degPref: 0.56   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/1765563300298
Event info last updated: 2025.12.12-19:15:06 UTC
Event first association/location: 2025.12.12-18:28:29 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI