Early-est:     Rat Islands, Aleutian Islands    2025.12.13-10:51:01.53    q:A      mb:5.3    Mwp:5.6    Mwpd:-    Td*T50Ex:0.7     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 [177]    Mwp: 5.6 [6]    Mwpd: 5.8Xinv [7] Region: Rat Islands, Aleutian Islands Origin Time: 2025.12.13-10:51:01.53 UTC Hypocenter: lat: 51.86°  lon: 178.45°  [+/-14km]    depth: 109km  [+/-17km] Location Quality: qualityCode:  A     stdErr: 0.9s   assocPhases: 331   usedPhases: 225 minDist: 0.1°   maxDist: 160.2°   AzGap: 26°   2ndAzGap: 39°   atten: -0.73 [+/-0.22] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 160° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 338°   majorAxisPlunge: 40°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 170°   intermediateAxisPlunge: 49°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [126]    Td: 2.4s [10]    Td*T50Ex: 0.7 [10]    To: 1.8s [117] Closest plate boundaries:    North America / Pacific [subduction zone]: distance: ~140km Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 84km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (140km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    0.7    0.7    0.7 Td*To:      4.3      4.3      4.3 Mwp magnitude:        5.6        5.6        5.6 Hypocenter depth:        109km        109km        109km Slab depth at epicenter:        84km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY): Nodal Plane 1: strike: 111°   dip: 17°   rake: -171° Nodal Plane 2: strike: 12°   dip: 87°   rake: -73° Quality: azimuthalGap: -1°   stationPolarityCount: 202   misfitWeightCount: 42.4   misfit: 0.21   stationDistributionRatio: 0.60   meanDistP: 20.1   meanDistT: 16.3   qualityCode: B 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: 211°   dip: 10°   rake: -52° Nodal Plane 2: strike: 352°   dip: 82°   rake: -96° Quality: azimuthalGap: 26°   stationPolarityCount: 202   misfit: 0.28   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 27.08   fracAcc30degPref: 0.75   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 127°   dip: 24°   rake: -141° Nodal Plane 2: strike: 1°   dip: 75°   rake: -71° Quality: azimuthalGap: -1°   stationPolarityCount: 42   misfitWeightCount: 7.0   misfit: 9999.90   stationDistributionRatio: 0.75   meanDistP: 22.4   meanDistT: 27.2   qualityCode: C 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/1765623062199
Event info last updated: 2025.12.13-11:51:29 UTC
Event first association/location: 2025.12.13-10:56:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI