Early-est:     Southeastern Alaska    2025.12.10-11:28:37.68    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 [34]    Mwp: 4.9X [1]    Mwpd: - [0] Region: Southeastern Alaska Origin Time: 2025.12.10-11:28:37.68 UTC Hypocenter: lat: 60.48°  lon: -139.96°  [+/-17km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 65   usedPhases: 39 minDist: 1.0°   maxDist: 167.8°   AzGap: 62°   2ndAzGap: 77°   atten: -0.77 [+/-0.21] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 17km   azMaxHorUnc: 45° 68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 226°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 317°   intermediateAxisPlunge: 7°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.3 [25]    Td: 6.1Xs [2]    Td*T50Ex: - [0]    To: 5.9s [18] Closest plate boundaries:    North America - Pacific [continental convergent boundary]: distance: ~10km    North America / Pacific [subduction zone]: distance: ~350km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  YES (10km)  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        10km        10km        10km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 150°   dip: 44°   rake: -92° Nodal Plane 2: strike: 333°   dip: 46°   rake: -88° Quality: azimuthalGap: -1°   stationPolarityCount: 38   misfitWeightCount: 9.8   misfit: 0.17   stationDistributionRatio: 0.49   meanDistP: 28.9   meanDistT: 41.0   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: 344°   dip: 46°   rake: -109° Nodal Plane 2: strike: 190°   dip: 47°   rake: -71° Quality: azimuthalGap: 58°   stationPolarityCount: 38   misfit: 0.34   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 37.71   fracAcc30degPref: 0.59   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: 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/1765366116903
Event info last updated: 2025.12.10-12:28:44 UTC
Event first association/location: 2025.12.10-11:33:24 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI