Early-est:     Southeastern Alaska    2025.12.07-18:04:13.40    q:B      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765130652803.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765130652803.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765130652803.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765130652803.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.6 [16]    Mwp: 4.6X [1]    Mwpd: - [0]
Region: Southeastern Alaska
Origin Time: 2025.12.07-18:04:13.40 UTC
Hypocenter: lat: 60.32°  lon: -139.81°  [+/-12km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 49   usedPhases: 20
minDist: 1.1°   maxDist: 150.3°   AzGap: 58°   2ndAzGap: 80°   atten: -1.17 [+/-0.32]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 12km   azMaxHorUnc: 170°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 173°   majorAxisPlunge: 30°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 333°   intermediateAxisPlunge: 58°   semiMinorAxisLength: 11km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.6 [10]    Td: 1.2Xs [1]    Td*T50Ex: - [0]    To: 11.5s [5]
Closest plate boundaries:
   North America - Pacific [continental convergent boundary]: distance: ~20km
   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 (20km)
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765130652803.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 343°   dip: 83°   rake: 174°
Nodal Plane 2: strike: 73°   dip: 84°   rake: 7°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 8.4   misfit: 0.14   stationDistributionRatio: 0.35   meanDistP: 49.3   meanDistT: 43.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765130652803.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 332°   dip: 75°   rake: -165°
Nodal Plane 2: strike: 238°   dip: 75°   rake: -15°
Quality: azimuthalGap: 66°   stationPolarityCount: 22   misfit: 0.44   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 20.24   fracAcc30degPref: 0.98   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765130652803.mech.hash.mechanism.jpg
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
./hypo.1765130652803.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1765130652803.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765130652803
Event info last updated: 2025.12.07-19:04:00 UTC
Event first association/location: 2025.12.07-18:22:13 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI