Early-est:     Northern Alaska    2025.12.10-22:17:15.15    q:B      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765405034774.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765405034774.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765405034774.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765405034774.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 [20]    Mwp: - [0]    Mwpd: - [0]
Region: Northern Alaska
Origin Time: 2025.12.10-22:17:15.15 UTC
Hypocenter: lat: 68.32°  lon: -156.34°  [+/-13km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 46   usedPhases: 24
minDist: 2.5°   maxDist: 151.9°   AzGap: 60°   2ndAzGap: 89°   atten: -0.88 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 113°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 113°   majorAxisPlunge: 17°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 247°   intermediateAxisPlunge: 66°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.3 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.1s [11]
Closest plate boundaries:
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765405034774.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 37°   dip: 46°   rake: -118°
Nodal Plane 2: strike: 255°   dip: 51°   rake: -64°
Quality: azimuthalGap: -1°   stationPolarityCount: 23   misfitWeightCount: 7.7   misfit: 0.11   stationDistributionRatio: 0.45   meanDistP: 37.2   meanDistT: 36.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765405034774.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 9°   dip: 87°   rake: -174°
Nodal Plane 2: strike: 279°   dip: 84°   rake: -3°
Quality: azimuthalGap: 60°   stationPolarityCount: 23   misfit: 0.26   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 24.66   fracAcc30degPref: 0.89   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765405034774.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.1765405034774.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.1765405034774.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765405034774
Event info last updated: 2025.12.10-23:17:30 UTC
Event first association/location: 2025.12.10-22:23:34 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI