Early-est:     Southeastern Alaska    2025.12.07-04:20:42.77    q:B      mb:5.2    Mwp:-    Mwpd:-    Td*T50Ex:0.8     fmamp_polarity:./hypo.1765081244179.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765081244179.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765081244179.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765081244179.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: 5.2 [103]    Mwp: 6.1X [1]    Mwpd: - [0]
Region: Southeastern Alaska
Origin Time: 2025.12.07-04:20:42.77 UTC
Hypocenter: lat: 60.59°  lon: -140.04°  [+/-16km]    depth: 20km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 171   usedPhases: 127
minDist: 7.0°   maxDist: 167.9°   AzGap: 55°   2ndAzGap: 70°   atten: -0.32 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 16km   azMaxHorUnc: 41°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 222°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 321°   intermediateAxisPlunge: 60°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [68]    Td: 2.3s [4]    Td*T50Ex: 0.8 [4]    To: 2.8s [58]
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:
   0.8
   0.8
   0.8
Td*To:
     6.4
     6.4
     6.4
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765081244179.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 104°   dip: 14°   rake: -9°
Nodal Plane 2: strike: 203°   dip: 88°   rake: -104°
Quality: azimuthalGap: -1°   stationPolarityCount: 113   misfitWeightCount: 16.0   misfit: 0.22   stationDistributionRatio: 0.78   meanDistP: 22.3   meanDistT: 20.4   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765081244179.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 95°   dip: 23°   rake: -9°
Nodal Plane 2: strike: 193°   dip: 86°   rake: -112°
Quality: azimuthalGap: 54°   stationPolarityCount: 113   misfit: 0.29   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 33.64   fracAcc30degPref: 0.55   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765081244179.mech.hash.mechanism.jpg
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
./hypo.1765081244179.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1765081244179.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765081244179
Event info last updated: 2025.12.07-05:21:11 UTC
Event first association/location: 2025.12.07-04:26:24 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI