Early-est:     Fox Islands, Aleutian Islands    2025.11.09-09:36:51.08    q:B      mb:4.9    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1762681010950.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1762681010950.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1762681010950.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1762681010950.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: 4.9 [20]    Mwp: - [0]    Mwpd: - [0]
Region: Fox Islands, Aleutian Islands
Origin Time: 2025.11.09-09:36:51.08 UTC
Hypocenter: lat: 51.91°  lon: -171.13°  [+/-15km]    depth: 20km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.8s   assocPhases: 56   usedPhases: 30
minDist: 1.2°   maxDist: 150.2°   AzGap: 94°   2ndAzGap: 106°   atten: -1.83 [+/-0.40]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 173°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 355°   majorAxisPlunge: 18°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 87°   intermediateAxisPlunge: 6°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [12]    Td: -s [0]    Td*T50Ex: - [0]    To: 20.9s [8]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~70km
Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 33km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (70km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       33km
       -
       -
./hypo.1762681010950.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 45°   dip: 28°   rake: 150°
Nodal Plane 2: strike: 161°   dip: 76°   rake: 65°
Quality: azimuthalGap: -1°   stationPolarityCount: 24   misfitWeightCount: 6.1   misfit: 0.23   stationDistributionRatio: 0.28   meanDistP: 48.3   meanDistT: 39.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1762681010950.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 43°   dip: 20°   rake: 139°
Nodal Plane 2: strike: 172°   dip: 77°   rake: 75°
Quality: azimuthalGap: 136°   stationPolarityCount: 24   misfit: 0.41   stationDistributionRatio: 0.49   rmsAngDiffAccPref: 37.77   fracAcc30degPref: 0.44   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1762681010950.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.1762681010950.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.1762681010950.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1762681010950
Event info last updated: 2025.11.09-10:37:13 UTC
Event first association/location: 2025.11.09-09:56:40 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI