Early-est:     Rat Islands, Aleutian Islands    2025.12.09-04:30:01.34    q:B      mb:5.0    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765254601495.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765254601495.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765254601495.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765254601495.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: 5.0 [24]    Mwp: - [0]    Mwpd: - [0]
Region: Rat Islands, Aleutian Islands
Origin Time: 2025.12.09-04:30:01.34 UTC
Hypocenter: lat: 51.08°  lon: 178.74°  [+/-18km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 68   usedPhases: 37
minDist: 0.9°   maxDist: 150.0°   AzGap: 137°   2ndAzGap: 167°   atten: -0.51 [+/-0.26]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 18km   azMaxHorUnc: 24°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 22°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 288°   intermediateAxisPlunge: 15°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [17]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.3s [14]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~50km
Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 28km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (50km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       28km
       -
       -
./hypo.1765254601495.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 24°   dip: 32°   rake: -67°
Nodal Plane 2: strike: 178°   dip: 61°   rake: -104°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 4.0   misfit: 0.15   stationDistributionRatio: 0.28   meanDistP: 50.0   meanDistT: 49.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765254601495.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 325°   dip: 76°   rake: -161°
Nodal Plane 2: strike: 231°   dip: 71°   rake: -14°
Quality: azimuthalGap: 113°   stationPolarityCount: 26   misfit: 0.20   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 29.65   fracAcc30degPref: 0.84   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765254601495.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.1765254601495.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.1765254601495.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765254601495
Event info last updated: 2025.12.09-05:30:18 UTC
Event first association/location: 2025.12.09-04:41:31 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI