Early-est:     Andreanof Islands, Aleutian Is.    2026.08.09-03:36:22.56    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786246582835.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786246582835.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786246582835.mech.hash.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* [29]    Mwp: - [0]    Mwpd: - [0]
Region: Andreanof Islands, Aleutian Is.
Origin Time: 2026.08.09-03:36:22.56 UTC
Hypocenter: lat: 52.02°  lon: -173.19°  [+/-18km]    depth: 86km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 57   usedPhases: 34
minDist: 0.6°   maxDist: 152.9°   AzGap: 130°   2ndAzGap: 132°   atten: -0.88 [+/-0.55]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 18km   azMaxHorUnc: 168°
68%ConfEllipsoid:   semiMajorAxisLength: 23km   majorAxisAzimuth: 349°   majorAxisPlunge: 16°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 135°   intermediateAxisPlunge: 71°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [16]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.7s [16]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~120km
Subduction geometry:    Zone: Alaska-Aleutians: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (120km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       86km
       86km
       86km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1786246582835.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 56°   dip: 39°   rake: 126°
Nodal Plane 2: strike: 193°   dip: 59°   rake: 64°
Quality: azimuthalGap: -1°   stationPolarityCount: 28   misfitWeightCount: 6.4   misfit: 0.14   stationDistributionRatio: 0.28   meanDistP: 48.6   meanDistT: 46.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786246582835.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1786246582835.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 245°   dip: 75°   rake: -172°
Nodal Plane 2: strike: 153°   dip: 82°   rake: -16°
Quality: azimuthalGap: 113°   stationPolarityCount: 28   misfit: 0.26   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 29.81   fracAcc30degPref: 0.62   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786246582835.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786246582835
Event info last updated: 2026.08.09-04:35:01 UTC
Event first association/location: 2026.08.09-03:45:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA