Early-est:     South of Alaska    2026.08.11-09:36:40.20    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786440999937.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786440999937.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786440999937.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* [7]    Mwp: - [0]    Mwpd: - [0]
Region: South of Alaska
Origin Time: 2026.08.11-09:36:40.20 UTC
Hypocenter: lat: 54.58°  lon: -159.85°  [+/-18km]    depth: 9km  [+/-15km]
Location Quality: qualityCode:  C     stdErr: 1.5s   assocPhases: 13   usedPhases: 7
minDist: 5.2°   maxDist: 51.3°   AzGap: 181°   2ndAzGap: 193°   atten: -1.95 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 18km   azMaxHorUnc: 150°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 331°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 62°   intermediateAxisPlunge: 15°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [8]    Td: 0.6Xs [1]    Td*T50Ex: - [0]    To: 5.7s [8]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~90km
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 (90km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
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.1786440999937.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 151°   dip: 41°   rake: 140°
Nodal Plane 2: strike: 273°   dip: 65°   rake: 57°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 3.7   misfit: 0.05   stationDistributionRatio: 0.45   meanDistP: 53.9   meanDistT: 54.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786440999937.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.1786440999937.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 180°   stationPolarityCount: 9   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786440999937.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786440999937
Event info last updated: 2026.08.11-10:35:00 UTC
Event first association/location: 2026.08.11-09:41:13 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA