Early-est:     Alaska Peninsula    2026.08.17-20:35:10.32    q:C      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786998910224.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786998910224.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786998910224.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: 5.0* [20]    Mwp: - [0]    Mwpd: - [0]
Region: Alaska Peninsula
Origin Time: 2026.08.17-20:35:10.32 UTC
Hypocenter: lat: 57.40°  lon: -155.26°  [+/-17km]    depth: 30km  [+/-26km]
Location Quality: qualityCode:  C     stdErr: 1.6s   assocPhases: 40   usedPhases: 28
minDist: 1.5°   maxDist: 151.2°   AzGap: 94°   2ndAzGap: 162°   atten: -1.39 [+/-0.40]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 16km   maxHorUnc: 17km   azMaxHorUnc: 31°
68%ConfEllipsoid:   semiMajorAxisLength: 29km   majorAxisAzimuth: 38°   majorAxisPlunge: 58°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 130°   intermediateAxisPlunge: 1°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [9]    Td: 5.8Xs [1]    Td*T50Ex: - [0]    To: 14.3s [8]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~240km
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 (240km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       30km
       30km
       30km
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.1786998910224.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 158°   dip: 31°   rake: -136°
Nodal Plane 2: strike: 29°   dip: 69°   rake: -66°
Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 3.8   misfit: 0.12   stationDistributionRatio: 0.35   meanDistP: 51.2   meanDistT: 53.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786998910224.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.1786998910224.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: 162°   stationPolarityCount: 21   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786998910224.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786998910224
Event info last updated: 2026.08.17-21:34:00 UTC
Event first association/location: 2026.08.17-20:47:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA