Early-est:     Andreanof Islands, Aleutian Is.    2026.06.18-13:58:28.82    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781791108714.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781791108714.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781791108714.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: 4.9* [29]    Mwp: 4.8X [1]    Mwpd: - [0]
Region: Andreanof Islands, Aleutian Is.
Origin Time: 2026.06.18-13:58:28.82 UTC
Hypocenter: lat: 51.46°  lon: -179.37°  [+/-23km]    depth: 15km  [+/-21km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 65   usedPhases: 38
minDist: 3.3°   maxDist: 157.7°   AzGap: 73°   2ndAzGap: 116°   atten: -1.52 [+/-0.62]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 23km   azMaxHorUnc: 178°
68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 359°   majorAxisPlunge: 16°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 149°   intermediateAxisPlunge: 72°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [17]    Td: 4.5Xs [1]    Td*T50Ex: - [0]    To: 1.7s [16]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~110km
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 (110km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1781791108714.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 335°   dip: 20°   rake: 108°
Nodal Plane 2: strike: 136°   dip: 71°   rake: 84°
Quality: azimuthalGap: -1°   stationPolarityCount: 28   misfitWeightCount: 4.8   misfit: 0.15   stationDistributionRatio: 0.38   meanDistP: 55.2   meanDistT: 50.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781791108714.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.1781791108714.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 131°   dip: 73°   rake: 111°
Nodal Plane 2: strike: 259°   dip: 27°   rake: 41°
Quality: azimuthalGap: 142°   stationPolarityCount: 28   misfit: 0.23   stationDistributionRatio: 0.59   rmsAngDiffAccPref: 39.92   fracAcc30degPref: 0.53   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781791108714.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781791108714
Event info last updated: 2026.06.18-14:57:01 UTC
Event first association/location: 2026.06.18-14:12:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA