Early-est:     Rat Islands, Aleutian Islands    2026.04.03-08:22:12.40    q:B      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775204533862.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775204533862.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775204533862.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* [53]    Mwp: - [0]    Mwpd: - [0]
Region: Rat Islands, Aleutian Islands
Origin Time: 2026.04.03-08:22:12.40 UTC
Hypocenter: lat: 52.28°  lon: 176.62°  [+/-14km]    depth: 5km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 1.8s   assocPhases: 88   usedPhases: 63
minDist: 1.6°   maxDist: 151.4°   AzGap: 71°   2ndAzGap: 129°   atten: -0.73 [+/-0.42]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 177°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 356°   majorAxisPlunge: 9°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 192°   intermediateAxisPlunge: 81°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [31]    Td: 2.5Xs [2]    Td*T50Ex: - [0]    To: 2.6s [31]
Closest plate boundaries:
   North America / Pacific [subduction zone]: distance: ~150km
   Okhotsk / Pacific [subduction zone]: distance: ~890km
   Okhotsk / North America [subduction zone]: distance: ~890km
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 (150km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       5km
       5km
       5km
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.1775204533862.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 323°   dip: 44°   rake: 158°
Nodal Plane 2: strike: 69°   dip: 75°   rake: 48°
Quality: azimuthalGap: -1°   stationPolarityCount: 54   misfitWeightCount: 6.0   misfit: 0.11   stationDistributionRatio: 0.50   meanDistP: 53.0   meanDistT: 45.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775204533862.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.1775204533862.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 230°   dip: 42°   rake: 82°
Nodal Plane 2: strike: 61°   dip: 49°   rake: 97°
Quality: azimuthalGap: 84°   stationPolarityCount: 52   misfit: 0.27   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 40.19   fracAcc30degPref: 0.46   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775204533862.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775204533862
Event info last updated: 2026.04.03-09:21:00 UTC
Event first association/location: 2026.04.03-08:31:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA