Early-est:     Vancouver Island, Canada Region    2026.09.28-04:41:27.66    q:B      mb:5.1*    Mwp:5.5    Mwpd:-    Td*T50Ex:1.2     fmamp_polarity:./hypo.1790570492262.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790570492262.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790570492262.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: 5.1* [35]    Mwp: 5.5 [12]    Mwpd: 5.7Xinv [15]
Region: Vancouver Island, Canada Region
Origin Time: 2026.09.28-04:41:27.66 UTC
Hypocenter: lat: 50.08°  lon: -129.57°  [+/-23km]    depth: 9km  [+/-18km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 67   usedPhases: 31
minDist: 5.8°   maxDist: 77.6°   AzGap: 164°   2ndAzGap: 179°   atten: -1.15 [+/-0.43]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 23km   azMaxHorUnc: 40°
68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 40°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 192°   intermediateAxisPlunge: 85°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [30]    Td: 3.4s [19]    Td*T50Ex: 1.2 [19]    To: 6.7s [27]
Closest plate boundaries:
   Pacific - Juan de Fuca [oceanic spreading ridge]: distance: ~40km
   Juan de Fuca \ North America [subduction zone]: distance: ~60km
   North America - Pacific [continental convergent boundary]: distance: ~190km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (60km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.2
   1.2
   1.2
Td*To:
     22.8
     22.8
     22.8
Mwp magnitude:
       5.5
       5.5
       5.5
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.1790570492262.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 110°   dip: 43°   rake: 114°
Nodal Plane 2: strike: 258°   dip: 51°   rake: 69°
Quality: azimuthalGap: -1°   stationPolarityCount: 30   misfitWeightCount: 7.6   misfit: 0.08   stationDistributionRatio: 0.34   meanDistP: 50.0   meanDistT: 49.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790570492262.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.1790570492262.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: 163°   stationPolarityCount: 30   misfit: 0.99   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 31.91   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790570492262.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790570492262
Event info last updated: 2026.09.28-05:40:00 UTC
Event first association/location: 2026.09.28-04:46:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA