Early-est:     Vancouver Island, Canada Region    2026.09.28-09:13:44.99    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:1.0     fmamp_polarity:./hypo.1790586824181.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790586824181.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790586824181.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* [26]    Mwp: 5.4X [2]    Mwpd: 5.6Xinv [2]
Region: Vancouver Island, Canada Region
Origin Time: 2026.09.28-09:13:44.99 UTC
Hypocenter: lat: 50.23°  lon: -129.60°  [+/-27km]    depth: 32km  [+/-24km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 66   usedPhases: 28
minDist: 5.7°   maxDist: 151.2°   AzGap: 118°   2ndAzGap: 179°   atten: -0.58 [+/-0.51]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 27km   azMaxHorUnc: 56°
68%ConfEllipsoid:   semiMajorAxisLength: 34km   majorAxisAzimuth: 55°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 24km   intermediateAxisAzimuth: 281°   intermediateAxisPlunge: 71°   semiMinorAxisLength: 19km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [24]    Td: 2.8s [10]    Td*T50Ex: 1.0 [10]    To: 10.7s [24]
Closest plate boundaries:
   Pacific - Juan de Fuca [oceanic transform fault]: distance: ~40km
   Juan de Fuca \ North America [subduction zone]: distance: ~50km
   North America - Pacific [continental convergent boundary]: distance: ~180km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (50km)
 no
 YES (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.0
   1.0
   1.0
Td*To:
     30.0
     30.0
     30.0
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       32km
       32km
       32km
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.1790586824181.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 83°   dip: 46°   rake: -63°
Nodal Plane 2: strike: 227°   dip: 50°   rake: -116°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 7.5   misfit: 0.09   stationDistributionRatio: 0.51   meanDistP: 44.6   meanDistT: 38.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790586824181.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.1790586824181.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 28°   dip: 87°   rake: -168°
Nodal Plane 2: strike: 297°   dip: 78°   rake: -3°
Quality: azimuthalGap: 118°   stationPolarityCount: 26   misfit: 0.30   stationDistributionRatio: 0.57   rmsAngDiffAccPref: 25.08   fracAcc30degPref: 0.81   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790586824181.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790586824181
Event info last updated: 2026.09.28-10:12:00 UTC
Event first association/location: 2026.09.28-09:18:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA