Early-est:     Off Coast of Northern California    2026.02.05-12:49:35.23    q:A      mb:4.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770295772335.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770295772335.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770295772335.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: 4.4* [18]    Mwp: - [0]    Mwpd: - [0]
Region: Off Coast of Northern California
Origin Time: 2026.02.05-12:49:35.23 UTC
Hypocenter: lat: 40.67°  lon: -125.38°  [+/-8km]    depth: 9km  [+/-7km]
Location Quality: qualityCode:  A     stdErr: 0.7s   assocPhases: 21   usedPhases: 17
minDist: 4.2°   maxDist: 35.6°   AzGap: 194°   2ndAzGap: 206°   atten: -1.06 [+/-0.60]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 8km   azMaxHorUnc: 74°
68%ConfEllipsoid:   semiMajorAxisLength: 10km   majorAxisAzimuth: 74°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 164°   intermediateAxisPlunge: 6°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 7.2s [14]
Closest plate boundaries:
   Pacific - Juan de Fuca [oceanic transform fault]: distance: ~40km
   Juan de Fuca \ North America [subduction zone]: distance: ~40km
   North America - Pacific [continental transform fault]: distance: ~90km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (40km)
 no
 YES (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
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.1770295772335.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 152°   dip: 28°   rake: 24°
Nodal Plane 2: strike: 41°   dip: 79°   rake: 116°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 5.2   misfit: 0.10   stationDistributionRatio: 0.41   meanDistP: 50.8   meanDistT: 41.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770295772335.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.1770295772335.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: 205°   stationPolarityCount: 19   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770295772335.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770295772335
Event info last updated: 2026.02.05-13:48:26 UTC
Event first association/location: 2026.02.05-12:54:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA