Early-est:     Near Coast of Northern Calif.    2026.06.24-15:10:43.40    q:A      mb:5.2    Mwp:5.8*    Mwpd:-    Td*T50Ex:1.6     fmamp_polarity:./hypo.1782313854095.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1782313854095.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1782313854095.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: 5.2 [76]    Mwp: 5.8* [46]    Mwpd: 5.9Xinv [36]
Region: Near Coast of Northern Calif.
Origin Time: 2026.06.24-15:10:43.40 UTC
Hypocenter: lat: 39.22°  lon: -123.45°  [+/-8km]    depth: 12km  [+/-9km]
Location Quality: qualityCode:  A     stdErr: 1.6s   assocPhases: 164   usedPhases: 75
minDist: 5.4°   maxDist: 152.1°   AzGap: 119°   2ndAzGap: 165°   atten: -0.90 [+/-0.16]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 8km   azMaxHorUnc: 116°
68%ConfEllipsoid:   semiMajorAxisLength: 10km   majorAxisAzimuth: 76°   majorAxisPlunge: 42°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 330°   intermediateAxisPlunge: 17°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [57]    Td: 3.9s [27]    Td*T50Ex: 1.6 [27]    To: 10.1s [52]
Closest plate boundaries:
   North America - Pacific [continental transform fault]: distance: ~30km
   Pacific - Juan de Fuca [oceanic transform fault]: distance: ~160km
   Juan de Fuca \ North America [subduction zone]: distance: ~160km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (160km)
 no
 YES (30km)
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   1.6
   1.6
   1.6
Td*To:
     39.4
     39.4
     39.4
Mwp magnitude:
       5.8*
       5.8*
       5.8*
Hypocenter depth:
       12km
       12km
       12km
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.1782313854095.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 145°   dip: 33°   rake: 44°
Nodal Plane 2: strike: 16°   dip: 68°   rake: 115°
Quality: azimuthalGap: -1°   stationPolarityCount: 71   misfitWeightCount: 12.8   misfit: 0.07   stationDistributionRatio: 0.41   meanDistP: 36.3   meanDistT: 30.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1782313854095.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 145°   dip: 22°   rake: 32°
Nodal Plane 2: strike: 26°   dip: 79°   rake: 109°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 4.8   misfit: 0.00   stationDistributionRatio: 0.39   meanDistP: 45.7   meanDistT: 39.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1782313854095.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: 164°   stationPolarityCount: 71   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1782313854095.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1782313854095
Event info last updated: 2026.06.24-16:09:02 UTC
Event first association/location: 2026.06.24-15:14:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA