Early-est:     Central California    2026.04.02-08:41:27.87    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1775119284750.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775119284750.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775119284750.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: 4.7* [22]    Mwp: - [0]    Mwpd: - [0]
Region: Central California
Origin Time: 2026.04.02-08:41:27.87 UTC
Hypocenter: lat: 36.84°  lon: -122.33°  [+/-34km]    depth: 14km  [+/-14km]
Location Quality: qualityCode:  C     stdErr: 2.4s   assocPhases: 49   usedPhases: 23
minDist: 4.9°   maxDist: 150.2°   AzGap: 121°   2ndAzGap: 179°   atten: -0.72 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 34km   azMaxHorUnc: 66°
68%ConfEllipsoid:   semiMajorAxisLength: 44km   majorAxisAzimuth: 246°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 147°   intermediateAxisPlunge: 31°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [17]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.7s [17]
Closest plate boundaries:
   North America - Pacific [continental transform fault]: distance: ~50km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 YES (50km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       14km
       14km
       14km
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.1775119284750.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 104°   dip: 45°   rake: -40°
Nodal Plane 2: strike: 225°   dip: 63°   rake: -128°
Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 7.7   misfit: 0.10   stationDistributionRatio: 0.55   meanDistP: 39.0   meanDistT: 48.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775119284750.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.1775119284750.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: 179°   stationPolarityCount: 21   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775119284750.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775119284750
Event info last updated: 2026.04.02-09:40:00 UTC
Event first association/location: 2026.04.02-08:47:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA