Early-est:     Western Arizona    2026.02.11-08:39:06.42    q:C      mb:3.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770799146526.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770799146526.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770799146526.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: 3.8* [5]    Mwp: - [0]    Mwpd: - [0]
Region: Western Arizona
Origin Time: 2026.02.11-08:39:06.42 UTC
Hypocenter: lat: 33.77°  lon: -113.31°  [+/-25km]    depth: 99km  [+/-20km]
Location Quality: qualityCode:  C     stdErr: 1.5s   assocPhases: 13   usedPhases: 9
minDist: 2.4°   maxDist: 144.4°   AzGap: 200°   2ndAzGap: 244°   atten: -1.54 [+/-0.57]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 25km   azMaxHorUnc: 62°
68%ConfEllipsoid:   semiMajorAxisLength: 31km   majorAxisAzimuth: 243°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 352°   intermediateAxisPlunge: 61°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 3.0X [1]    Td: -s [0]    Td*T50Ex: - [0]    To: 203.2Xs [1]
Closest plate boundaries:
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       99km
       99km
       99km
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.1770799146526.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 38°   dip: 35°   rake: -100°
Nodal Plane 2: strike: 230°   dip: 55°   rake: -83°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 4.7   misfit: 0.00   stationDistributionRatio: 0.53   meanDistP: 47.3   meanDistT: 51.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770799146526.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.1770799146526.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 25°   dip: 33°   rake: -109°
Nodal Plane 2: strike: 228°   dip: 59°   rake: -78°
Quality: azimuthalGap: 78°   stationPolarityCount: 9   misfit: 0.00   stationDistributionRatio: 0.55   rmsAngDiffAccPref: 37.52   fracAcc30degPref: 0.51   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770799146526.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770799146526
Event info last updated: 2026.02.11-09:38:00 UTC
Event first association/location: 2026.02.11-08:44:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA