Early-est:     Nevada    2026.09.27-08:54:12.58    q:B      mb:4.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790499252035.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790499252035.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790499252035.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: 4.2* [11]    Mwp: - [0]    Mwpd: - [0]
Region: Nevada
Origin Time: 2026.09.27-08:54:12.58 UTC
Hypocenter: lat: 38.79°  lon: -115.29°  [+/-10km]    depth: 9km  [+/-10km]
Location Quality: qualityCode:  B     stdErr: 1.9s   assocPhases: 20   usedPhases: 15
minDist: 2.0°   maxDist: 94.7°   AzGap: 71°   2ndAzGap: 136°   atten: -0.34 [+/-0.54]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 10km   azMaxHorUnc: 120°
68%ConfEllipsoid:   semiMajorAxisLength: 13km   majorAxisAzimuth: 300°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 136°   intermediateAxisPlunge: 75°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 1.0 [10]    Td: -s [0]    Td*T50Ex: - [0]    To: 44.4s [10]
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:
       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.1790499252035.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 19°   dip: 7°   rake: -50°
Nodal Plane 2: strike: 159°   dip: 85°   rake: -94°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 5.3   misfit: 0.02   stationDistributionRatio: 0.40   meanDistP: 42.2   meanDistT: 44.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790499252035.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.1790499252035.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: 191°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790499252035.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790499252035
Event info last updated: 2026.09.27-09:53:00 UTC
Event first association/location: 2026.09.27-08:58:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA