Early-est:     Western Australia    2026.08.11-18:10:26.57    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786471827725.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786471827725.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786471827725.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* [15]    Mwp: - [0]    Mwpd: - [0]
Region: Western Australia
Origin Time: 2026.08.11-18:10:26.57 UTC
Hypocenter: lat: -31.20°  lon: 126.44°  [+/-13km]    depth: 9km  [+/-13km]
Location Quality: qualityCode:  B     stdErr: 2.1s   assocPhases: 44   usedPhases: 20
minDist: 1.5°   maxDist: 93.3°   AzGap: 67°   2ndAzGap: 132°   atten: -0.59 [+/-0.33]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 9°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 6°   majorAxisPlunge: 9°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 270°   intermediateAxisPlunge: 33°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.7 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 35.9s [11]
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.1786471827725.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 195°   dip: 22°   rake: 63°
Nodal Plane 2: strike: 44°   dip: 70°   rake: 100°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 5.7   misfit: 0.22   stationDistributionRatio: 0.55   meanDistP: 51.7   meanDistT: 44.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786471827725.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.1786471827725.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 248°   dip: 23°   rake: 93°
Nodal Plane 2: strike: 64°   dip: 67°   rake: 89°
Quality: azimuthalGap: 70°   stationPolarityCount: 17   misfit: 0.40   stationDistributionRatio: 0.74   rmsAngDiffAccPref: 39.86   fracAcc30degPref: 0.50   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786471827725.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786471827725
Event info last updated: 2026.08.11-19:09:00 UTC
Event first association/location: 2026.08.11-18:14:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA