Early-est:     Western Indian - Antarctic Ridge    2025.08.03-15:48:09.20    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754236088696.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754236088696.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754236088696.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: 5.1* [37]    Mwp: 6.0X [1]    Mwpd: 6.1Xinv [1]
Region: Western Indian - Antarctic Ridge
Origin Time: 2025.08.03-15:48:09.20 UTC
Hypocenter: lat: -47.82°  lon: 115.94°  [+/-19km]    depth: 15km  [+/-37km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 91   usedPhases: 61
minDist: 14.9°   maxDist: 161.8°   AzGap: 46°   2ndAzGap: 77°   atten: -1.05 [+/-0.41]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 16km   maxHorUnc: 19km   azMaxHorUnc: 165°
68%ConfEllipsoid:   semiMajorAxisLength: 37km   majorAxisAzimuth: 317°   majorAxisPlunge: 81°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 169°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 20km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [25]    Td: 5.4Xs [2]    Td*T50Ex: - [0]    To: 4.3s [24]
Closest plate boundaries:
   Australia - Antarctica [oceanic spreading ridge]: distance: ~170km
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:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1754236088696.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 28°   dip: 45°   rake: -62°
Nodal Plane 2: strike: 171°   dip: 51°   rake: -116°
Quality: azimuthalGap: -1°   stationPolarityCount: 30   misfitWeightCount: 8.3   misfit: 0.14   stationDistributionRatio: 0.38   meanDistP: 43.1   meanDistT: 50.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754236088696.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.1754236088696.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 149°   dip: 80°   rake: -180°
Nodal Plane 2: strike: 59°   dip: 90°   rake: -10°
Quality: azimuthalGap: 77°   stationPolarityCount: 30   misfit: 0.33   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 16.80   fracAcc30degPref: 0.98   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754236088696.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754236088696
Event info last updated: 2025.08.03-16:47:00 UTC
Event first association/location: 2025.08.03-15:55:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA