Early-est:     Western Indian - Antarctic Ridge    2026.03.30-10:14:25.25    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774865667820.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774865667820.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774865667820.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: 4.9* [25]    Mwp: - [0]    Mwpd: - [0]
Region: Western Indian - Antarctic Ridge
Origin Time: 2026.03.30-10:14:25.25 UTC
Hypocenter: lat: -47.71°  lon: 115.90°  [+/-16km]    depth: 30km  [+/-21km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 48   usedPhases: 35
minDist: 14.8°   maxDist: 157.1°   AzGap: 46°   2ndAzGap: 87°   atten: -1.04 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 16km   azMaxHorUnc: 134°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 306°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 147°   intermediateAxisPlunge: 34°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.2s [13]
Closest plate boundaries:
   Australia - Antarctica [oceanic spreading ridge]: distance: ~180km
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:
       30km
       30km
       30km
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.1774865667820.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 148°   dip: 9°   rake: -178°
Nodal Plane 2: strike: 56°   dip: 90°   rake: -81°
Quality: azimuthalGap: -1°   stationPolarityCount: 24   misfitWeightCount: 5.7   misfit: 0.07   stationDistributionRatio: 0.33   meanDistP: 47.0   meanDistT: 48.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774865667820.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.1774865667820.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 300°   dip: 11°   rake: -27°
Nodal Plane 2: strike: 57°   dip: 85°   rake: -100°
Quality: azimuthalGap: 92°   stationPolarityCount: 24   misfit: 0.32   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 33.79   fracAcc30degPref: 0.58   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774865667820.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774865667820
Event info last updated: 2026.03.30-11:13:00 UTC
Event first association/location: 2026.03.30-10:23:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA