Early-est:     Mid - Indian Ridge    2026.04.04-04:55:44.56    q:C      mb:5.0*    Mwp:5.5    Mwpd:-    Td*T50Ex:0.9     fmamp_polarity:./hypo.1775278544440.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775278544440.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775278544440.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: 5.0* [68]    Mwp: 5.5 [5]    Mwpd: 5.4Xinv [2]
Region: Mid - Indian Ridge
Origin Time: 2026.04.04-04:55:44.56 UTC
Hypocenter: lat: -21.66°  lon: 68.87°  [+/-30km]    depth: 99km  [+/-71km]
Location Quality: qualityCode:  C     stdErr: 1.4s   assocPhases: 114   usedPhases: 70
minDist: 20.4°   maxDist: 166.1°   AzGap: 44°   2ndAzGap: 46°   atten: -0.60 [+/-0.36]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 25km   maxHorUnc: 30km   azMaxHorUnc: 175°
68%ConfEllipsoid:   semiMajorAxisLength: 71km   majorAxisAzimuth: 97°   majorAxisPlunge: 88°   semiIntermediateAxisLength: 37km   intermediateAxisAzimuth: 355°   intermediateAxisPlunge: 0°   semiMinorAxisLength: 30km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [35]    Td: 2.7s [5]    Td*T50Ex: 0.9 [5]    To: 2.5s [34]
Closest plate boundaries:
   Australia - Somalia [oceanic spreading ridge]: distance: ~30km
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:
   0.9
   0.9
   0.9
Td*To:
     6.8
     6.8
     6.8
Mwp magnitude:
       5.5
       5.5
       5.5
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.1775278544440.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 182°   dip: 71°   rake: -161°
Nodal Plane 2: strike: 85°   dip: 72°   rake: -20°
Quality: azimuthalGap: -1°   stationPolarityCount: 56   misfitWeightCount: 10.5   misfit: 0.21   stationDistributionRatio: 0.44   meanDistP: 46.4   meanDistT: 48.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775278544440.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.1775278544440.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 189°   dip: 73°   rake: 176°
Nodal Plane 2: strike: 280°   dip: 87°   rake: 17°
Quality: azimuthalGap: 43°   stationPolarityCount: 56   misfit: 0.42   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 41.33   fracAcc30degPref: 0.47   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775278544440.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775278544440
Event info last updated: 2026.04.04-05:54:00 UTC
Event first association/location: 2026.04.04-05:05:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA