Early-est:     Chagos Archipelago Region    2026.10.07-14:59:27.60    q:A      mb:5.1    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791385168515.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791385168515.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791385168515.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791385168515.mech.fmamp_amp_mwp.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 [62]    Mwp: - [0]    Mwpd: - [0]
Region: Chagos Archipelago Region
Origin Time: 2026.10.07-14:59:27.60 UTC
Hypocenter: lat: -6.67°  lon: 72.18°  [+/-13km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 114   usedPhases: 80
minDist: 0.8°   maxDist: 157.1°   AzGap: 46°   2ndAzGap: 54°   atten: -0.79 [+/-0.43]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 175°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 351°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 250°   intermediateAxisPlunge: 43°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [41]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.4s [39]
Closest plate boundaries:
   India - Australia [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:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791385168515.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 9°   dip: 15°   rake: 115°
Nodal Plane 2: strike: 162°   dip: 77°   rake: 84°
Quality: azimuthalGap: -1°   stationPolarityCount: 68   misfitWeightCount: 8.4   misfit: 0.21   stationDistributionRatio: 0.38   meanDistP: 44.4   meanDistT: 47.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791385168515.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 187°   dip: 61°   rake: 165°
Nodal Plane 2: strike: 284°   dip: 77°   rake: 30°
Quality: azimuthalGap: 53°   stationPolarityCount: 68   misfit: 0.42   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 45.04   fracAcc30degPref: 0.56   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791385168515.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_aref
./hypo.1791385168515.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_mwp
./hypo.1791385168515.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791385168515
Event info last updated: 2026.10.07-15:59:52 UTC
Event first association/location: 2026.10.07-15:06:46 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI