Early-est:     Central Mid - Atlantic Ridge    2026.10.05-01:18:50.23    q:A      mb:5.1    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791163130534.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791163130534.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791163130534.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791163130534.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 [73]    Mwp: 5.5X [1]    Mwpd: - [0]
Region: Central Mid - Atlantic Ridge
Origin Time: 2026.10.05-01:18:50.23 UTC
Hypocenter: lat: -0.33°  lon: -19.99°  [+/-15km]    depth: 1km  [+/-16km]
Location Quality: qualityCode:  A     stdErr: 1.6s   assocPhases: 109   usedPhases: 85
minDist: 9.4°   maxDist: 153.6°   AzGap: 34°   2ndAzGap: 42°   atten: -1.39 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 168°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 164°   majorAxisPlunge: 18°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 44°   intermediateAxisPlunge: 57°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [58]    Td: 2.7Xs [2]    Td*T50Ex: - [0]    To: 10.3s [49]
Closest plate boundaries:
   Africa - South America [oceanic transform fault]: 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
 YES (30km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       1km
       1km
       1km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791163130534.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 168°   dip: 64°   rake: -5°
Nodal Plane 2: strike: 260°   dip: 85°   rake: -153°
Quality: azimuthalGap: -1°   stationPolarityCount: 77   misfitWeightCount: 9.7   misfit: 0.14   stationDistributionRatio: 0.30   meanDistP: 48.7   meanDistT: 41.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791163130534.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 243°   dip: 71°   rake: 179°
Nodal Plane 2: strike: 334°   dip: 89°   rake: 19°
Quality: azimuthalGap: 34°   stationPolarityCount: 77   misfit: 0.45   stationDistributionRatio: 0.66   rmsAngDiffAccPref: 52.74   fracAcc30degPref: 0.34   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791163130534.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.1791163130534.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.1791163130534.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791163130534
Event info last updated: 2026.10.05-02:19:03 UTC
Event first association/location: 2026.10.05-01:26:03 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI