Early-est: Central Mid - Atlantic Ridge 2026.10.13-12:23:08.34 q:A mb:5.4 Mwp:6.5 Mwpd:- Td*T50Ex:3.0 fmamp_polarity: hash: fmamp_amp_aref: fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude:	mb: 5.4 [109] Mwp: 6.5 [56] Mwpd: 6.6Xinv [58]
Region:	Central Mid - Atlantic Ridge
Origin Time:	2026.10.13-12:23:08.34 UTC
Hypocenter:	lat: -0.29° lon: -19.29° [+/-15km] depth: 1km [+/-17km]
Location Quality:	qualityCode: A stdErr: 1.3s assocPhases: 175 usedPhases: 125 minDist: 9.1° maxDist: 155.2° AzGap: 62° 2ndAzGap: 70° atten: -1.54 [+/-0.28]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 14km maxHorUnc: 15km azMaxHorUnc: 125° 68%ConfEllipsoid: semiMajorAxisLength: 19km majorAxisAzimuth: 128° majorAxisPlunge: 27° semiIntermediateAxisLength: 17km intermediateAxisAzimuth: 221° intermediateAxisPlunge: 5° semiMinorAxisLength: 16km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: >99%
T50Ex: 0.9 [101] Td: 3.5s [11] Td*T50Ex: 3.0 [11] To: 61.9s [94]
Closest plate boundaries:
Africa - South America [oceanic transform fault]: distance: ~40km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

YES (40km)

Prob underwater:

>99%

Td*T50Ex:

3.0

Td*To:

216.7

Mwp magnitude:

6.5

Hypocenter depth:

1km

Slab depth at epicenter:

n/a

First-motion Focal Mechanism (FMAMP_POLARITY): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 71° dip: 81° rake: 172°
Nodal Plane 2:	strike: 162° dip: 82° rake: 9°
Quality:	azimuthalGap: -1° stationPolarityCount: 129 misfitWeightCount: 12.7 misfit: 0.13 stationDistributionRatio: 0.30 meanDistP: 54.3 meanDistT: 27.7 qualityCode: D
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity

./hypo.1791894200837.mech.fmamp_polarity.mechanism.jpg

First-motion Focal Mechanism (HASH): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 171° dip: 40° rake: 34°
Nodal Plane 2:	strike: 54° dip: 69° rake: 125°
Quality:	azimuthalGap: 62° stationPolarityCount: 130 misfit: 0.19 stationDistributionRatio: 0.67 rmsAngDiffAccPref: 40.43 fracAcc30degPref: 0.50 qualityCode: D
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1791894200837.mech.hash.mechanism.jpg

First-motion Focal Mechanism (FMAMP_AMP_AREF): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 41° dip: 65° rake: 175°
Nodal Plane 2:	strike: 133° dip: 86° rake: 25°
Quality:	azimuthalGap: -1° stationPolarityCount: 53 misfitWeightCount: 3.2 misfit: 9999.90 stationDistributionRatio: 0.49 meanDistP: 51.5 meanDistT: 34.0 qualityCode: D
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref

./hypo.1791894200837.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.1791894200837.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791894200837
Event info last updated: 2026.10.13-13:24:05 UTC
Event first association/location: 2026.10.13-12:31:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI

Early-est: Central Mid - Atlantic Ridge 2026.10.13-12:23:08.34 q:A mb:5.4 Mwp:6.5 Mwpd:- Td*T50Ex:3.0 fmamp_polarity: hash: fmamp_amp_aref: fmamp_amp_mwp:

Automatic solution - this event has not been reviewed by a seismologist Automatically determined event information may be incorrect!

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!