Early-est: Central Mid - Atlantic Ridge 2026.10.13-05:44:54.90 q:B mb:5.2 Mwp:6.7 Mwpd:- Td*T50Ex:3.4 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: 5.2 [63] Mwp: 6.7 [23] Mwpd: 6.6Xinv [15]
Region:	Central Mid - Atlantic Ridge
Origin Time:	2026.10.13-05:44:54.90 UTC
Hypocenter:	lat: -0.51° lon: -19.29° [+/-23km] depth: 20km [+/-15km]
Location Quality:	qualityCode: B stdErr: 2.1s assocPhases: 125 usedPhases: 56 minDist: 8.9° maxDist: 166.4° AzGap: 58° 2ndAzGap: 76° atten: -0.97 [+/-0.30]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 13km maxHorUnc: 23km azMaxHorUnc: 128° 68%ConfEllipsoid: semiMajorAxisLength: 28km majorAxisAzimuth: 128° majorAxisPlunge: 4° semiIntermediateAxisLength: 17km intermediateAxisAzimuth: 36° intermediateAxisPlunge: 25° semiMinorAxisLength: 14km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: >99%
T50Ex: 0.8 [49] Td: 4.5s [12] Td*T50Ex: 3.4 [12] To: 57.5s [32]
Closest plate boundaries:
Africa - South America [oceanic transform fault]: distance: ~50km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

YES (50km)

Prob underwater:

>99%

Td*T50Ex:

3.4

Td*To:

258.8

Mwp magnitude:

6.7

Hypocenter depth:

20km

Slab depth at epicenter:

n/a

First-motion Focal Mechanism (FMAMP_POLARITY): (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1:	strike: 241° dip: 30° rake: 83°
Nodal Plane 2:	strike: 69° dip: 60° rake: 94°
Quality:	azimuthalGap: -1° stationPolarityCount: 72 misfitWeightCount: 11.9 misfit: 0.22 stationDistributionRatio: 0.47 meanDistP: 34.8 meanDistT: 23.4 qualityCode: C
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity

./hypo.1791870307595.mech.fmamp_polarity.mechanism.jpg

First-motion Focal Mechanism (HASH): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 317° dip: 77° rake: 110°
Nodal Plane 2:	strike: 77° dip: 24° rake: 33°
Quality:	azimuthalGap: 59° stationPolarityCount: 72 misfit: 0.33 stationDistributionRatio: 0.71 rmsAngDiffAccPref: 42.80 fracAcc30degPref: 0.35 qualityCode: D
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1791870307595.mech.hash.mechanism.jpg

First-motion Focal Mechanism (FMAMP_AMP_AREF): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 270° dip: 71° rake: -164°
Nodal Plane 2:	strike: 174° dip: 75° rake: -20°
Quality:	azimuthalGap: -1° stationPolarityCount: 22 misfitWeightCount: 4.6 misfit: 9999.90 stationDistributionRatio: 0.49 meanDistP: 39.7 meanDistT: 53.0 qualityCode: D
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref

./hypo.1791870307595.mech.fmamp_amp_aref.mechanism.jpg

First-motion Focal Mechanism (FMAMP_AMP_MWP): (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1:	strike: 166° dip: 39° rake: 18°
Nodal Plane 2:	strike: 62° dip: 79° rake: 128°
Quality:	azimuthalGap: -1° stationPolarityCount: 19 misfitWeightCount: 4.3 misfit: 9999.90 stationDistributionRatio: 0.24 meanDistP: 40.5 meanDistT: 27.7 qualityCode: C
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

./hypo.1791870307595.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791870307595
Event info last updated: 2026.10.13-06:45:04 UTC
Event first association/location: 2026.10.13-05:53:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI

Early-est: Central Mid - Atlantic Ridge 2026.10.13-05:44:54.90 q:B mb:5.2 Mwp:6.7 Mwpd:- Td*T50Ex:3.4 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!