Early-est: Central Mid - Atlantic Ridge 2025.01.31-09:04:52.49 q:B mb:5.1 Mwp:5.9 Mwpd:- Td*T50Ex:1.5 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: 5.1 [77] Mwp: 5.9 [33] Mwpd: 5.8Xinv [21]
Region:	Central Mid - Atlantic Ridge
Origin Time:	2025.01.31-09:04:52.49 UTC
Hypocenter:	lat: 0.65° lon: -25.11° [+/-19km] depth: 1km [+/-17km]
Location Quality:	qualityCode: B stdErr: 1.4s assocPhases: 163 usedPhases: 109 minDist: 12.6° maxDist: 152.2° AzGap: 27° 2ndAzGap: 33° atten: -0.42 [+/-0.49]
Location Uncertainty:	68%ConfEllipse: minHorUnc: 15km maxHorUnc: 19km azMaxHorUnc: 23° 68%ConfEllipsoid: semiMajorAxisLength: 24km majorAxisAzimuth: 19° majorAxisPlunge: 20° semiIntermediateAxisLength: 19km intermediateAxisAzimuth: 281° intermediateAxisPlunge: 22° semiMinorAxisLength: 15km

Tsunamigeneic Assesment:

Discriminants:

Prob Underwater: >99%
T50Ex: 0.3 [29] Td: 4.5s [7] Td*T50Ex: 1.5 [7] To: 4.4s [27]
Closest plate boundaries:
Africa - South America [oceanic transform fault]: distance: ~10km
Subduction geometry: none or not available

Decision table (TEST!):

Event type:

Subduction Zone

Other Thrust/Normal

Strike-slip

Compatible close plate boundary?:

YES (10km)

Prob underwater:

>99%

Td*T50Ex:

1.5

Td*To:

19.8

Mwp magnitude:

5.9

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: 154° dip: 71° rake: -10°
Nodal Plane 2:	strike: 247° dip: 80° rake: -161°
Quality:	azimuthalGap: -1° stationPolarityCount: 107 misfitWeightCount: 12.4 misfit: 0.17 stationDistributionRatio: 0.33 meanDistP: 33.5 meanDistT: 53.0 qualityCode: D
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity

./hypo.1738314291643.mech.fmamp_polarity.mechanism.jpg

First-motion Focal Mechanism (HASH): (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1:	strike: 267° dip: 69° rake: 177°
Nodal Plane 2:	strike: 358° dip: 87° rake: 21°
Quality:	azimuthalGap: 33° stationPolarityCount: 107 misfit: 0.46 stationDistributionRatio: 0.64 rmsAngDiffAccPref: 48.86 fracAcc30degPref: 0.36 qualityCode: D
Method:	methodID: smi:gov.usgs/focalmec/HASH_1.2

./hypo.1738314291643.mech.hash.mechanism.jpg

First-motion Focal Mechanism (FMAMP_AMP_AREF): (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1:	strike: 137° dip: 10° rake: 4°
Nodal Plane 2:	strike: 43° dip: 89° rake: 100°
Quality:	azimuthalGap: -1° stationPolarityCount: 35 misfitWeightCount: 5.4 misfit: 9999.90 stationDistributionRatio: 0.30 meanDistP: 23.9 meanDistT: 36.3 qualityCode: C
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref

./hypo.1738314291643.mech.fmamp_amp_aref.mechanism.jpg

First-motion Focal Mechanism (FMAMP_AMP_MWP): (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1:	strike: 163° dip: 70° rake: -11°
Nodal Plane 2:	strike: 257° dip: 79° rake: -160°
Quality:	azimuthalGap: -1° stationPolarityCount: 29 misfitWeightCount: 5.6 misfit: 9999.90 stationDistributionRatio: 0.35 meanDistP: 28.0 meanDistT: 26.8 qualityCode: C
Method:	methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_mwp

./hypo.1738314291643.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738314291643
Event info last updated: 2025.01.31-10:05:08 UTC
Event first association/location: 2025.01.31-09:13:31 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI

Early-est: Central Mid - Atlantic Ridge 2025.01.31-09:04:52.49 q:B mb:5.1 Mwp:5.9 Mwpd:- Td*T50Ex:1.5 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!