Early-est:     Southern Mid - Atlantic Ridge    2025.08.06-23:27:06.80    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754522826762.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754522826762.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754522826762.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.8* [9]    Mwp: - [0]    Mwpd: - [0]
Region: Southern Mid - Atlantic Ridge
Origin Time: 2025.08.06-23:27:06.80 UTC
Hypocenter: lat: -46.05°  lon: -16.13°  [+/-11km]    depth: 99km  [+/-18km]
Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 35   usedPhases: 14
minDist: 26.4°   maxDist: 90.8°   AzGap: 84°   2ndAzGap: 104°   atten: 2.79 [+/-2.32]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 11km   azMaxHorUnc: 110°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 127°   majorAxisPlunge: 77°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 250°   intermediateAxisPlunge: 7°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 6.3s [10]
Closest plate boundaries:
   Africa - South America [oceanic transform fault]: distance: ~80km
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:
       99km
       99km
       99km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1754522826762.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 17°   dip: 29°   rake: 150°
Nodal Plane 2: strike: 133°   dip: 76°   rake: 64°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 7.1   misfit: 0.11   stationDistributionRatio: 0.38   meanDistP: 52.6   meanDistT: 45.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754522826762.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: 0°
Nodal Plane 2: strike: 270°   dip: 90°   rake: 90°
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/_polarity_waveform
./hypo.1754522826762.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 59°   dip: 85°   rake: 120°
Nodal Plane 2: strike: 159°   dip: 30°   rake: 10°
Quality: azimuthalGap: 83°   stationPolarityCount: 15   misfit: 0.18   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 36.78   fracAcc30degPref: 0.52   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754522826762.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754522826762
Event info last updated: 2025.08.07-00:26:00 UTC
Event first association/location: 2025.08.06-23:38:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA