Early-est:     South Sandwich Islands Region    2026.09.27-21:13:38.70    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790543619323.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790543619323.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790543619323.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: 5.1* [17]    Mwp: - [0]    Mwpd: - [0]
Region: South Sandwich Islands Region
Origin Time: 2026.09.27-21:13:38.70 UTC
Hypocenter: lat: -59.08°  lon: -25.88°  [+/-12km]    depth: 136km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 45   usedPhases: 23
minDist: 7.5°   maxDist: 156.6°   AzGap: 81°   2ndAzGap: 125°   atten: -1.46 [+/-0.62]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 12km   azMaxHorUnc: 11°
68%ConfEllipsoid:   semiMajorAxisLength: 15km   majorAxisAzimuth: 354°   majorAxisPlunge: 45°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 209°   intermediateAxisPlunge: 39°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.7s [14]
Closest plate boundaries:
   Sandwich / South America [subduction zone]: distance: ~90km
   Antarctica - South America [oceanic transform fault]: distance: ~150km
   Sandwich - Antarctica [oceanic transform fault]: distance: ~150km
   Sandwich - Scotia [continental transform fault]: distance: ~190km
Subduction geometry:    Zone: Scotia: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (90km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       136km
       136km
       136km
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.1790543619323.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 58°   dip: 39°   rake: -56°
Nodal Plane 2: strike: 198°   dip: 59°   rake: -114°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 3.8   misfit: 0.04   stationDistributionRatio: 0.41   meanDistP: 46.8   meanDistT: 50.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790543619323.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.1790543619323.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 89°   dip: 61°   rake: -80°
Nodal Plane 2: strike: 249°   dip: 30°   rake: -107°
Quality: azimuthalGap: 120°   stationPolarityCount: 17   misfit: 0.29   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 37.32   fracAcc30degPref: 0.50   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790543619323.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790543619323
Event info last updated: 2026.09.27-22:12:04 UTC
Event first association/location: 2026.09.27-21:22:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA