Early-est:     South Sandwich Islands Region    2026.06.20-04:44:15.12    q:B      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781930653878.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781930653878.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781930653878.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: 5.0* [21]    Mwp: - [0]    Mwpd: - [0]
Region: South Sandwich Islands Region
Origin Time: 2026.06.20-04:44:15.12 UTC
Hypocenter: lat: -57.83°  lon: -25.35°  [+/-13km]    depth: 96km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 49   usedPhases: 37
minDist: 7.1°   maxDist: 152.6°   AzGap: 45°   2ndAzGap: 69°   atten: -0.95 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 13km   azMaxHorUnc: 3°
68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 337°   majorAxisPlunge: 64°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 202°   intermediateAxisPlunge: 19°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [9]    Td: -s [0]    Td*T50Ex: - [0]    To: 19.7s [8]
Closest plate boundaries:
   Sandwich / South America [subduction zone]: distance: ~90km
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:
       96km
       96km
       96km
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.1781930653878.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 101°   dip: 46°   rake: -131°
Nodal Plane 2: strike: 331°   dip: 57°   rake: -56°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 8.8   misfit: 0.13   stationDistributionRatio: 0.55   meanDistP: 50.4   meanDistT: 35.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781930653878.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.1781930653878.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 117°   dip: 37°   rake: -109°
Nodal Plane 2: strike: 321°   dip: 55°   rake: -76°
Quality: azimuthalGap: 48°   stationPolarityCount: 22   misfit: 0.35   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 35.17   fracAcc30degPref: 0.59   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781930653878.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781930653878
Event info last updated: 2026.06.20-05:43:00 UTC
Event first association/location: 2026.06.20-04:54:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA