Early-est:     South Sandwich Islands Region    2026.06.19-21:08:31.24    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     fmamp_polarity_waveform:     hash:

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

Earthquake Details: Magnitude: mb: 4.9* [20]    Mwp: - [0]    Mwpd: - [0] Region: South Sandwich Islands Region Origin Time: 2026.06.19-21:08:31.24 UTC Hypocenter: lat: -59.29°  lon: -26.38°  [+/-16km]    depth: 165km  [+/-31km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 51   usedPhases: 28 minDist: 7.5°   maxDist: 151.3°   AzGap: 68°   2ndAzGap: 83°   atten: -1.45 [+/-0.61] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 16km   azMaxHorUnc: 180° 68%ConfEllipsoid:   semiMajorAxisLength: 31km   majorAxisAzimuth: 222°   majorAxisPlunge: 77°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 351°   intermediateAxisPlunge: 9°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.7s [14] Closest plate boundaries:    Sandwich / South America [subduction zone]: distance: ~110km    Antarctica - South America [oceanic transform fault]: distance: ~120km    Sandwich - Antarctica [oceanic transform fault]: distance: ~120km    Sandwich - Scotia [continental transform fault]: distance: ~150km 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 (110km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        165km        165km        165km 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)

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 237°   dip: 34°   rake: -69° Nodal Plane 2: strike: 32°   dip: 58°   rake: -104° Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 5.7   misfit: 0.07   stationDistributionRatio: 0.35   meanDistP: 43.6   meanDistT: 51.8   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
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
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 39°   dip: 53°   rake: -123° Nodal Plane 2: strike: 266°   dip: 47°   rake: -54° Quality: azimuthalGap: 82°   stationPolarityCount: 21   misfit: 0.29   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 34.74   fracAcc30degPref: 0.63   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1781903310446
Event info last updated: 2026.06.19-22:07:01 UTC
Event first association/location: 2026.06.19-21:17:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA