Early-est:     South Sandwich Islands Region    2024.12.17-07:17:57.47    q:B      mb:5.1*    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: 5.1* [18]    Mwp: - [0]    Mwpd: - [0] Region: South Sandwich Islands Region Origin Time: 2024.12.17-07:17:57.47 UTC Hypocenter: lat: -60.31°  lon: -28.32°  [+/-16km]    depth: 23km  [+/-13km] Location Quality: qualityCode:  B     stdErr: 2.7s   assocPhases: 58   usedPhases: 23 minDist: 7.5°   maxDist: 117.4°   AzGap: 85°   2ndAzGap: 119°   atten: -1.68 [+/-0.74] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 8km   maxHorUnc: 16km   azMaxHorUnc: 20° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 20°   majorAxisPlunge: 1°   semiIntermediateAxisLength: 13km   intermediateAxisAzimuth: 123°   intermediateAxisPlunge: 86°   semiMinorAxisLength: 10km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [18]    Td: 1.9Xs [1]    Td*T50Ex: - [0]    To: 10.0s [16] Closest plate boundaries:    Sandwich - Scotia [continental transform fault]: distance: ~30km    Scotia - Antarctica [oceanic transform fault]: distance: ~40km    Sandwich - Antarctica [oceanic transform fault]: distance: ~50km    Antarctica - South America [oceanic transform fault]: distance: ~120km    Sandwich / South America [subduction zone]: distance: ~120km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (120km)  no  YES (30km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        23km        23km        23km 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: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 52°   dip: 10°   rake: 32° Nodal Plane 2: strike: 291°   dip: 85°   rake: 99° Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 4.7   misfit: 0.04   stationDistributionRatio: 0.49   meanDistP: 37.7   meanDistT: 45.9   qualityCode: C 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: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 129°   dip: 8°   rake: 96° Nodal Plane 2: strike: 303°   dip: 82°   rake: 89° Quality: azimuthalGap: 84°   stationPolarityCount: 22   misfit: 0.24   stationDistributionRatio: 0.62   rmsAngDiffAccPref: 28.56   fracAcc30degPref: 0.58   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1734419874722
Event info last updated: 2024.12.17-08:16:01 UTC
Event first association/location: 2024.12.17-07:26:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA