Early-est:     South Sandwich Islands Region    2025.12.13-14:04:34.24    q:B      mb:5.1    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

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

Earthquake Details: Magnitude: mb: 5.1 [24]    Mwp: - [0]    Mwpd: - [0] Region: South Sandwich Islands Region Origin Time: 2025.12.13-14:04:34.24 UTC Hypocenter: lat: -58.99°  lon: -25.35°  [+/-17km]    depth: 66km  [+/-22km] Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 84   usedPhases: 43 minDist: 9.9°   maxDist: 163.7°   AzGap: 56°   2ndAzGap: 82°   atten: -2.17 [+/-0.40] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 17km   azMaxHorUnc: 59° 68%ConfEllipsoid:   semiMajorAxisLength: 26km   majorAxisAzimuth: 237°   majorAxisPlunge: 48°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 135°   intermediateAxisPlunge: 10°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.2 [16]    Td: 0.6Xs [1]    Td*T50Ex: - [0]    To: 1.6s [11] Closest plate boundaries:    Sandwich / South America [subduction zone]: distance: ~70km    Antarctica - South America [oceanic transform fault]: distance: ~160km    Sandwich - Antarctica [oceanic transform fault]: distance: ~160km Subduction geometry:    Zone: Scotia    Slab depth at epicenter: 19km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (70km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        66km        66km        66km Slab depth at epicenter:        19km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 141°   dip: 53°   rake: -159° Nodal Plane 2: strike: 38°   dip: 73°   rake: -39° Quality: azimuthalGap: -1°   stationPolarityCount: 45   misfitWeightCount: 10.2   misfit: 0.10   stationDistributionRatio: 0.43   meanDistP: 33.0   meanDistT: 26.9   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 119°   dip: 79°   rake: -170° Nodal Plane 2: strike: 27°   dip: 80°   rake: -11° Quality: azimuthalGap: 56°   stationPolarityCount: 45   misfit: 0.47   stationDistributionRatio: 0.54   rmsAngDiffAccPref: 38.91   fracAcc30degPref: 0.76   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (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/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp

Event ID: smi:KOERI/ee/event/1765634677126
Event info last updated: 2025.12.13-15:04:45 UTC
Event first association/location: 2025.12.13-14:14:28 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI