Early-est:     South Sandwich Islands Region    2025.01.26-11:24:03.77    q:B      mb:4.9    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: 4.9 [21]    Mwp: - [0]    Mwpd: - [0] Region: South Sandwich Islands Region Origin Time: 2025.01.26-11:24:03.77 UTC Hypocenter: lat: -59.90°  lon: -26.32°  [+/-12km]    depth: 118km  [+/-15km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 71   usedPhases: 32 minDist: 7.9°   maxDist: 151.5°   AzGap: 72°   2ndAzGap: 84°   atten: -2.07 [+/-0.45] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 12km   azMaxHorUnc: 8° 68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 9°   majorAxisPlunge: 42°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 185°   intermediateAxisPlunge: 48°   semiMinorAxisLength: 11km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [18]    Td: 1.8Xs [1]    Td*T50Ex: - [0]    To: 1.4s [14] Closest plate boundaries:    Antarctica - South America [oceanic transform fault]: distance: ~60km    Sandwich - Antarctica [oceanic transform fault]: distance: ~60km    Sandwich / South America [subduction zone]: distance: ~60km    Sandwich - Scotia [continental transform fault]: distance: ~100km Subduction geometry:    Zone: Scotia    Slab depth at epicenter: 15km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (60km)  no  YES (60km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        118km        118km        118km Slab depth at epicenter:        15km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 109°   dip: 43°   rake: -38° Nodal Plane 2: strike: 229°   dip: 65°   rake: -127° Quality: azimuthalGap: -1°   stationPolarityCount: 34   misfitWeightCount: 7.2   misfit: 0.09   stationDistributionRatio: 0.39   meanDistP: 36.2   meanDistT: 34.8   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 240°   dip: 64°   rake: -158° Nodal Plane 2: strike: 140°   dip: 70°   rake: -27° Quality: azimuthalGap: 72°   stationPolarityCount: 34   misfit: 0.33   stationDistributionRatio: 0.48   rmsAngDiffAccPref: 29.83   fracAcc30degPref: 0.74   qualityCode: C 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/1737890644177
Event info last updated: 2025.01.26-12:24:44 UTC
Event first association/location: 2025.01.26-11:33:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI