Early-est:     Scotia Sea    2025.12.15-14:52:14.47    q:C      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 [6]    Mwp: 1.6X [1]    Mwpd: 6.1Xinv [1] Region: Scotia Sea Origin Time: 2025.12.15-14:52:14.47 UTC Hypocenter: lat: -60.63°  lon: -51.78°  [+/-12km]    depth: 57km  [+/-17km] Location Quality: qualityCode:  C     stdErr: 1.8s   assocPhases: 12   usedPhases: 10 minDist: 3.5°   maxDist: 151.1°   AzGap: 120°   2ndAzGap: 159°   atten: -1.66 [+/-1.60] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 12km   azMaxHorUnc: 83° 68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 265°   majorAxisPlunge: 78°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 83°   intermediateAxisPlunge: 12°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [5]    Td: 7.7Xs [1]    Td*T50Ex: - [0]    To: 10.8s [5] Closest plate boundaries:    Scotia - Antarctica [oceanic spreading ridge]: distance: ~20km    Scotia - Shetland [continental convergent boundary]: distance: ~140km    Shetland - Antarctica [continental rift boundary]: distance: ~170km    Shetland / Antarctica [subduction zone]: distance: ~280km    Scotia / Antarctica [subduction zone]: distance: ~780km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  no  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        57km        57km        57km Slab depth at epicenter:        n/a        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 330°   dip: 9°   rake: 171° Nodal Plane 2: strike: 69°   dip: 89°   rake: 81° Quality: azimuthalGap: -1°   stationPolarityCount: 8   misfitWeightCount: 3.9   misfit: 0.05   stationDistributionRatio: 0.43   meanDistP: 47.3   meanDistT: 40.7   qualityCode: D 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: 55°   dip: 21°   rake: -81° Nodal Plane 2: strike: 225°   dip: 69°   rake: -93° Quality: azimuthalGap: 121°   stationPolarityCount: 8   misfit: 0.26   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 48.32   fracAcc30degPref: 0.26   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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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: nan° Nodal Plane 2: strike: nan°   dip: nan°   rake: nan° 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/1765810334473
Event info last updated: 2025.12.15-15:53:03 UTC
Event first association/location: 2025.12.15-15:25:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI