Early-est:     South Sandwich Islands Region    2025.12.15-00:43:18.16    q:A      mb:5.2    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: 5.2 [38]    Mwp: - [0]    Mwpd: - [0] Region: South Sandwich Islands Region Origin Time: 2025.12.15-00:43:18.16 UTC Hypocenter: lat: -58.76°  lon: -25.59°  [+/-14km]    depth: 82km  [+/-17km] Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 91   usedPhases: 66 minDist: 9.8°   maxDist: 153.1°   AzGap: 49°   2ndAzGap: 60°   atten: -1.91 [+/-0.32] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 13° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 202°   majorAxisPlunge: 39°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 347°   intermediateAxisPlunge: 45°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [34]    Td: 0.9Xs [1]    Td*T50Ex: - [0]    To: 29.8s [26] Closest plate boundaries:    Sandwich / South America [subduction zone]: distance: ~90km    Antarctica - South America [oceanic transform fault]: distance: ~180km    Sandwich - Antarctica [oceanic transform fault]: distance: ~180km Subduction geometry:    Zone: Scotia    Slab depth at epicenter: 33km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (90km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        82km        82km        82km Slab depth at epicenter:        33km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 161°   dip: 56°   rake: -10° Nodal Plane 2: strike: 257°   dip: 82°   rake: -146° Quality: azimuthalGap: -1°   stationPolarityCount: 54   misfitWeightCount: 11.0   misfit: 0.20   stationDistributionRatio: 0.37   meanDistP: 45.7   meanDistT: 35.5   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: 266°   dip: 75°   rake: -137° Nodal Plane 2: strike: 162°   dip: 49°   rake: -21° Quality: azimuthalGap: 63°   stationPolarityCount: 54   misfit: 0.36   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 34.22   fracAcc30degPref: 0.70   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: 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/1765759399633
Event info last updated: 2025.12.15-01:43:28 UTC
Event first association/location: 2025.12.15-00:51:12 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI