Early-est:     Jujuy Province, Argentina    2025.12.09-17:54:44.74    q:A      mb:4.4    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: 4.4 [19]    Mwp: 4.5X [1]    Mwpd: - [0] Region: Jujuy Province, Argentina Origin Time: 2025.12.09-17:54:44.74 UTC Hypocenter: lat: -22.76°  lon: -66.45°  [+/-6km]    depth: 278km  [+/-8km] Location Quality: qualityCode:  A     stdErr: 0.7s   assocPhases: 52   usedPhases: 20 minDist: 1.6°   maxDist: 148.9°   AzGap: 87°   2ndAzGap: 95°   atten: -1.39 [+/-0.36] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 5km   maxHorUnc: 6km   azMaxHorUnc: 0° 68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 184°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 359°   intermediateAxisPlunge: 28°   semiMinorAxisLength: 6km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.2 [19]    Td: 0.7Xs [2]    Td*T50Ex: - [0]    To: 1.9s [6] Closest plate boundaries:    Altiplano - South America [continental rift boundary]: distance: ~140km    Nazca \ South America [subduction zone]: distance: ~500km    Nazca \ Altiplano [subduction zone]: distance: ~510km Subduction geometry:    Zone: South America    Slab depth at epicenter: 203km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (500km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        278km        278km        278km Slab depth at epicenter:        203km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 142°   dip: 17°   rake: -124° Nodal Plane 2: strike: 357°   dip: 76°   rake: -80° Quality: azimuthalGap: -1°   stationPolarityCount: 29   misfitWeightCount: 13.0   misfit: 0.13   stationDistributionRatio: 0.52   meanDistP: 20.9   meanDistT: 38.4   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: 39°   dip: 55°   rake: -120° Nodal Plane 2: strike: 265°   dip: 44°   rake: -54° Quality: azimuthalGap: 80°   stationPolarityCount: 29   misfit: 0.32   stationDistributionRatio: 0.51   rmsAngDiffAccPref: 38.75   fracAcc30degPref: 0.48   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/1765302885230
Event info last updated: 2025.12.09-18:54:51 UTC
Event first association/location: 2025.12.09-17:59:04 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI