Early-est:     La Rioja Province, Argentina    2026.02.06-03:44:54.13    q:A      mb:5.3*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770349493985.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770349493985.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770349493985.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 5.3* [41]    Mwp: 4.7X [1]    Mwpd: 5.0Xinv [1]
Region: La Rioja Province, Argentina
Origin Time: 2026.02.06-03:44:54.13 UTC
Hypocenter: lat: -28.97°  lon: -68.97°  [+/-6km]    depth: 121km  [+/-8km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 108   usedPhases: 79
minDist: 1.5°   maxDist: 165.0°   AzGap: 47°   2ndAzGap: 76°   atten: -1.24 [+/-0.16]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 6km   azMaxHorUnc: 14°
68%ConfEllipsoid:   semiMajorAxisLength: 8km   majorAxisAzimuth: 220°   majorAxisPlunge: 57°   semiIntermediateAxisLength: 7km   intermediateAxisAzimuth: 348°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.0 [33]    Td: 0.5Xs [3]    Td*T50Ex: - [0]    To: 1.1s [33]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~320km
Subduction geometry:    Zone: South America: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (320km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       121km
       121km
       121km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1770349493985.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 336°   dip: 51°   rake: -27°
Nodal Plane 2: strike: 84°   dip: 69°   rake: -138°
Quality: azimuthalGap: -1°   stationPolarityCount: 48   misfitWeightCount: 16.1   misfit: 0.05   stationDistributionRatio: 0.53   meanDistP: 23.7   meanDistT: 32.4   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770349493985.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1770349493985.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 83°   dip: 67°   rake: -131°
Nodal Plane 2: strike: 329°   dip: 46°   rake: -33°
Quality: azimuthalGap: 82°   stationPolarityCount: 48   misfit: 0.13   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 21.27   fracAcc30degPref: 0.88   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770349493985.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770349493985
Event info last updated: 2026.02.06-04:43:01 UTC
Event first association/location: 2026.02.06-03:50:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA