Early-est:     San Juan Province, Argentina    2025.02.01-16:28:56.03    q:B      mb:4.8    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738427336203.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738427336203.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738427336203.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738427336203.mech.fmamp_amp_mwp.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.8 [19]    Mwp: - [0]    Mwpd: - [0]
Region: San Juan Province, Argentina
Origin Time: 2025.02.01-16:28:56.03 UTC
Hypocenter: lat: -31.48°  lon: -68.69°  [+/-7km]    depth: 114km  [+/-8km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 54   usedPhases: 36
minDist: 0.1°   maxDist: 148.9°   AzGap: 73°   2ndAzGap: 89°   atten: -1.35 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 127°
68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 309°   majorAxisPlunge: 49°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 91°   intermediateAxisPlunge: 34°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.0 [9]    Td: -s [0]    Td*T50Ex: - [0]    To: 0.9s [5]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~380km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 115km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (380km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       114km
       114km
       114km
Slab depth at epicenter:
       115km
       -
       -
./hypo.1738427336203.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 141°   dip: 38°   rake: 131°
Nodal Plane 2: strike: 273°   dip: 62°   rake: 63°
Quality: azimuthalGap: -1°   stationPolarityCount: 31   misfitWeightCount: 11.8   misfit: 0.05   stationDistributionRatio: 0.47   meanDistP: 26.4   meanDistT: 23.0   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738427336203.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 147°   dip: 40°   rake: 144°
Nodal Plane 2: strike: 266°   dip: 68°   rake: 56°
Quality: azimuthalGap: 114°   stationPolarityCount: 31   misfit: 0.24   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 20.69   fracAcc30degPref: 0.91   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738427336203.mech.hash.mechanism.jpg
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
./hypo.1738427336203.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1738427336203.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738427336203
Event info last updated: 2025.02.01-17:29:04 UTC
Event first association/location: 2025.02.01-16:38:03 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI