Early-est:     San Juan Province, Argentina    2025.01.28-16:51:17.38    q:B      mb:4.8    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1738083080308.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1738083080308.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1738083080308.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1738083080308.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 [22]    Mwp: - [0]    Mwpd: - [0]
Region: San Juan Province, Argentina
Origin Time: 2025.01.28-16:51:17.38 UTC
Hypocenter: lat: -31.72°  lon: -69.09°  [+/-9km]    depth: 117km  [+/-7km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 61   usedPhases: 40
minDist: 0.4°   maxDist: 151.1°   AzGap: 84°   2ndAzGap: 96°   atten: -1.30 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 9km   azMaxHorUnc: 23°
68%ConfEllipsoid:   semiMajorAxisLength: 11km   majorAxisAzimuth: 203°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 8km   intermediateAxisAzimuth: 109°   intermediateAxisPlunge: 56°   semiMinorAxisLength: 7km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.5 [11]    Td: 0.9Xs [1]    Td*T50Ex: - [0]    To: 1.4s [5]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~340km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 112km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (340km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       117km
       117km
       117km
Slab depth at epicenter:
       112km
       -
       -
./hypo.1738083080308.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 196°   dip: 43°   rake: -164°
Nodal Plane 2: strike: 94°   dip: 79°   rake: -48°
Quality: azimuthalGap: -1°   stationPolarityCount: 34   misfitWeightCount: 15.2   misfit: 0.16   stationDistributionRatio: 0.59   meanDistP: 35.6   meanDistT: 29.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1738083080308.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 215°   dip: 88°   rake: 158°
Nodal Plane 2: strike: 306°   dip: 68°   rake: 2°
Quality: azimuthalGap: 76°   stationPolarityCount: 34   misfit: 0.21   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 10.24   fracAcc30degPref: 0.98   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1738083080308.mech.hash.mechanism.jpg
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
./hypo.1738083080308.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1738083080308.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1738083080308
Event info last updated: 2025.01.28-17:52:01 UTC
Event first association/location: 2025.01.28-16:53:01 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI