Early-est:     Central Chile    2026.10.04-13:57:39.46    q:B      mb:-    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791122259461.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791122259461.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791122259461.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791122259461.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: 4.5X [3]    Mwp: - [0]    Mwpd: - [0]
Region: Central Chile
Origin Time: 2026.10.04-13:57:39.46 UTC
Hypocenter: lat: -38.94°  lon: -72.60°  [+/-7km]    depth: 69km  [+/-9km]
Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 11   usedPhases: 11
minDist: 1.1°   maxDist: 37.1°   AzGap: 120°   2ndAzGap: 153°   atten: -1.78 [+/-0.55]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 7km   azMaxHorUnc: 34°
68%ConfEllipsoid:   semiMajorAxisLength: 9km   majorAxisAzimuth: 189°   majorAxisPlunge: 72°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 38°   intermediateAxisPlunge: 16°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.6X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~200km
Subduction geometry:    Zone: South America    Slab depth at epicenter: 53km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (200km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       69km
       69km
       69km
Slab depth at epicenter:
       53km
       -
       -
./hypo.1791122259461.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 148°   dip: 13°   rake: 79°
Nodal Plane 2: strike: 340°   dip: 77°   rake: 93°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 6.1   misfit: 0.08   stationDistributionRatio: 0.34   meanDistP: 34.0   meanDistT: 47.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791122259461.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 184°   dip: 70°   rake: -164°
Nodal Plane 2: strike: 89°   dip: 75°   rake: -20°
Quality: azimuthalGap: 109°   stationPolarityCount: 10   misfit: 0.20   stationDistributionRatio: 0.40   rmsAngDiffAccPref: 37.74   fracAcc30degPref: 0.52   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791122259461.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.1791122259461.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.1791122259461.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791122259461
Event info last updated: 2026.10.04-14:57:47 UTC
Event first association/location: 2026.10.04-14:10:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI