Early-est:     Chile - Bolivia Border Region    2026.10.09-06:41:44.74    q:B      mb:4.3    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: 4.3 [7]    Mwp: - [0]    Mwpd: - [0] Region: Chile - Bolivia Border Region Origin Time: 2026.10.09-06:41:44.74 UTC Hypocenter: lat: -21.30°  lon: -68.55°  [+/-13km]    depth: 93km  [+/-16km] Location Quality: qualityCode:  B     stdErr: 0.8s   assocPhases: 13   usedPhases: 9 minDist: 1.7°   maxDist: 163.4°   AzGap: 171°   2ndAzGap: 199°   atten: -1.19 [+/-0.41] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 13km   azMaxHorUnc: 95° 68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 93°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 275°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 11km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.8X [2]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0] Closest plate boundaries:    Altiplano - South America [continental rift boundary]: distance: ~50km    Nazca \ Altiplano [subduction zone]: distance: ~280km    Nazca \ South America [subduction zone]: distance: ~290km Subduction geometry:    Zone: South America    Slab depth at epicenter: 109km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (280km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        93km        93km        93km Slab depth at epicenter:        109km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 45°   dip: 27°   rake: 9° Nodal Plane 2: strike: 307°   dip: 86°   rake: 117° Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 4.7   misfit: 0.07   stationDistributionRatio: 0.45   meanDistP: 33.2   meanDistT: 45.1   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 157°   stationPolarityCount: 12   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E 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: 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
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

Event ID: smi:KOERI/ee/event/1791528105445
Event info last updated: 2026.10.09-07:42:02 UTC
Event first association/location: 2026.10.09-06:47:30 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI