Early-est:     Northern Chile    2025.01.28-12:26:19.55    q:B      mb:4.2    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: 4.2 [8]    Mwp: - [0]    Mwpd: - [0] Region: Northern Chile Origin Time: 2025.01.28-12:26:19.55 UTC Hypocenter: lat: -22.75°  lon: -69.24°  [+/-9km]    depth: 107km  [+/-15km] Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 11   usedPhases: 10 minDist: 1.0°   maxDist: 20.5°   AzGap: 169°   2ndAzGap: 178°   atten: -1.79 [+/-0.35] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 6km   maxHorUnc: 9km   azMaxHorUnc: 108° 68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 277°   majorAxisPlunge: 74°   semiIntermediateAxisLength: 11km   intermediateAxisAzimuth: 111°   intermediateAxisPlunge: 16°   semiMinorAxisLength: 8km Tsunamigeneic Assesment: Discriminants: Prob Underwater: <1% T50Ex: 0.7 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: -s [0] Closest plate boundaries:    Altiplano - South America [continental rift boundary]: distance: ~140km    Nazca \ South America [subduction zone]: distance: ~220km    Nazca \ Altiplano [subduction zone]: distance: ~230km Subduction geometry:    Zone: South America    Slab depth at epicenter: 83km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (220km)  no  no Prob underwater:  <1%  <1%  <1% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        107km        107km        107km Slab depth at epicenter:        83km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 137°   dip: 35°   rake: 154° Nodal Plane 2: strike: 249°   dip: 76°   rake: 58° Quality: azimuthalGap: -1°   stationPolarityCount: 8   misfitWeightCount: 5.1   misfit: 0.06   stationDistributionRatio: 0.31   meanDistP: 32.9   meanDistT: 36.3   qualityCode: C 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: 178°   stationPolarityCount: 8   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/1738067179741
Event info last updated: 2025.01.28-13:26:29 UTC
Event first association/location: 2025.01.28-12:29:25 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI