Early-est:     Chile - Bolivia Border Region    2026.02.08-16:23:52.98    q:B      mb:5.3*    Mwp:5.5    Mwpd:-    Td*T50Ex:1.1     fmamp_polarity:./hypo.1770567834312.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770567834312.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770567834312.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 5.3* [62]    Mwp: 5.5 [12]    Mwpd: 5.7Xinv [12]
Region: Chile - Bolivia Border Region
Origin Time: 2026.02.08-16:23:52.98 UTC
Hypocenter: lat: -20.01°  lon: -68.98°  [+/-15km]    depth: 71km  [+/-27km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 145   usedPhases: 87
minDist: 3.8°   maxDist: 170.0°   AzGap: 46°   2ndAzGap: 54°   atten: -1.50 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 129°
68%ConfEllipsoid:   semiMajorAxisLength: 29km   majorAxisAzimuth: 148°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 289°   intermediateAxisPlunge: 18°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.7 [55]    Td: 1.5s [16]    Td*T50Ex: 1.1 [16]    To: 5.1s [53]
Closest plate boundaries:
   Altiplano - South America [continental rift boundary]: distance: ~170km
   Nazca \ Altiplano [subduction zone]: distance: ~250km
   Nazca \ South America [subduction zone]: distance: ~320km
Subduction geometry:    Zone: South America: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (250km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   1.1
   1.1
   1.1
Td*To:
     7.6
     7.6
     7.6
Mwp magnitude:
       5.5
       5.5
       5.5
Hypocenter depth:
       71km
       71km
       71km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1770567834312.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 259°   dip: 60°   rake: -24°
Nodal Plane 2: strike: 2°   dip: 69°   rake: -147°
Quality: azimuthalGap: -1°   stationPolarityCount: 61   misfitWeightCount: 17.1   misfit: 0.16   stationDistributionRatio: 0.47   meanDistP: 36.7   meanDistT: 47.2   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770567834312.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1770567834312.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 151°   dip: 75°   rake: -174°
Nodal Plane 2: strike: 59°   dip: 84°   rake: -15°
Quality: azimuthalGap: 54°   stationPolarityCount: 61   misfit: 0.46   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 34.94   fracAcc30degPref: 0.59   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770567834312.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770567834312
Event info last updated: 2026.02.08-17:22:00 UTC
Event first association/location: 2026.02.08-16:28:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA