Early-est:     Near Coast of Central Chile    2026.05.31-21:34:18.55    q:A      mb:5.5    Mwp:6.0*    Mwpd:-    Td*T50Ex:1.2     fmamp_polarity:./hypo.1780263253251.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1780263253251.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1780263253251.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: 5.5 [58]    Mwp: 6.0* [19]    Mwpd: 6.1Xinv [21]
Region: Near Coast of Central Chile
Origin Time: 2026.05.31-21:34:18.55 UTC
Hypocenter: lat: -32.86°  lon: -71.81°  [+/-5km]    depth: 23km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.5s   assocPhases: 201   usedPhases: 108
minDist: 1.0°   maxDist: 177.2°   AzGap: 40°   2ndAzGap: 64°   atten: -1.24 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 5km   maxHorUnc: 5km   azMaxHorUnc: 147°
68%ConfEllipsoid:   semiMajorAxisLength: 13km   majorAxisAzimuth: 123°   majorAxisPlunge: 76°   semiIntermediateAxisLength: 6km   intermediateAxisAzimuth: 345°   intermediateAxisPlunge: 11°   semiMinorAxisLength: 5km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [52]    Td: 2.8s [9]    Td*T50Ex: 1.2 [9]    To: 9.4s [52]
Closest plate boundaries:
   Nazca \ South America [subduction zone]: distance: ~100km
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 (100km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.2
   1.2
   1.2
Td*To:
     26.3
     26.3
     26.3
Mwp magnitude:
       6.0*
       6.0*
       6.0*
Hypocenter depth:
       23km
       23km
       23km
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.1780263253251.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 33°   dip: 58°   rake: 155°
Nodal Plane 2: strike: 138°   dip: 69°   rake: 35°
Quality: azimuthalGap: -1°   stationPolarityCount: 65   misfitWeightCount: 12.5   misfit: 0.17   stationDistributionRatio: 0.46   meanDistP: 44.7   meanDistT: 45.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1780263253251.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 33°   dip: 28°   rake: 141°
Nodal Plane 2: strike: 158°   dip: 73°   rake: 67°
Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 3.6   misfit: 0.00   stationDistributionRatio: 0.49   meanDistP: 48.1   meanDistT: 40.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1780263253251.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 84°   dip: 36°   rake: -171°
Nodal Plane 2: strike: 346°   dip: 85°   rake: -54°
Quality: azimuthalGap: 65°   stationPolarityCount: 65   misfit: 0.34   stationDistributionRatio: 0.74   rmsAngDiffAccPref: 33.36   fracAcc30degPref: 0.58   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1780263253251.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1780263253251
Event info last updated: 2026.05.31-22:33:03 UTC
Event first association/location: 2026.05.31-21:36:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA