Early-est:     Near Coast of Chiapas, Mexico    2026.08.18-05:02:39.28    q:B      mb:5.0    Mwp:6.0*    Mwpd:-    Td*T50Ex:3.8     fmamp_polarity:./hypo.1787029358204.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1787029358204.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1787029358204.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: 5.0 [59]    Mwp: 6.0* [49]    Mwpd: 6.2Xinv [42]
Region: Near Coast of Chiapas, Mexico
Origin Time: 2026.08.18-05:02:39.28 UTC
Hypocenter: lat: 14.41°  lon: -92.87°  [+/-23km]    depth: 68km  [+/-46km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 150   usedPhases: 50
minDist: 5.4°   maxDist: 144.8°   AzGap: 95°   2ndAzGap: 112°   atten: -1.32 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 23km   azMaxHorUnc: 66°
68%ConfEllipsoid:   semiMajorAxisLength: 50km   majorAxisAzimuth: 72°   majorAxisPlunge: 64°   semiIntermediateAxisLength: 21km   intermediateAxisAzimuth: 230°   intermediateAxisPlunge: 25°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [42]    Td: 6.2s [35]    Td*T50Ex: 3.8 [35]    To: 35.6s [42]
Closest plate boundaries:
   Cocos \ North America [subduction zone]: distance: ~80km
Subduction geometry:    Zone: Central 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 (80km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   3.8
   3.8
   3.8
Td*To:
     220.7
     220.7
     220.7
Mwp magnitude:
       6.0*
       6.0*
       6.0*
Hypocenter depth:
       68km
       68km
       68km
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.1787029358204.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 150°   dip: 6°   rake: -65°
Nodal Plane 2: strike: 305°   dip: 85°   rake: -93°
Quality: azimuthalGap: -1°   stationPolarityCount: 50   misfitWeightCount: 14.2   misfit: 0.02   stationDistributionRatio: 0.62   meanDistP: 16.4   meanDistT: 17.6   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1787029358204.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 100°   dip: 5°   rake: -114°
Nodal Plane 2: strike: 304°   dip: 86°   rake: -88°
Quality: azimuthalGap: -1°   stationPolarityCount: 11   misfitWeightCount: 4.9   misfit: 0.00   stationDistributionRatio: 0.53   meanDistP: 45.9   meanDistT: 38.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1787029358204.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 201°   dip: 15°   rake: -5°
Nodal Plane 2: strike: 296°   dip: 89°   rake: -105°
Quality: azimuthalGap: 109°   stationPolarityCount: 50   misfit: 0.12   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 21.17   fracAcc30degPref: 0.91   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1787029358204.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1787029358204
Event info last updated: 2026.08.18-06:01:01 UTC
Event first association/location: 2026.08.18-05:07:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA