Early-est:     Chiapas, Mexico    2026.09.30-04:07:04.48    q:B      mb:4.3*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790741224467.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790741224467.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790741224467.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: 4.3* [11]    Mwp: - [0]    Mwpd: - [0]
Region: Chiapas, Mexico
Origin Time: 2026.09.30-04:07:04.48 UTC
Hypocenter: lat: 17.85°  lon: -93.76°  [+/-12km]    depth: 180km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 32   usedPhases: 8
minDist: 5.3°   maxDist: 168.3°   AzGap: 127°   2ndAzGap: 145°   atten: -2.15 [+/-0.65]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 12km   azMaxHorUnc: 78°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 258°   majorAxisPlunge: 78°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 78°   intermediateAxisPlunge: 12°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.6X [2]    Td: -s [0]    Td*T50Ex: - [0]    To: 82.1Xs [2]
Closest plate boundaries:
   Cocos \ North America [subduction zone]: distance: ~360km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (360km)
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       180km
       180km
       180km
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.1790741224467.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 42°   dip: 18°   rake: 131°
Nodal Plane 2: strike: 179°   dip: 77°   rake: 78°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 5.5   misfit: 0.15   stationDistributionRatio: 0.52   meanDistP: 54.9   meanDistT: 52.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790741224467.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.1790741224467.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 360°   dip: 29°   rake: 114°
Nodal Plane 2: strike: 153°   dip: 64°   rake: 77°
Quality: azimuthalGap: 110°   stationPolarityCount: 9   misfit: 0.09   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 53.23   fracAcc30degPref: 0.22   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790741224467.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790741224467
Event info last updated: 2026.09.30-05:06:00 UTC
Event first association/location: 2026.09.30-04:12:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA