Early-est:     Near Coast of Guerrero, Mexico    2026.03.28-12:57:54.91    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:3.3     fmamp_polarity:./hypo.1774702676337.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774702676337.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774702676337.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: 4.6* [21]    Mwp: 5.6X [2]    Mwpd: 5.7Xinv [1]
Region: Near Coast of Guerrero, Mexico
Origin Time: 2026.03.28-12:57:54.91 UTC
Hypocenter: lat: 16.39°  lon: -98.50°  [+/-36km]    depth: 2km  [+/-44km]
Location Quality: qualityCode:  C     stdErr: 1.2s   assocPhases: 49   usedPhases: 21
minDist: 3.0°   maxDist: 62.7°   AzGap: 164°   2ndAzGap: 184°   atten: -1.22 [+/-0.55]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 29km   maxHorUnc: 36km   azMaxHorUnc: 6°
68%ConfEllipsoid:   semiMajorAxisLength: 46km   majorAxisAzimuth: 19°   majorAxisPlunge: 41°   semiIntermediateAxisLength: 43km   intermediateAxisAzimuth: 165°   intermediateAxisPlunge: 44°   semiMinorAxisLength: 35km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 48%
T50Ex: 0.6 [15]    Td: 5.5s [5]    Td*T50Ex: 3.3 [5]    To: 24.0s [13]
Closest plate boundaries:
   Cocos \ North America [subduction zone]: distance: ~70km
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 (70km)
 no
 no
Prob underwater:
 48%
 48%
 48%
Td*T50Ex:
   3.3
   3.3
   3.3
Td*To:
     132.0
     132.0
     132.0
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       2km
       2km
       2km
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.1774702676337.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 126°   dip: 45°   rake: 44°
Nodal Plane 2: strike: 2°   dip: 61°   rake: 126°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 4.1   misfit: 0.06   stationDistributionRatio: 0.44   meanDistP: 48.6   meanDistT: 49.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774702676337.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.1774702676337.mech.fmamp_polarity_waveform.mechanism.jpg
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: 163°   stationPolarityCount: 16   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774702676337.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774702676337
Event info last updated: 2026.03.28-13:56:00 UTC
Event first association/location: 2026.03.28-13:08:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA