Early-est:     Near Coast of Guerrero, Mexico    2026.03.28-04:27:04.79    q:B      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774672017001.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774672017001.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774672017001.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: 4.5* [18]    Mwp: - [0]    Mwpd: - [0]
Region: Near Coast of Guerrero, Mexico
Origin Time: 2026.03.28-04:27:04.79 UTC
Hypocenter: lat: 16.47°  lon: -98.39°  [+/-18km]    depth: 5km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 34   usedPhases: 21
minDist: 3.0°   maxDist: 65.5°   AzGap: 169°   2ndAzGap: 176°   atten: -1.38 [+/-0.37]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 18km   azMaxHorUnc: 152°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 154°   majorAxisPlunge: 31°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 258°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.9s [13]
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:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       5km
       5km
       5km
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.1774672017001.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 11°   dip: 51°   rake: -32°
Nodal Plane 2: strike: 123°   dip: 65°   rake: -136°
Quality: azimuthalGap: -1°   stationPolarityCount: 20   misfitWeightCount: 4.6   misfit: 0.07   stationDistributionRatio: 0.37   meanDistP: 50.9   meanDistT: 53.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774672017001.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.1774672017001.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: 169°   stationPolarityCount: 19   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774672017001.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774672017001
Event info last updated: 2026.03.28-05:26:01 UTC
Event first association/location: 2026.03.28-04:34:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA