Early-est:     Philippine Islands Region    2026.09.28-15:01:46.88    q:C      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790607699596.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790607699596.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790607699596.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* [29]    Mwp: - [0]    Mwpd: - [0]
Region: Philippine Islands Region
Origin Time: 2026.09.28-15:01:46.88 UTC
Hypocenter: lat: 5.62°  lon: 127.12°  [+/-14km]    depth: 146km  [+/-40km]
Location Quality: qualityCode:  C     stdErr: 1.5s   assocPhases: 61   usedPhases: 33
minDist: 2.1°   maxDist: 151.2°   AzGap: 103°   2ndAzGap: 109°   atten: 0.38 [+/-0.33]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 104°
68%ConfEllipsoid:   semiMajorAxisLength: 41km   majorAxisAzimuth: 62°   majorAxisPlunge: 79°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 307°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [16]    Td: 1.2Xs [2]    Td*T50Ex: - [0]    To: 2.5s [16]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~40km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (40km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       146km
       146km
       146km
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.1790607699596.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 77°   dip: 33°   rake: -53°
Nodal Plane 2: strike: 215°   dip: 64°   rake: -112°
Quality: azimuthalGap: -1°   stationPolarityCount: 29   misfitWeightCount: 11.0   misfit: 0.18   stationDistributionRatio: 0.46   meanDistP: 50.8   meanDistT: 44.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790607699596.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.1790607699596.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 186°   dip: 80°   rake: -136°
Nodal Plane 2: strike: 86°   dip: 46°   rake: -13°
Quality: azimuthalGap: 102°   stationPolarityCount: 29   misfit: 0.33   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 37.38   fracAcc30degPref: 0.58   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790607699596.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790607699596
Event info last updated: 2026.09.28-16:00:00 UTC
Event first association/location: 2026.09.28-15:08:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA