Early-est:     Mindanao, Philippines    2026.08.13-18:39:31.68    q:A      mb:5.3*    Mwp:5.2    Mwpd:-    Td*T50Ex:0.6     fmamp_polarity:./hypo.1786646370075.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786646370075.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786646370075.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: 5.3* [50]    Mwp: 5.2 [4]    Mwpd: 5.5Xinv [2]
Region: Mindanao, Philippines
Origin Time: 2026.08.13-18:39:31.68 UTC
Hypocenter: lat: 5.22°  lon: 125.66°  [+/-15km]    depth: 55km  [+/-31km]
Location Quality: qualityCode:  A     stdErr: 1.3s   assocPhases: 104   usedPhases: 69
minDist: 1.8°   maxDist: 162.5°   AzGap: 52°   2ndAzGap: 63°   atten: -1.63 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 68°
68%ConfEllipsoid:   semiMajorAxisLength: 32km   majorAxisAzimuth: 278°   majorAxisPlunge: 77°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 55°   intermediateAxisPlunge: 9°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [46]    Td: 1.2s [7]    Td*T50Ex: 0.6 [7]    To: 6.1s [45]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~210km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (210km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.6
   0.6
   0.6
Td*To:
     7.3
     7.3
     7.3
Mwp magnitude:
       5.2
       5.2
       5.2
Hypocenter depth:
       55km
       55km
       55km
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.1786646370075.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 223°   dip: 32°   rake: -74°
Nodal Plane 2: strike: 24°   dip: 60°   rake: -100°
Quality: azimuthalGap: -1°   stationPolarityCount: 58   misfitWeightCount: 19.4   misfit: 0.21   stationDistributionRatio: 0.48   meanDistP: 38.9   meanDistT: 38.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786646370075.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.1786646370075.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 190°   dip: 82°   rake: 143°
Nodal Plane 2: strike: 286°   dip: 54°   rake: 10°
Quality: azimuthalGap: 82°   stationPolarityCount: 58   misfit: 0.31   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 25.99   fracAcc30degPref: 0.78   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786646370075.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786646370075
Event info last updated: 2026.08.13-19:38:00 UTC
Event first association/location: 2026.08.13-18:43:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA