Early-est:     Mindanao, Philippines    2026.10.08-08:07:58.94    q:A      mb:5.3    Mwp:5.7    Mwpd:-    Td*T50Ex:1.2     fmamp_polarity:./hypo.1791446881334.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791446881334.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791446881334.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791446881334.mech.fmamp_amp_mwp.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 [88]    Mwp: 5.7 [13]    Mwpd: 6.0Xinv [7]
Region: Mindanao, Philippines
Origin Time: 2026.10.08-08:07:58.94 UTC
Hypocenter: lat: 5.68°  lon: 125.38°  [+/-14km]    depth: 31km  [+/-18km]
Location Quality: qualityCode:  A     stdErr: 1.8s   assocPhases: 166   usedPhases: 117
minDist: 1.4°   maxDist: 163.0°   AzGap: 42°   2ndAzGap: 67°   atten: -1.16 [+/-0.16]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 38°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 43°   majorAxisPlunge: 51°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 203°   intermediateAxisPlunge: 37°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 36%
T50Ex: 0.6 [73]    Td: 2.1s [18]    Td*T50Ex: 1.2 [18]    To: 26.1s [63]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~220km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (220km)
 no
 no
Prob underwater:
 36%
 36%
 36%
Td*T50Ex:
   1.2
   1.2
   1.2
Td*To:
     54.8
     54.8
     54.8
Mwp magnitude:
       5.7
       5.7
       5.7
Hypocenter depth:
       31km
       31km
       31km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791446881334.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 160°   dip: 26°   rake: 46°
Nodal Plane 2: strike: 27°   dip: 72°   rake: 108°
Quality: azimuthalGap: -1°   stationPolarityCount: 92   misfitWeightCount: 16.6   misfit: 0.19   stationDistributionRatio: 0.50   meanDistP: 18.8   meanDistT: 24.0   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791446881334.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 170°   dip: 25°   rake: 28°
Nodal Plane 2: strike: 54°   dip: 78°   rake: 113°
Quality: azimuthalGap: 46°   stationPolarityCount: 92   misfit: 0.35   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 36.25   fracAcc30degPref: 0.50   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791446881334.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 155°   dip: 33°   rake: 62°
Nodal Plane 2: strike: 7°   dip: 62°   rake: 107°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 6.3   misfit: 9999.90   stationDistributionRatio: 0.58   meanDistP: 33.4   meanDistT: 27.2   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1791446881334.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp
./hypo.1791446881334.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791446881334
Event info last updated: 2026.10.08-09:08:05 UTC
Event first association/location: 2026.10.08-08:12:47 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI