Early-est:     Philippine Islands Region    2026.10.13-06:01:29.80    q:C      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791871298111.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791871298111.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791871298111.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791871298111.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: 4.6 [13]    Mwp: 5.4X [2]    Mwpd: - [0]
Region: Philippine Islands Region
Origin Time: 2026.10.13-06:01:29.80 UTC
Hypocenter: lat: 19.74°  lon: 120.62°  [+/-20km]    depth: 10km  [+/-15km]
Location Quality: qualityCode:  C     stdErr: 2.0s   assocPhases: 18   usedPhases: 11
minDist: 3.1°   maxDist: 51.1°   AzGap: 115°   2ndAzGap: 146°   atten: -1.37 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 20km   azMaxHorUnc: 152°
68%ConfEllipsoid:   semiMajorAxisLength: 25km   majorAxisAzimuth: 331°   majorAxisPlunge: 7°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 209°   intermediateAxisPlunge: 77°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [5]    Td: 1.6Xs [1]    Td*T50Ex: - [0]    To: 35.6Xs [2]
Closest plate boundaries:
   Philippine Sea / Sunda [subduction zone]: distance: ~30km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (30km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791871298111.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 258°   dip: 40°   rake: 105°
Nodal Plane 2: strike: 59°   dip: 52°   rake: 78°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 6.4   misfit: 0.16   stationDistributionRatio: 0.34   meanDistP: 47.8   meanDistT: 41.8   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791871298111.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 189°   dip: 5°   rake: 23°
Nodal Plane 2: strike: 76°   dip: 88°   rake: 94°
Quality: azimuthalGap: 114°   stationPolarityCount: 12   misfit: 0.36   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 45.37   fracAcc30degPref: 0.30   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791871298111.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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_aref
./hypo.1791871298111.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1791871298111.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791871298111
Event info last updated: 2026.10.13-07:01:46 UTC
Event first association/location: 2026.10.13-06:07:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI