Early-est:     Philippine Islands Region    2025.12.12-20:13:56.75    q:B      mb:4.9    Mwp:-    Mwpd:-    Td*T50Ex:0.9     fmamp_polarity:./hypo.1765570436942.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765570436942.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765570436942.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765570436942.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: 4.9 [23]    Mwp: - [0]    Mwpd: - [0]
Region: Philippine Islands Region
Origin Time: 2025.12.12-20:13:56.75 UTC
Hypocenter: lat: 8.26°  lon: 127.44°  [+/-14km]    depth: 12km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 0.9s   assocPhases: 59   usedPhases: 23
minDist: 2.2°   maxDist: 83.4°   AzGap: 131°   2ndAzGap: 178°   atten: -1.12 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 149°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 148°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 57°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [15]    Td: 2.0s [4]    Td*T50Ex: 0.9 [4]    To: 25.5s [13]
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:
   0.9
   0.9
   0.9
Td*To:
     51.0
     51.0
     51.0
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       12km
       12km
       12km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765570436942.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 107°   dip: 2°   rake: 130°
Nodal Plane 2: strike: 247°   dip: 88°   rake: 88°
Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 4.4   misfit: 0.10   stationDistributionRatio: 0.40   meanDistP: 35.4   meanDistT: 49.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765570436942.mech.fmamp_polarity.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: 178°   stationPolarityCount: 21   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765570436942.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.1765570436942.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.1765570436942.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765570436942
Event info last updated: 2025.12.12-21:14:03 UTC
Event first association/location: 2025.12.12-20:21:16 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI