Early-est:     Philippine Islands Region    2026.02.11-22:27:59.80    q:A      mb:5.2*    Mwp:5.6    Mwpd:-    Td*T50Ex:0.9     fmamp_polarity:./hypo.1770848881130.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770848881130.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770848881130.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: 5.2* [62]    Mwp: 5.6 [5]    Mwpd: 5.7Xinv [6]
Region: Philippine Islands Region
Origin Time: 2026.02.11-22:27:59.80 UTC
Hypocenter: lat: 20.30°  lon: 120.27°  [+/-13km]    depth: 9km  [+/-14km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 95   usedPhases: 66
minDist: 4.9°   maxDist: 171.1°   AzGap: 55°   2ndAzGap: 73°   atten: -0.88 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 151°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 335°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 67°   intermediateAxisPlunge: 29°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [54]    Td: 2.1s [11]    Td*T50Ex: 0.9 [11]    To: 18.7s [48]
Closest plate boundaries:
   Philippine Sea / Sunda [subduction zone]: distance: ~20km
   Yangtze - Sunda [continental convergent boundary]: distance: ~150km
   Philippine Sea - Yangtze [continental convergent boundary]: distance: ~150km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (20km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.9
   0.9
   0.9
Td*To:
     39.3
     39.3
     39.3
Mwp magnitude:
       5.6
       5.6
       5.6
Hypocenter depth:
       9km
       9km
       9km
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.1770848881130.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 214°   dip: 74°   rake: 10°
Nodal Plane 2: strike: 121°   dip: 80°   rake: 164°
Quality: azimuthalGap: -1°   stationPolarityCount: 56   misfitWeightCount: 9.6   misfit: 0.08   stationDistributionRatio: 0.33   meanDistP: 47.8   meanDistT: 48.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770848881130.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.1770848881130.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 123°   dip: 85°   rake: 165°
Nodal Plane 2: strike: 214°   dip: 75°   rake: 5°
Quality: azimuthalGap: 73°   stationPolarityCount: 56   misfit: 0.34   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 9.08   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770848881130.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770848881130
Event info last updated: 2026.02.11-23:26:01 UTC
Event first association/location: 2026.02.11-22:33:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA