Early-est:     Philippine Islands Region    2026.02.12-14:02:14.53    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770904937044.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770904937044.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770904937044.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: 4.9* [26]    Mwp: - [0]    Mwpd: - [0]
Region: Philippine Islands Region
Origin Time: 2026.02.12-14:02:14.53 UTC
Hypocenter: lat: 19.82°  lon: 121.45°  [+/-22km]    depth: 15km  [+/-22km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 49   usedPhases: 29
minDist: 9.4°   maxDist: 141.3°   AzGap: 107°   2ndAzGap: 121°   atten: -0.51 [+/-0.39]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 22km   azMaxHorUnc: 161°
68%ConfEllipsoid:   semiMajorAxisLength: 28km   majorAxisAzimuth: 175°   majorAxisPlunge: 25°   semiIntermediateAxisLength: 25km   intermediateAxisAzimuth: 285°   intermediateAxisPlunge: 36°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [14]    Td: -s [0]    Td*T50Ex: - [0]    To: 5.5s [11]
Closest plate boundaries:
   Philippine Sea / Sunda [subduction zone]: distance: ~110km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (110km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1770904937044.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 44°   dip: 38°   rake: 99°
Nodal Plane 2: strike: 213°   dip: 53°   rake: 83°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 7.2   misfit: 0.09   stationDistributionRatio: 0.55   meanDistP: 48.9   meanDistT: 37.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770904937044.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.1770904937044.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 211°   dip: 42°   rake: 99°
Nodal Plane 2: strike: 18°   dip: 49°   rake: 82°
Quality: azimuthalGap: 109°   stationPolarityCount: 22   misfit: 0.26   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 41.80   fracAcc30degPref: 0.39   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770904937044.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770904937044
Event info last updated: 2026.02.12-15:01:00 UTC
Event first association/location: 2026.02.12-14:37:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA