Early-est:     Mindanao, Philippines    2026.03.28-03:33:58.96    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:0.4     fmamp_polarity:./hypo.1774668839660.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774668839660.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774668839660.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* [24]    Mwp: 4.9X [2]    Mwpd: 5.4Xinv [2]
Region: Mindanao, Philippines
Origin Time: 2026.03.28-03:33:58.96 UTC
Hypocenter: lat: 5.65°  lon: 125.68°  [+/-15km]    depth: 205km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 56   usedPhases: 39
minDist: 1.4°   maxDist: 162.8°   AzGap: 106°   2ndAzGap: 116°   atten: -1.43 [+/-0.40]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 57°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 34°   majorAxisPlunge: 51°   semiIntermediateAxisLength: 19km   intermediateAxisAzimuth: 252°   intermediateAxisPlunge: 32°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [22]    Td: 0.9s [6]    Td*T50Ex: 0.4 [6]    To: 2.6s [20]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~190km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (190km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.4
   0.4
   0.4
Td*To:
     2.3
     2.3
     2.3
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       205km
       205km
       205km
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.1774668839660.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 241°   dip: 64°   rake: -170°
Nodal Plane 2: strike: 146°   dip: 81°   rake: -27°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 10.5   misfit: 0.06   stationDistributionRatio: 0.62   meanDistP: 42.5   meanDistT: 42.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774668839660.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.1774668839660.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 243°   dip: 51°   rake: -175°
Nodal Plane 2: strike: 150°   dip: 86°   rake: -39°
Quality: azimuthalGap: 105°   stationPolarityCount: 26   misfit: 0.13   stationDistributionRatio: 0.83   rmsAngDiffAccPref: 25.58   fracAcc30degPref: 0.79   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774668839660.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774668839660
Event info last updated: 2026.03.28-04:32:00 UTC
Event first association/location: 2026.03.28-03:38:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA