Early-est:     W. Caroline Islands, Micronesia    2026.08.15-22:53:01.95    q:B      mb:5.0    Mwp:5.7*    Mwpd:-    Td*T50Ex:1.3     fmamp_polarity:./hypo.1786834382133.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786834382133.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786834382133.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: 5.0 [21]    Mwp: 5.7* [6]    Mwpd: 5.9Xinv [4]
Region: W. Caroline Islands, Micronesia
Origin Time: 2026.08.15-22:53:01.95 UTC
Hypocenter: lat: 9.64°  lon: 138.51°  [+/-23km]    depth: 65km  [+/-41km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 67   usedPhases: 27
minDist: 7.4°   maxDist: 153.2°   AzGap: 50°   2ndAzGap: 75°   atten: -1.56 [+/-0.63]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 20km   maxHorUnc: 23km   azMaxHorUnc: 109°
68%ConfEllipsoid:   semiMajorAxisLength: 43km   majorAxisAzimuth: 91°   majorAxisPlunge: 70°   semiIntermediateAxisLength: 26km   intermediateAxisAzimuth: 313°   intermediateAxisPlunge: 15°   semiMinorAxisLength: 24km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [19]    Td: 2.7s [9]    Td*T50Ex: 1.3 [9]    To: 9.8s [17]
Closest plate boundaries:
   Pacific - Caroline [oceanic transform fault]: distance: ~30km
   Philippine Sea - Caroline [oceanic convergent boundary]: distance: ~30km
   Philippine Sea / Pacific [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)
 YES (30km)
 YES (30km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.3
   1.3
   1.3
Td*To:
     26.5
     26.5
     26.5
Mwp magnitude:
       5.7*
       5.7*
       5.7*
Hypocenter depth:
       65km
       65km
       65km
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.1786834382133.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 6°   dip: 24°   rake: 135°
Nodal Plane 2: strike: 139°   dip: 73°   rake: 72°
Quality: azimuthalGap: -1°   stationPolarityCount: 24   misfitWeightCount: 8.2   misfit: 0.04   stationDistributionRatio: 0.61   meanDistP: 38.2   meanDistT: 35.7   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786834382133.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.1786834382133.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 137°   dip: 81°   rake: 78°
Nodal Plane 2: strike: 9°   dip: 15°   rake: 141°
Quality: azimuthalGap: 107°   stationPolarityCount: 24   misfit: 0.17   stationDistributionRatio: 0.83   rmsAngDiffAccPref: 29.98   fracAcc30degPref: 0.69   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786834382133.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786834382133
Event info last updated: 2026.08.15-23:52:00 UTC
Event first association/location: 2026.08.15-22:59:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA