Early-est:     Talaud Islands, Indonesia    2026.08.09-22:17:27.46    q:C      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786313847547.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786313847547.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786313847547.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* [30]    Mwp: - [0]    Mwpd: - [0]
Region: Talaud Islands, Indonesia
Origin Time: 2026.08.09-22:17:27.46 UTC
Hypocenter: lat: 4.04°  lon: 126.95°  [+/-35km]    depth: 15km  [+/-23km]
Location Quality: qualityCode:  C     stdErr: 2.4s   assocPhases: 64   usedPhases: 37
minDist: 3.3°   maxDist: 160.8°   AzGap: 99°   2ndAzGap: 106°   atten: -0.76 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 35km   azMaxHorUnc: 68°
68%ConfEllipsoid:   semiMajorAxisLength: 44km   majorAxisAzimuth: 248°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 353°   intermediateAxisPlunge: 46°   semiMinorAxisLength: 20km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [23]    Td: -s [0]    Td*T50Ex: - [0]    To: 8.2s [18]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~160km
   Sunda - Birds Head [oceanic convergent boundary]: distance: ~190km
   Birds Head / Sunda [subduction zone]: distance: ~190km
   Molucca Sea \ Sunda [subduction zone]: distance: ~270km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~270km
   Birds Head / Philippine Sea [subduction zone]: distance: ~410km
   Molucca Sea / Sunda [subduction zone]: distance: ~440km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (160km)
 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.1786313847547.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 60°   dip: 57°   rake: 1°
Nodal Plane 2: strike: 329°   dip: 89°   rake: 147°
Quality: azimuthalGap: -1°   stationPolarityCount: 29   misfitWeightCount: 7.9   misfit: 0.09   stationDistributionRatio: 0.36   meanDistP: 50.6   meanDistT: 46.8   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786313847547.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.1786313847547.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 325°   dip: 82°   rake: 144°
Nodal Plane 2: strike: 61°   dip: 55°   rake: 10°
Quality: azimuthalGap: 106°   stationPolarityCount: 29   misfit: 0.23   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 12.56   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786313847547.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786313847547
Event info last updated: 2026.08.09-23:16:00 UTC
Event first association/location: 2026.08.09-22:24:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA