Early-est:     Talaud Islands, Indonesia    2026.08.09-13:47:05.96    q:B      mb:4.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786283227184.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786283227184.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786283227184.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: 4.4* [13]    Mwp: - [0]    Mwpd: - [0]
Region: Talaud Islands, Indonesia
Origin Time: 2026.08.09-13:47:05.96 UTC
Hypocenter: lat: 4.83°  lon: 125.77°  [+/-15km]    depth: 152km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 21   usedPhases: 19
minDist: 2.2°   maxDist: 150.0°   AzGap: 134°   2ndAzGap: 164°   atten: -1.78 [+/-0.42]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 15km   azMaxHorUnc: 96°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 275°   majorAxisPlunge: 33°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 112°   intermediateAxisPlunge: 56°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.9s [6]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~200km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (200km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       152km
       152km
       152km
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.1786283227184.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 216°   dip: 80°   rake: -178°
Nodal Plane 2: strike: 126°   dip: 88°   rake: -10°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 3.1   misfit: 0.09   stationDistributionRatio: 0.56   meanDistP: 55.3   meanDistT: 56.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786283227184.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.1786283227184.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 208°   dip: 67°   rake: 163°
Nodal Plane 2: strike: 305°   dip: 74°   rake: 23°
Quality: azimuthalGap: 147°   stationPolarityCount: 12   misfit: 0.25   stationDistributionRatio: 0.92   rmsAngDiffAccPref: 43.03   fracAcc30degPref: 0.41   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786283227184.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786283227184
Event info last updated: 2026.08.09-14:46:00 UTC
Event first association/location: 2026.08.09-13:52:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA