Early-est:     Minahassa Peninsula, Sulawesi    2026.10.11-21:34:47.38    q:A      mb:5.4    Mwp:5.4    Mwpd:-    Td*T50Ex:0.7     fmamp_polarity:./hypo.1791754494467.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791754494467.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791754494467.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791754494467.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 5.4 [130]    Mwp: 5.4 [6]    Mwpd: 5.5Xinv [5]
Region: Minahassa Peninsula, Sulawesi
Origin Time: 2026.10.11-21:34:47.38 UTC
Hypocenter: lat: 0.62°  lon: 121.78°  [+/-15km]    depth: 31km  [+/-35km]
Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 207   usedPhases: 168
minDist: 6.0°   maxDist: 161.5°   AzGap: 32°   2ndAzGap: 36°   atten: -1.04 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 50°
68%ConfEllipsoid:   semiMajorAxisLength: 35km   majorAxisAzimuth: 294°   majorAxisPlunge: 86°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 44°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 18km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 1%
T50Ex: 0.4 [96]    Td: 1.5s [22]    Td*T50Ex: 0.7 [22]    To: 1.9s [88]
Closest plate boundaries:
   Molucca 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:
 1%
 1%
 1%
Td*T50Ex:
   0.7
   0.7
   0.7
Td*To:
     2.8
     2.8
     2.8
Mwp magnitude:
       5.4
       5.4
       5.4
Hypocenter depth:
       31km
       31km
       31km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791754494467.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 152°   dip: 68°   rake: -171°
Nodal Plane 2: strike: 59°   dip: 81°   rake: -22°
Quality: azimuthalGap: -1°   stationPolarityCount: 149   misfitWeightCount: 25.7   misfit: 0.10   stationDistributionRatio: 0.47   meanDistP: 13.1   meanDistT: 39.2   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791754494467.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 56°   dip: 19°   rake: 52°
Nodal Plane 2: strike: 276°   dip: 75°   rake: 102°
Quality: azimuthalGap: 32°   stationPolarityCount: 149   misfit: 0.28   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 30.46   fracAcc30degPref: 0.66   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791754494467.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):
Nodal Plane 1: strike: 139°   dip: 62°   rake: -180°
Nodal Plane 2: strike: 49°   dip: 90°   rake: -28°
Quality: azimuthalGap: -1°   stationPolarityCount: 36   misfitWeightCount: 8.2   misfit: 9999.90   stationDistributionRatio: 0.39   meanDistP: 17.4   meanDistT: 29.0   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_amp_aref
./hypo.1791754494467.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_mwp
./hypo.1791754494467.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791754494467
Event info last updated: 2026.10.11-22:35:05 UTC
Event first association/location: 2026.10.11-21:40:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI