Early-est:     Minahassa Peninsula, Sulawesi    2026.08.15-09:51:46.30    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786787506013.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786787506013.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786787506013.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: 4.8* [14]    Mwp: - [0]    Mwpd: - [0]
Region: Minahassa Peninsula, Sulawesi
Origin Time: 2026.08.15-09:51:46.30 UTC
Hypocenter: lat: -0.30°  lon: 122.11°  [+/-14km]    depth: 255km  [+/-17km]
Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 45   usedPhases: 16
minDist: 5.3°   maxDist: 61.4°   AzGap: 177°   2ndAzGap: 232°   atten: -1.46 [+/-0.41]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 146°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 322°   majorAxisPlunge: 37°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 202°   intermediateAxisPlunge: 34°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 76%
T50Ex: 0.3 [8]    Td: 0.4Xs [2]    Td*T50Ex: - [0]    To: 1.8s [7]
Closest plate boundaries:
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 76%
 76%
 76%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       255km
       255km
       255km
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.1786787506013.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 173°   dip: 20°   rake: -29°
Nodal Plane 2: strike: 290°   dip: 81°   rake: -107°
Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 4.5   misfit: 0.10   stationDistributionRatio: 0.46   meanDistP: 49.7   meanDistT: 44.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786787506013.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.1786787506013.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 200°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 41.40   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786787506013.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786787506013
Event info last updated: 2026.08.15-10:50:00 UTC
Event first association/location: 2026.08.15-09:57:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA