Early-est:     Minahassa Peninsula, Sulawesi    2026.06.19-18:53:09.54    q:B      mb:4.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1781895189473.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781895189473.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781895189473.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: 4.2* [7]    Mwp: - [0]    Mwpd: - [0]
Region: Minahassa Peninsula, Sulawesi
Origin Time: 2026.06.19-18:53:09.54 UTC
Hypocenter: lat: 1.62°  lon: 124.69°  [+/-16km]    depth: 192km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 35   usedPhases: 13
minDist: 2.8°   maxDist: 62.6°   AzGap: 136°   2ndAzGap: 150°   atten: -0.87 [+/-0.43]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 16km   azMaxHorUnc: 77°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 80°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 182°   intermediateAxisPlunge: 41°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.5s [4]
Closest plate boundaries:
   Molucca Sea - Sunda [continental transform fault]: distance: ~130km
   Molucca Sea / Sunda [subduction zone]: distance: ~150km
   Molucca Sea \ Sunda [subduction zone]: distance: ~180km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~180km
   Birds Head / 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 (150km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       192km
       192km
       192km
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.1781895189473.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 17°   dip: 39°   rake: 158°
Nodal Plane 2: strike: 125°   dip: 76°   rake: 53°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 5.1   misfit: 0.03   stationDistributionRatio: 0.39   meanDistP: 46.8   meanDistT: 51.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781895189473.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.1781895189473.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: 161°   stationPolarityCount: 10   misfit: 0.99   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 17.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781895189473.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781895189473
Event info last updated: 2026.06.19-19:52:00 UTC
Event first association/location: 2026.06.19-19:04:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA