Early-est:     Minahassa Peninsula, Sulawesi    2025.07.23-20:50:45.06    q:A      mb:5.5    Mwp:6.3*    Mwpd:-    Td*T50Ex:0.8     fmamp_polarity:./hypo.1753303844581.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1753303844581.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1753303844581.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: 5.5 [124]    Mwp: 6.3* [87]    Mwpd: 6.3Xinv [92]
Region: Minahassa Peninsula, Sulawesi
Origin Time: 2025.07.23-20:50:45.06 UTC
Hypocenter: lat: 0.43°  lon: 122.09°  [+/-7km]    depth: 151km  [+/-11km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 478   usedPhases: 179
minDist: 5.3°   maxDist: 172.4°   AzGap: 19°   2ndAzGap: 23°   atten: -1.60 [+/-0.16]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 7km   azMaxHorUnc: 140°
68%ConfEllipsoid:   semiMajorAxisLength: 12km   majorAxisAzimuth: 136°   majorAxisPlunge: 59°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 45°   intermediateAxisPlunge: 1°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [109]    Td: 2.1s [47]    Td*T50Ex: 0.8 [47]    To: 3.8s [109]
Closest plate boundaries:
   Molucca Sea - Sunda [continental transform fault]: distance: ~190km
   Molucca Sea / Sunda [subduction zone]: distance: ~210km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (210km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.8
   0.8
   0.8
Td*To:
     8.0
     8.0
     8.0
Mwp magnitude:
       6.3*
       6.3*
       6.3*
Hypocenter depth:
       151km
       151km
       151km
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.1753303844581.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 161°   dip: 32°   rake: 120°
Nodal Plane 2: strike: 307°   dip: 63°   rake: 73°
Quality: azimuthalGap: -1°   stationPolarityCount: 132   misfitWeightCount: 44.9   misfit: 0.09   stationDistributionRatio: 0.64   meanDistP: 11.2   meanDistT: 9.6   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1753303844581.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):
Nodal Plane 1: strike: 101°   dip: 31°   rake: 77°
Nodal Plane 2: strike: 296°   dip: 60°   rake: 97°
Quality: azimuthalGap: -1°   stationPolarityCount: 57   misfitWeightCount: 18.7   misfit: 0.00   stationDistributionRatio: 0.67   meanDistP: 24.5   meanDistT: 15.4   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1753303844581.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 129°   dip: 28°   rake: 100°
Nodal Plane 2: strike: 298°   dip: 62°   rake: 85°
Quality: azimuthalGap: 23°   stationPolarityCount: 132   misfit: 0.07   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 18.02   fracAcc30degPref: 0.95   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1753303844581.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1753303844581
Event info last updated: 2025.07.23-21:49:03 UTC
Event first association/location: 2025.07.23-20:54:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA