Early-est:     Celebes Sea    2026.03.31-11:14:23.37    q:A      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:0.0     fmamp_polarity:./hypo.1774955667703.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774955667703.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774955667703.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: 4.7* [38]    Mwp: 4.6X [2]    Mwpd: 5.1Xinv [1]
Region: Celebes Sea
Origin Time: 2026.03.31-11:14:23.37 UTC
Hypocenter: lat: 2.05°  lon: 122.00°  [+/-13km]    depth: 527km  [+/-13km]
Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 76   usedPhases: 50
minDist: 3.2°   maxDist: 159.9°   AzGap: 75°   2ndAzGap: 81°   atten: -1.40 [+/-0.24]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 87°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 266°   majorAxisPlunge: 3°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 174°   intermediateAxisPlunge: 41°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [19]    Td: 0.7s [6]    Td*T50Ex: 0.0 [6]    To: 1.2s [18]
Closest plate boundaries:
   Molucca Sea / Sunda [subduction zone]: distance: ~50km
   Molucca Sea - Sunda [oceanic transform fault]: distance: ~160km
   Banda Sea / Sunda [subduction zone]: distance: ~370km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (50km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.0
   0.0
   0.0
Td*To:
     0.8
     0.8
     0.8
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       527km
       527km
       527km
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.1774955667703.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 141°   dip: 51°   rake: 48°
Nodal Plane 2: strike: 16°   dip: 55°   rake: 130°
Quality: azimuthalGap: -1°   stationPolarityCount: 38   misfitWeightCount: 20.1   misfit: 0.13   stationDistributionRatio: 0.53   meanDistP: 24.6   meanDistT: 36.5   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774955667703.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.1774955667703.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 207°   dip: 86°   rake: -172°
Nodal Plane 2: strike: 117°   dip: 82°   rake: -4°
Quality: azimuthalGap: 75°   stationPolarityCount: 38   misfit: 0.20   stationDistributionRatio: 0.76   rmsAngDiffAccPref: 34.53   fracAcc30degPref: 0.46   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774955667703.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774955667703
Event info last updated: 2026.03.31-12:13:00 UTC
Event first association/location: 2026.03.31-11:18:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA