Early-est:     Northern Molucca Sea    2026.04.02-14:13:50.25    q:B      mb:5.4    Mwp:5.8*    Mwpd:-    Td*T50Ex:1.8     fmamp_polarity:./hypo.1775139235188.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775139235188.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775139235188.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: 5.4 [73]    Mwp: 5.8* [30]    Mwpd: 6.0Xinv [27]
Region: Northern Molucca Sea
Origin Time: 2026.04.02-14:13:50.25 UTC
Hypocenter: lat: 1.45°  lon: 126.61°  [+/-27km]    depth: 30km  [+/-31km]
Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 170   usedPhases: 98
minDist: 1.0°   maxDist: 159.2°   AzGap: 34°   2ndAzGap: 44°   atten: -0.90 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 27km   maxHorUnc: 27km   azMaxHorUnc: 79°
68%ConfEllipsoid:   semiMajorAxisLength: 35km   majorAxisAzimuth: 225°   majorAxisPlunge: 34°   semiIntermediateAxisLength: 33km   intermediateAxisAzimuth: 132°   intermediateAxisPlunge: 5°   semiMinorAxisLength: 28km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [70]    Td: 3.5s [33]    Td*T50Ex: 1.8 [33]    To: 21.0s [69]
Closest plate boundaries:
   Birds Head / Sunda [subduction zone]: distance: ~30km
   Molucca Sea \ Sunda [subduction zone]: distance: ~30km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~30km
   Sunda - Birds Head [oceanic convergent boundary]: distance: ~100km
   Molucca Sea / Sunda [subduction zone]: distance: ~160km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (30km)
 YES (100km)
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.8
   1.8
   1.8
Td*To:
     73.5
     73.5
     73.5
Mwp magnitude:
       5.8*
       5.8*
       5.8*
Hypocenter depth:
       30km
       30km
       30km
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.1775139235188.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 82°   dip: 8°   rake: -8°
Nodal Plane 2: strike: 180°   dip: 89°   rake: -98°
Quality: azimuthalGap: -1°   stationPolarityCount: 65   misfitWeightCount: 20.8   misfit: 0.10   stationDistributionRatio: 0.47   meanDistP: 27.4   meanDistT: 26.4   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775139235188.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.1775139235188.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 270°   dip: 20°   rake: 167°
Nodal Plane 2: strike: 12°   dip: 86°   rake: 70°
Quality: azimuthalGap: 68°   stationPolarityCount: 65   misfit: 0.23   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 27.43   fracAcc30degPref: 0.76   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775139235188.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775139235188
Event info last updated: 2026.04.02-15:12:06 UTC
Event first association/location: 2026.04.02-14:18:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA