Early-est:     Northern Molucca Sea    2026.04.01-22:48:15.83    q:A      mb:6.0    Mwp:7.3*    Mwpd:7.4    Td*T50Ex:2.6     fmamp_polarity:./hypo.1775083694883.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775083694883.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775083694883.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: 6.0 [110]    Mwp: 7.3* [89]    Mwpd: 7.4 [94]
Region: Northern Molucca Sea
Origin Time: 2026.04.01-22:48:15.83 UTC
Hypocenter: lat: 1.18°  lon: 126.31°  [+/-16km]    depth: 56km  [+/-38km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 385   usedPhases: 173
minDist: 1.1°   maxDist: 173.6°   AzGap: 19°   2ndAzGap: 20°   atten: -1.28 [+/-0.15]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 16km   azMaxHorUnc: 21°
68%ConfEllipsoid:   semiMajorAxisLength: 38km   majorAxisAzimuth: 137°   majorAxisPlunge: 81°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 27°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.6 [106]    Td: 4.6s [45]    Td*T50Ex: 2.6 [45]    To: 31.2s [106]
Closest plate boundaries:
   Molucca Sea \ Sunda [subduction zone]: distance: ~30km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~30km
   Birds Head / Sunda [subduction zone]: distance: ~60km
   Molucca Sea / Sunda [subduction zone]: distance: ~120km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (30km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.6
   2.6
   2.6
Td*To:
     143.5
     143.5
     143.5
Mwp magnitude:
       7.3*
       7.3*
       7.3*
Hypocenter depth:
       56km
       56km
       56km
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.1775083694883.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 340°   dip: 38°   rake: 86°
Nodal Plane 2: strike: 165°   dip: 52°   rake: 93°
Quality: azimuthalGap: -1°   stationPolarityCount: 140   misfitWeightCount: 38.8   misfit: 0.07   stationDistributionRatio: 0.65   meanDistP: 18.2   meanDistT: 10.4   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775083694883.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 147°   dip: 44°   rake: 109°
Nodal Plane 2: strike: 302°   dip: 49°   rake: 73°
Quality: azimuthalGap: -1°   stationPolarityCount: 48   misfitWeightCount: 13.9   misfit: 0.02   stationDistributionRatio: 0.60   meanDistP: 41.5   meanDistT: 19.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1775083694883.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 326°   dip: 41°   rake: 80°
Nodal Plane 2: strike: 159°   dip: 50°   rake: 98°
Quality: azimuthalGap: 22°   stationPolarityCount: 140   misfit: 0.11   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 29.05   fracAcc30degPref: 0.65   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775083694883.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775083694883
Event info last updated: 2026.04.01-23:47:02 UTC
Event first association/location: 2026.04.01-22:51:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA