Early-est:     Northern Molucca Sea    2026.04.04-01:35:02.45    q:A      mb:5.4    Mwp:5.6*    Mwpd:-    Td*T50Ex:1.0     fmamp_polarity:./hypo.1775266501365.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775266501365.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775266501365.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 [90]    Mwp: 5.6* [21]    Mwpd: 5.8Xinv [22]
Region: Northern Molucca Sea
Origin Time: 2026.04.04-01:35:02.45 UTC
Hypocenter: lat: 1.12°  lon: 126.22°  [+/-8km]    depth: 62km  [+/-9km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 167   usedPhases: 121
minDist: 1.2°   maxDist: 159.3°   AzGap: 38°   2ndAzGap: 44°   atten: -1.11 [+/-0.15]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 7km   maxHorUnc: 8km   azMaxHorUnc: 43°
68%ConfEllipsoid:   semiMajorAxisLength: 11km   majorAxisAzimuth: 222°   majorAxisPlunge: 36°   semiIntermediateAxisLength: 9km   intermediateAxisAzimuth: 73°   intermediateAxisPlunge: 50°   semiMinorAxisLength: 8km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [69]    Td: 2.1s [22]    Td*T50Ex: 1.0 [22]    To: 10.6s [63]
Closest plate boundaries:
   Molucca Sea \ Sunda [subduction zone]: distance: ~20km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~20km
   Birds Head / Sunda [subduction zone]: distance: ~70km
   Molucca Sea / Sunda [subduction zone]: distance: ~110km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (20km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.0
   1.0
   1.0
Td*To:
     22.3
     22.3
     22.3
Mwp magnitude:
       5.6*
       5.6*
       5.6*
Hypocenter depth:
       62km
       62km
       62km
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.1775266501365.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 121°   dip: 77°   rake: 2°
Nodal Plane 2: strike: 31°   dip: 88°   rake: 167°
Quality: azimuthalGap: -1°   stationPolarityCount: 78   misfitWeightCount: 25.0   misfit: 0.08   stationDistributionRatio: 0.51   meanDistP: 21.8   meanDistT: 40.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775266501365.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 155°   dip: 44°   rake: 63°
Nodal Plane 2: strike: 10°   dip: 52°   rake: 114°
Quality: azimuthalGap: -1°   stationPolarityCount: 9   misfitWeightCount: 6.2   misfit: 0.00   stationDistributionRatio: 0.63   meanDistP: 42.5   meanDistT: 39.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1775266501365.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 176°   dip: 51°   rake: 90°
Nodal Plane 2: strike: 357°   dip: 39°   rake: 91°
Quality: azimuthalGap: 55°   stationPolarityCount: 78   misfit: 0.21   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 28.31   fracAcc30degPref: 0.82   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775266501365.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775266501365
Event info last updated: 2026.04.04-02:34:00 UTC
Event first association/location: 2026.04.04-01:38:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA