Early-est:     Northern Molucca Sea    2026.04.02-03:24:00.03    q:B      mb:5.4*    Mwp:6.3    Mwpd:-    Td*T50Ex:2.1     fmamp_polarity:./hypo.1775100243994.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1775100243994.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1775100243994.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* [78]    Mwp: 6.3 [15]    Mwpd: 6.5Xinv [18]
Region: Northern Molucca Sea
Origin Time: 2026.04.02-03:24:00.03 UTC
Hypocenter: lat: 1.17°  lon: 126.49°  [+/-25km]    depth: 92km  [+/-60km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 180   usedPhases: 95
minDist: 1.0°   maxDist: 173.7°   AzGap: 42°   2ndAzGap: 46°   atten: -1.12 [+/-0.17]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 22km   maxHorUnc: 25km   azMaxHorUnc: 59°
68%ConfEllipsoid:   semiMajorAxisLength: 61km   majorAxisAzimuth: 206°   majorAxisPlunge: 78°   semiIntermediateAxisLength: 30km   intermediateAxisAzimuth: 79°   intermediateAxisPlunge: 7°   semiMinorAxisLength: 26km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [73]    Td: 4.3s [26]    Td*T50Ex: 2.1 [26]    To: 21.6s [73]
Closest plate boundaries:
   Molucca Sea \ Sunda [subduction zone]: distance: ~40km
   Molucca Sea \ Birds Head [subduction zone]: distance: ~40km
   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 (40km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.1
   2.1
   2.1
Td*To:
     92.9
     92.9
     92.9
Mwp magnitude:
       6.3
       6.3
       6.3
Hypocenter depth:
       92km
       92km
       92km
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.1775100243994.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 147°   dip: 12°   rake: 20°
Nodal Plane 2: strike: 37°   dip: 86°   rake: 102°
Quality: azimuthalGap: -1°   stationPolarityCount: 84   misfitWeightCount: 28.6   misfit: 0.24   stationDistributionRatio: 0.64   meanDistP: 19.6   meanDistT: 16.4   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1775100243994.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.1775100243994.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 328°   dip: 66°   rake: 172°
Nodal Plane 2: strike: 61°   dip: 82°   rake: 24°
Quality: azimuthalGap: 52°   stationPolarityCount: 84   misfit: 0.31   stationDistributionRatio: 0.73   rmsAngDiffAccPref: 20.89   fracAcc30degPref: 0.91   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1775100243994.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1775100243994
Event info last updated: 2026.04.02-04:22:01 UTC
Event first association/location: 2026.04.02-03:28:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA