Early-est:     Banda Sea    2026.03.28-18:38:33.88    q:B      mb:5.5    Mwp:6.0*    Mwpd:-    Td*T50Ex:0.7     fmamp_polarity:./hypo.1774723110517.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774723110517.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774723110517.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: 5.5 [82]    Mwp: 6.0* [35]    Mwpd: 6.1Xinv [42]
Region: Banda Sea
Origin Time: 2026.03.28-18:38:33.88 UTC
Hypocenter: lat: -7.51°  lon: 127.80°  [+/-22km]    depth: 207km  [+/-49km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 306   usedPhases: 155
minDist: 4.1°   maxDist: 177.6°   AzGap: 19°   2ndAzGap: 24°   atten: -1.72 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 22km   azMaxHorUnc: 10°
68%ConfEllipsoid:   semiMajorAxisLength: 49km   majorAxisAzimuth: 89°   majorAxisPlunge: 80°   semiIntermediateAxisLength: 27km   intermediateAxisAzimuth: 189°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [88]    Td: 1.4s [35]    Td*T50Ex: 0.7 [35]    To: 4.9s [86]
Closest plate boundaries:
   Banda Sea - Timor [oceanic convergent boundary]: distance: ~60km
   Timor - Australia [oceanic transform fault]: distance: ~180km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 YES (60km)
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.7
   0.7
   0.7
Td*To:
     6.9
     6.9
     6.9
Mwp magnitude:
       6.0*
       6.0*
       6.0*
Hypocenter depth:
       207km
       207km
       207km
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.1774723110517.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 95°   dip: 37°   rake: 14°
Nodal Plane 2: strike: 354°   dip: 82°   rake: 126°
Quality: azimuthalGap: -1°   stationPolarityCount: 96   misfitWeightCount: 36.2   misfit: 0.06   stationDistributionRatio: 0.60   meanDistP: 13.1   meanDistT: 10.6   qualityCode: A
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774723110517.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 116°   dip: 24°   rake: 9°
Nodal Plane 2: strike: 18°   dip: 86°   rake: 114°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 5.7   misfit: 0.00   stationDistributionRatio: 0.58   meanDistP: 45.6   meanDistT: 32.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1774723110517.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 98°   dip: 30°   rake: 17°
Nodal Plane 2: strike: 353°   dip: 82°   rake: 119°
Quality: azimuthalGap: 23°   stationPolarityCount: 96   misfit: 0.14   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 11.89   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774723110517.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774723110517
Event info last updated: 2026.03.28-19:37:01 UTC
Event first association/location: 2026.03.28-18:41:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA