Early-est:     Halmahera, Indonesia    2026.04.01-12:14:03.08    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:0.8     fmamp_polarity:     fmamp_polarity_waveform:     hash:

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details: Magnitude: mb: 5.1* [30]    Mwp: 5.7X [1]    Mwpd: 5.7Xinv [1] Region: Halmahera, Indonesia Origin Time: 2026.04.01-12:14:03.08 UTC Hypocenter: lat: -0.41°  lon: 129.75°  [+/-47km]    depth: 23km  [+/-34km] Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 52   usedPhases: 36 minDist: 2.7°   maxDist: 152.4°   AzGap: 107°   2ndAzGap: 112°   atten: -1.06 [+/-0.21] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 36km   maxHorUnc: 47km   azMaxHorUnc: 178° 68%ConfEllipsoid:   semiMajorAxisLength: 59km   majorAxisAzimuth: 178°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 45km   intermediateAxisAzimuth: 87°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 33km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [26]    Td: 1.8s [7]    Td*T50Ex: 0.8 [7]    To: 16.7s [24] Closest plate boundaries:    Birds Head / Philippine Sea [subduction zone]: distance: ~120km    Philippine Sea \ Sunda [subduction zone]: distance: ~170km    Sunda - Birds Head [continental rift boundary]: distance: ~170km    Birds Head \ Banda Sea [subduction zone]: distance: ~230km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (120km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    0.8    0.8    0.8 Td*To:      30.1      30.1      30.1 Mwp magnitude:        -        -        - Hypocenter depth:        23km        23km        23km 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)

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 92°   dip: 10°   rake: -165° Nodal Plane 2: strike: 347°   dip: 87°   rake: -80° Quality: azimuthalGap: -1°   stationPolarityCount: 32   misfitWeightCount: 8.9   misfit: 0.13   stationDistributionRatio: 0.42   meanDistP: 39.1   meanDistT: 36.9   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
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
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 112°   dip: 53°   rake: 173° Nodal Plane 2: strike: 207°   dip: 84°   rake: 37° Quality: azimuthalGap: 107°   stationPolarityCount: 32   misfit: 0.25   stationDistributionRatio: 0.81   rmsAngDiffAccPref: 28.67   fracAcc30degPref: 0.80   qualityCode: C Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1775045643228
Event info last updated: 2026.04.01-13:13:01 UTC
Event first association/location: 2026.04.01-12:20:05 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA