Early-est:     Halmahera, Indonesia    2026.08.11-20:14:21.58    q:B      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     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: 5.0* [25]    Mwp: 4.9X [1]    Mwpd: - [0] Region: Halmahera, Indonesia Origin Time: 2026.08.11-20:14:21.58 UTC Hypocenter: lat: 1.68°  lon: 128.38°  [+/-31km]    depth: 15km  [+/-33km] Location Quality: qualityCode:  B     stdErr: 2.1s   assocPhases: 56   usedPhases: 29 minDist: 1.4°   maxDist: 146.1°   AzGap: 105°   2ndAzGap: 108°   atten: -1.02 [+/-0.30] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 26km   maxHorUnc: 31km   azMaxHorUnc: 45° 68%ConfEllipsoid:   semiMajorAxisLength: 39km   majorAxisAzimuth: 226°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 34km   intermediateAxisAzimuth: 321°   intermediateAxisPlunge: 49°   semiMinorAxisLength: 31km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [20]    Td: 1.4Xs [1]    Td*T50Ex: - [0]    To: 10.1s [19] Closest plate boundaries:    Sunda - Birds Head [continental transform fault]: distance: ~40km    Philippine Sea \ Sunda [subduction zone]: distance: ~100km    Birds Head / Philippine Sea [subduction zone]: distance: ~110km    Birds Head / Sunda [subduction zone]: distance: ~180km    Molucca Sea \ Sunda [subduction zone]: distance: ~220km    Molucca Sea \ Birds Head [subduction zone]: distance: ~220km    Molucca Sea / Sunda [subduction zone]: distance: ~320km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (100km)  no  YES (40km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        15km        15km        15km 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: 53°   dip: 59°   rake: -32° Nodal Plane 2: strike: 161°   dip: 63°   rake: -144° Quality: azimuthalGap: -1°   stationPolarityCount: 23   misfitWeightCount: 9.3   misfit: 0.12   stationDistributionRatio: 0.38   meanDistP: 37.9   meanDistT: 51.5   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: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 244°   dip: 76°   rake: 95° Nodal Plane 2: strike: 43°   dip: 14°   rake: 70° Quality: azimuthalGap: 105°   stationPolarityCount: 23   misfit: 0.28   stationDistributionRatio: 0.78   rmsAngDiffAccPref: 41.04   fracAcc30degPref: 0.43   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1786479259613
Event info last updated: 2026.08.11-21:13:00 UTC
Event first association/location: 2026.08.11-20:20:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA