Early-est:     Halmahera, Indonesia    2026.06.23-12:13:24.61    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:0.1     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: 4.8* [30]    Mwp: 4.3X [1]    Mwpd: - [0] Region: Halmahera, Indonesia Origin Time: 2026.06.23-12:13:24.61 UTC Hypocenter: lat: 2.47°  lon: 128.72°  [+/-28km]    depth: 230km  [+/-31km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 58   usedPhases: 37 minDist: 2.2°   maxDist: 158.4°   AzGap: 61°   2ndAzGap: 82°   atten: -1.45 [+/-0.29] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 18km   maxHorUnc: 28km   azMaxHorUnc: 70° 68%ConfEllipsoid:   semiMajorAxisLength: 37km   majorAxisAzimuth: 246°   majorAxisPlunge: 34°   semiIntermediateAxisLength: 28km   intermediateAxisAzimuth: 95°   intermediateAxisPlunge: 52°   semiMinorAxisLength: 22km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 80% T50Ex: 0.3 [24]    Td: 0.4s [6]    Td*T50Ex: 0.1 [6]    To: 1.3s [24] Closest plate boundaries:    Philippine Sea \ Sunda [subduction zone]: distance: ~60km    Sunda - Birds Head [continental convergent boundary]: distance: ~70km    Birds Head / Philippine Sea [subduction zone]: distance: ~170km    Birds Head / Sunda [subduction zone]: distance: ~210km    Molucca Sea \ Sunda [subduction zone]: distance: ~270km    Molucca Sea \ Birds Head [subduction zone]: distance: ~270km    Molucca Sea / Sunda [subduction zone]: distance: ~400km Subduction geometry: none or not available Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (60km)  YES (70km)  no Prob underwater:  80%  80%  80% Td*T50Ex:    0.1    0.1    0.1 Td*To:      0.5      0.5      0.5 Mwp magnitude:        -        -        - Hypocenter depth:        230km        230km        230km 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): Nodal Plane 1: strike: 73°   dip: 8°   rake: -10° Nodal Plane 2: strike: 172°   dip: 89°   rake: -98° Quality: azimuthalGap: -1°   stationPolarityCount: 30   misfitWeightCount: 12.6   misfit: 0.14   stationDistributionRatio: 0.58   meanDistP: 24.9   meanDistT: 30.8   qualityCode: B 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): Nodal Plane 1: strike: 78°   dip: 10°   rake: -7° Nodal Plane 2: strike: 175°   dip: 89°   rake: -100° Quality: azimuthalGap: 61°   stationPolarityCount: 31   misfit: 0.33   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 21.86   fracAcc30degPref: 0.92   qualityCode: B Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1782216804884
Event info last updated: 2026.06.23-13:12:00 UTC
Event first association/location: 2026.06.23-12:18:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA