Early-est:     Samoa Islands Region    2026.08.10-01:20:16.04    q:B      mb:4.8*    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: 4.8* [13]    Mwp: 4.8X [1]    Mwpd: - [0] Region: Samoa Islands Region Origin Time: 2026.08.10-01:20:16.04 UTC Hypocenter: lat: -15.39°  lon: -172.54°  [+/-14km]    depth: 68km  [+/-21km] Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 37   usedPhases: 20 minDist: 1.7°   maxDist: 148.9°   AzGap: 120°   2ndAzGap: 172°   atten: -2.18 [+/-0.24] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 20° 68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 123°   majorAxisPlunge: 69°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 28°   intermediateAxisPlunge: 2°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [7]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.8s [6] Closest plate boundaries:    Tonga / Pacific [subduction zone]: distance: ~10km    Pacific - Tonga [oceanic transform fault]: distance: ~130km    Pacific - Niuafo'ou [oceanic transform fault]: distance: ~170km    Tonga - Niuafo'ou [oceanic spreading ridge]: distance: ~170km Subduction geometry:    Zone: Kermadec-Tonga: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9 Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (10km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        68km        68km        68km 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: 134°   dip: 10°   rake: -146° Nodal Plane 2: strike: 11°   dip: 85°   rake: -82° Quality: azimuthalGap: -1°   stationPolarityCount: 13   misfitWeightCount: 4.9   misfit: 0.02   stationDistributionRatio: 0.40   meanDistP: 47.4   meanDistT: 43.9   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):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 187°   stationPolarityCount: 13   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1786324816358
Event info last updated: 2026.08.10-02:19:01 UTC
Event first association/location: 2026.08.10-01:26:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA