Early-est:     Tonga Islands    2026.09.29-16:12:56.99    q:B      mb:4.7*    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: 4.7* [12]    Mwp: - [0]    Mwpd: - [0] Region: Tonga Islands Origin Time: 2026.09.29-16:12:56.99 UTC Hypocenter: lat: -19.30°  lon: -173.77°  [+/-15km]    depth: 12km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 2.1s   assocPhases: 49   usedPhases: 24 minDist: 3.6°   maxDist: 157.0°   AzGap: 68°   2ndAzGap: 98°   atten: -2.17 [+/-0.35] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 4° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 6°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 101°   intermediateAxisPlunge: 21°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.5 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 27.6s [4] Closest plate boundaries:    Tonga / Pacific [subduction zone]: distance: ~90km    Tonga - Niuafo'ou [continental rift boundary]: distance: ~140km 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 (90km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        12km        12km        12km 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: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 68°   dip: 41°   rake: 92° Nodal Plane 2: strike: 245°   dip: 50°   rake: 88° Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 5.3   misfit: 0.08   stationDistributionRatio: 0.50   meanDistP: 49.9   meanDistT: 42.3   qualityCode: D 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: 9°   dip: 40°   rake: 73° Nodal Plane 2: strike: 211°   dip: 53°   rake: 104° Quality: azimuthalGap: 119°   stationPolarityCount: 14   misfit: 0.23   stationDistributionRatio: 0.58   rmsAngDiffAccPref: 43.97   fracAcc30degPref: 0.38   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1790698379369
Event info last updated: 2026.09.29-17:11:00 UTC
Event first association/location: 2026.09.29-16:19:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA