Early-est:     Tonga Islands    2026.02.09-18:53:04.11    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* [17]    Mwp: - [0]    Mwpd: - [0] Region: Tonga Islands Origin Time: 2026.02.09-18:53:04.11 UTC Hypocenter: lat: -16.21°  lon: -173.11°  [+/-16km]    depth: 102km  [+/-26km] Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 55   usedPhases: 34 minDist: 4.2°   maxDist: 154.0°   AzGap: 131°   2ndAzGap: 197°   atten: -2.11 [+/-0.40] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 16km   azMaxHorUnc: 79° 68%ConfEllipsoid:   semiMajorAxisLength: 27km   majorAxisAzimuth: 80°   majorAxisPlunge: 62°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 253°   intermediateAxisPlunge: 27°   semiMinorAxisLength: 17km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.3 [16]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.6s [15] Closest plate boundaries:    Tonga / Pacific [subduction zone]: distance: ~90km    Tonga - Niuafo'ou [oceanic spreading ridge]: distance: ~160km    Pacific - Tonga [oceanic transform fault]: distance: ~180km 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:        102km        102km        102km 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: 75°   dip: 17°   rake: -5° Nodal Plane 2: strike: 170°   dip: 89°   rake: -107° Quality: azimuthalGap: -1°   stationPolarityCount: 18   misfitWeightCount: 3.0   misfit: 0.12   stationDistributionRatio: 0.59   meanDistP: 49.9   meanDistT: 53.5   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):    (No solution available) Nodal Plane 1: strike: 999°   dip: 99°   rake: 999° Nodal Plane 2: strike: 324°   dip: 13°   rake: 135° Quality: azimuthalGap: 247°   stationPolarityCount: 18   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/1770663186980
Event info last updated: 2026.02.09-19:52:00 UTC
Event first association/location: 2026.02.09-19:03:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA