Early-est:     Tonga Islands    2026.02.13-00:41:28.41    q:C      mb:5.1*    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: 5.1* [23]    Mwp: - [0]    Mwpd: - [0] Region: Tonga Islands Origin Time: 2026.02.13-00:41:28.41 UTC Hypocenter: lat: -15.17°  lon: -173.08°  [+/-24km]    depth: 30km  [+/-50km] Location Quality: qualityCode:  C     stdErr: 1.6s   assocPhases: 61   usedPhases: 36 minDist: 4.9°   maxDist: 149.0°   AzGap: 74°   2ndAzGap: 92°   atten: -1.87 [+/-0.17] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 24km   azMaxHorUnc: 49° 68%ConfEllipsoid:   semiMajorAxisLength: 52km   majorAxisAzimuth: 64°   majorAxisPlunge: 71°   semiIntermediateAxisLength: 27km   intermediateAxisAzimuth: 220°   intermediateAxisPlunge: 17°   semiMinorAxisLength: 18km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [16]    Td: 2.6Xs [1]    Td*T50Ex: - [0]    To: 1.5s [15] Closest plate boundaries:    Tonga / Pacific [subduction zone]: distance: ~40km    Pacific - Tonga [oceanic transform fault]: distance: ~70km    Tonga - Niuafo'ou [oceanic spreading ridge]: distance: ~110km    Pacific - Niuafo'ou [oceanic transform fault]: distance: ~110km 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 (40km)  no  YES (70km) Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        30km        30km        30km 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: 71°   dip: 48°   rake: 144° Nodal Plane 2: strike: 187°   dip: 64°   rake: 48° Quality: azimuthalGap: -1°   stationPolarityCount: 25   misfitWeightCount: 4.3   misfit: 0.07   stationDistributionRatio: 0.30   meanDistP: 54.2   meanDistT: 54.3   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: 131°   dip: 23°   rake: -176° Nodal Plane 2: strike: 37°   dip: 88°   rake: -67° Quality: azimuthalGap: 101°   stationPolarityCount: 25   misfit: 0.30   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 36.83   fracAcc30degPref: 0.49   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2

Event ID: smi:alomax.net_BETA/author/ee/event/1770943289896
Event info last updated: 2026.02.13-01:40:01 UTC
Event first association/location: 2026.02.13-00:56:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA