Early-est:     Tonga Islands    2026.02.14-06:44:42.33    q:C      mb:4.5*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1771051483949.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1771051483949.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1771051483949.mech.hash.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.5* [9]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2026.02.14-06:44:42.33 UTC
Hypocenter: lat: -20.93°  lon: -174.05°  [+/-23km]    depth: 162km  [+/-18km]
Location Quality: qualityCode:  C     stdErr: 2.0s   assocPhases: 15   usedPhases: 11
minDist: 4.3°   maxDist: 95.7°   AzGap: 121°   2ndAzGap: 142°   atten: -2.39 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 23km   azMaxHorUnc: 155°
68%ConfEllipsoid:   semiMajorAxisLength: 31km   majorAxisAzimuth: 154°   majorAxisPlunge: 22°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 29°   intermediateAxisPlunge: 54°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0X [3]    Td: -s [0]    Td*T50Ex: - [0]    To: 3.4Xs [2]
Closest plate boundaries:
   Tonga / Pacific [subduction zone]: distance: ~50km
   Tonga - Niuafo'ou [continental convergent boundary]: 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 (50km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       162km
       162km
       162km
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)
./hypo.1771051483949.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 175°   dip: 20°   rake: 115°
Nodal Plane 2: strike: 329°   dip: 72°   rake: 81°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 5.4   misfit: 0.09   stationDistributionRatio: 0.32   meanDistP: 53.7   meanDistT: 54.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1771051483949.mech.fmamp_polarity.mechanism.jpg
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
./hypo.1771051483949.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 222°   dip: 24°   rake: 160°
Nodal Plane 2: strike: 331°   dip: 82°   rake: 67°
Quality: azimuthalGap: 140°   stationPolarityCount: 12   misfit: 0.33   stationDistributionRatio: 0.48   rmsAngDiffAccPref: 45.33   fracAcc30degPref: 0.39   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1771051483949.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1771051483949
Event info last updated: 2026.02.14-07:43:02 UTC
Event first association/location: 2026.02.14-06:53:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA