Early-est:     Tonga Islands    2025.08.05-14:57:02.00    q:B      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754405826984.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754405826984.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754405826984.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: 4.6* [16]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2025.08.05-14:57:02.00 UTC
Hypocenter: lat: -19.53°  lon: -174.96°  [+/-37km]    depth: 205km  [+/-23km]
Location Quality: qualityCode:  B     stdErr: 1.9s   assocPhases: 35   usedPhases: 21
minDist: 6.9°   maxDist: 150.2°   AzGap: 159°   2ndAzGap: 257°   atten: -1.85 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 37km   azMaxHorUnc: 45°
68%ConfEllipsoid:   semiMajorAxisLength: 46km   majorAxisAzimuth: 225°   majorAxisPlunge: 1°   semiIntermediateAxisLength: 23km   intermediateAxisAzimuth: 318°   intermediateAxisPlunge: 77°   semiMinorAxisLength: 17km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [11]    Td: 7.0Xs [1]    Td*T50Ex: - [0]    To: 1.3s [11]
Closest plate boundaries:
   Tonga - Niuafo'ou [continental rift boundary]: distance: ~30km
   Niuafo'ou - Australia [oceanic transform fault]: distance: ~110km
   Tonga - Australia [oceanic spreading ridge]: distance: ~110km
   Tonga / Pacific [subduction zone]: distance: ~200km
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 (200km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       205km
       205km
       205km
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.1754405826984.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 215°   dip: 23°   rake: 110°
Nodal Plane 2: strike: 14°   dip: 69°   rake: 82°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 2.0   misfit: 0.16   stationDistributionRatio: 0.40   meanDistP: 55.3   meanDistT: 53.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754405826984.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.1754405826984.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 255°   dip: 41°   rake: -136°
Nodal Plane 2: strike: 129°   dip: 63°   rake: -58°
Quality: azimuthalGap: 127°   stationPolarityCount: 17   misfit: 0.37   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 31.01   fracAcc30degPref: 0.70   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754405826984.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754405826984
Event info last updated: 2025.08.05-15:56:04 UTC
Event first association/location: 2025.08.05-15:06:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA