Early-est:     Tonga Islands    2025.08.06-22:08:19.92    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754518099618.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754518099618.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754518099618.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: 5.1* [30]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2025.08.06-22:08:19.92 UTC
Hypocenter: lat: -18.99°  lon: -173.15°  [+/-22km]    depth: 74km  [+/-31km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 77   usedPhases: 44
minDist: 3.0°   maxDist: 154.8°   AzGap: 84°   2ndAzGap: 96°   atten: -1.67 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 22km   azMaxHorUnc: 5°
68%ConfEllipsoid:   semiMajorAxisLength: 32km   majorAxisAzimuth: 52°   majorAxisPlunge: 69°   semiIntermediateAxisLength: 27km   intermediateAxisAzimuth: 179°   intermediateAxisPlunge: 13°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [27]    Td: 2.3Xs [1]    Td*T50Ex: - [0]    To: 4.4s [24]
Closest plate boundaries:
   Tonga / Pacific [subduction zone]: distance: ~30km
   Tonga - Niuafo'ou [continental rift boundary]: distance: ~190km
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 (30km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       74km
       74km
       74km
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.1754518099618.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 251°   dip: 18°   rake: -98°
Nodal Plane 2: strike: 79°   dip: 72°   rake: -88°
Quality: azimuthalGap: -1°   stationPolarityCount: 31   misfitWeightCount: 7.3   misfit: 0.16   stationDistributionRatio: 0.32   meanDistP: 49.6   meanDistT: 56.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754518099618.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.1754518099618.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 173°   dip: 71°   rake: 178°
Nodal Plane 2: strike: 264°   dip: 88°   rake: 19°
Quality: azimuthalGap: 136°   stationPolarityCount: 31   misfit: 0.36   stationDistributionRatio: 0.53   rmsAngDiffAccPref: 39.59   fracAcc30degPref: 0.43   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754518099618.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754518099618
Event info last updated: 2025.08.06-23:07:01 UTC
Event first association/location: 2025.08.06-22:15:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA