Early-est:     Tonga Islands    2025.04.12-03:16:30.24    q:C      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1744427799074.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1744427799074.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1744427799074.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: 5.2* [43]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2025.04.12-03:16:30.24 UTC
Hypocenter: lat: -16.60°  lon: -173.42°  [+/-25km]    depth: 15km  [+/-74km]
Location Quality: qualityCode:  C     stdErr: 2.4s   assocPhases: 113   usedPhases: 82
minDist: 3.1°   maxDist: 165.0°   AzGap: 46°   2ndAzGap: 67°   atten: -1.51 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 20km   maxHorUnc: 25km   azMaxHorUnc: 3°
68%ConfEllipsoid:   semiMajorAxisLength: 75km   majorAxisAzimuth: 202°   majorAxisPlunge: 81°   semiIntermediateAxisLength: 29km   intermediateAxisAzimuth: 354°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 24km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [26]    Td: 2.3Xs [1]    Td*T50Ex: - [0]    To: 1.7s [24]
Closest plate boundaries:
   Tonga / Pacific [subduction zone]: distance: ~120km
   Tonga - Niuafo'ou [continental rift boundary]: distance: ~120km
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 (120km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       15km
       15km
       15km
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.1744427799074.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 63°   dip: 34°   rake: 157°
Nodal Plane 2: strike: 173°   dip: 77°   rake: 58°
Quality: azimuthalGap: -1°   stationPolarityCount: 47   misfitWeightCount: 5.4   misfit: 0.14   stationDistributionRatio: 0.43   meanDistP: 49.3   meanDistT: 47.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1744427799074.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.1744427799074.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 218°   dip: 88°   rake: 164°
Nodal Plane 2: strike: 309°   dip: 74°   rake: 2°
Quality: azimuthalGap: 77°   stationPolarityCount: 47   misfit: 0.23   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 12.25   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1744427799074.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1744427799074
Event info last updated: 2025.04.12-04:15:02 UTC
Event first association/location: 2025.04.12-03:23:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA