Early-est:     Tonga Islands    2024.12.15-15:03:42.05    q:B      mb:5.5    Mwp:5.9*    Mwpd:-    Td*T50Ex:0.0     fmamp_polarity:./hypo.1734275018520.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1734275018520.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1734275018520.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: 5.5 [97]    Mwp: 5.9* [40]    Mwpd: 6.0Xinv [42]
Region: Tonga Islands
Origin Time: 2024.12.15-15:03:42.05 UTC
Hypocenter: lat: -18.68°  lon: -175.26°  [+/-36km]    depth: 243km  [+/-41km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 300   usedPhases: 182
minDist: 5.1°   maxDist: 164.8°   AzGap: 33°   2ndAzGap: 37°   atten: -1.65 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 31km   maxHorUnc: 36km   azMaxHorUnc: 82°
68%ConfEllipsoid:   semiMajorAxisLength: 45km   majorAxisAzimuth: 258°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 42km   intermediateAxisAzimuth: 149°   intermediateAxisPlunge: 56°   semiMinorAxisLength: 37km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [98]    Td: 1.7s [26]    Td*T50Ex: 0.0 [26]    To: 2.2s [98]
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: ~250km
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 (250km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.0
   0.0
   0.0
Td*To:
     3.7
     3.7
     3.7
Mwp magnitude:
       5.9*
       5.9*
       5.9*
Hypocenter depth:
       243km
       243km
       243km
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.1734275018520.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 46°   dip: 39°   rake: -134°
Nodal Plane 2: strike: 278°   dip: 63°   rake: -60°
Quality: azimuthalGap: -1°   stationPolarityCount: 104   misfitWeightCount: 21.7   misfit: 0.09   stationDistributionRatio: 0.67   meanDistP: 22.2   meanDistT: 43.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1734275018520.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 202°   dip: 16°   rake: -86°
Nodal Plane 2: strike: 18°   dip: 74°   rake: -91°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 4.8   misfit: 0.00   stationDistributionRatio: 0.72   meanDistP: 37.2   meanDistT: 46.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1734275018520.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 193°   dip: 10°   rake: -71°
Nodal Plane 2: strike: 353°   dip: 80°   rake: -93°
Quality: azimuthalGap: 38°   stationPolarityCount: 104   misfit: 0.22   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 35.16   fracAcc30degPref: 0.58   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1734275018520.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1734275018520
Event info last updated: 2024.12.15-16:02:01 UTC
Event first association/location: 2024.12.15-15:08:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA