Early-est:     Tonga Islands    2025.04.12-04:48:17.42    q:B      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1744433294997.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1744433294997.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1744433294997.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: 5.0* [14]    Mwp: - [0]    Mwpd: - [0]
Region: Tonga Islands
Origin Time: 2025.04.12-04:48:17.42 UTC
Hypocenter: lat: -16.24°  lon: -173.30°  [+/-16km]    depth: 134km  [+/-18km]
Location Quality: qualityCode:  B     stdErr: 2.1s   assocPhases: 48   usedPhases: 20
minDist: 2.8°   maxDist: 147.9°   AzGap: 81°   2ndAzGap: 152°   atten: -1.80 [+/-0.42]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 16km   azMaxHorUnc: 10°
68%ConfEllipsoid:   semiMajorAxisLength: 22km   majorAxisAzimuth: 7°   majorAxisPlunge: 41°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 212°   intermediateAxisPlunge: 46°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.8s [9]
Closest plate boundaries:
   Tonga / Pacific [subduction zone]: distance: ~110km
   Tonga - Niuafo'ou [oceanic spreading ridge]: distance: ~140km
   Pacific - Tonga [oceanic transform fault]: distance: ~180km
   Pacific - Niuafo'ou [oceanic transform fault]: 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 (110km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       134km
       134km
       134km
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.1744433294997.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 301°   dip: 26°   rake: -118°
Nodal Plane 2: strike: 152°   dip: 67°   rake: -77°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 5.5   misfit: 0.02   stationDistributionRatio: 0.58   meanDistP: 45.2   meanDistT: 45.0   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1744433294997.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.1744433294997.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 314°   dip: 30°   rake: -114°
Nodal Plane 2: strike: 161°   dip: 63°   rake: -77°
Quality: azimuthalGap: 113°   stationPolarityCount: 15   misfit: 0.31   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 41.08   fracAcc30degPref: 0.42   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1744433294997.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1744433294997
Event info last updated: 2025.04.12-05:47:00 UTC
Event first association/location: 2025.04.12-04:55:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA