Early-est:     Tonga Islands    2026.03.25-10:11:00.77    q:A      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774433460734.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774433460734.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774433460734.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* [86]    Mwp: 5.9X [2]    Mwpd: 5.9Xinv [2]
Region: Tonga Islands
Origin Time: 2026.03.25-10:11:00.77 UTC
Hypocenter: lat: -15.62°  lon: -174.37°  [+/-13km]    depth: 199km  [+/-16km]
Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 228   usedPhases: 157
minDist: 3.0°   maxDist: 160.7°   AzGap: 34°   2ndAzGap: 42°   atten: -1.42 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 10km   maxHorUnc: 13km   azMaxHorUnc: 93°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 267°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 97°   intermediateAxisPlunge: 35°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [65]    Td: 1.6Xs [2]    Td*T50Ex: - [0]    To: 2.2s [63]
Closest plate boundaries:
   Tonga - Niuafo'ou [oceanic transform fault]: distance: ~40km
   Pacific - Niuafo'ou [oceanic transform fault]: distance: ~130km
   Pacific - Tonga [oceanic transform fault]: distance: ~130km
   Tonga / Pacific [subduction zone]: distance: ~150km
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 (150km)
 no
 YES (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       199km
       199km
       199km
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.1774433460734.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 175°   dip: 16°   rake: -109°
Nodal Plane 2: strike: 15°   dip: 75°   rake: -85°
Quality: azimuthalGap: -1°   stationPolarityCount: 83   misfitWeightCount: 14.9   misfit: 0.19   stationDistributionRatio: 0.65   meanDistP: 32.0   meanDistT: 39.0   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774433460734.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.1774433460734.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 23°   dip: 74°   rake: -66°
Nodal Plane 2: strike: 144°   dip: 28°   rake: -145°
Quality: azimuthalGap: 41°   stationPolarityCount: 83   misfit: 0.37   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 26.03   fracAcc30degPref: 0.63   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774433460734.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774433460734
Event info last updated: 2026.03.25-11:09:01 UTC
Event first association/location: 2026.03.25-10:17:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA