Early-est:     Kermadec Islands, New Zealand    2026.03.31-19:24:45.91    q:B      mb:5.3    Mwp:5.7*    Mwpd:-    Td*T50Ex:0.5     fmamp_polarity:./hypo.1774985094994.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774985094994.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774985094994.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: 5.3 [61]    Mwp: 5.7* [4]    Mwpd: 5.8Xinv [4]
Region: Kermadec Islands, New Zealand
Origin Time: 2026.03.31-19:24:45.91 UTC
Hypocenter: lat: -30.39°  lon: -178.52°  [+/-23km]    depth: 86km  [+/-55km]
Location Quality: qualityCode:  B     stdErr: 1.8s   assocPhases: 151   usedPhases: 102
minDist: 9.7°   maxDist: 171.6°   AzGap: 53°   2ndAzGap: 58°   atten: -1.36 [+/-0.21]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 18km   maxHorUnc: 23km   azMaxHorUnc: 128°
68%ConfEllipsoid:   semiMajorAxisLength: 55km   majorAxisAzimuth: 51°   majorAxisPlunge: 85°   semiIntermediateAxisLength: 28km   intermediateAxisAzimuth: 308°   intermediateAxisPlunge: 1°   semiMinorAxisLength: 22km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [50]    Td: 1.3s [4]    Td*T50Ex: 0.5 [4]    To: 4.1s [50]
Closest plate boundaries:
   Kermadec - Australia [continental rift boundary]: distance: ~70km
   Kermadec / Pacific [subduction zone]: distance: ~170km
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 (170km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   0.5
   0.5
   0.5
Td*To:
     5.3
     5.3
     5.3
Mwp magnitude:
       5.7*
       5.7*
       5.7*
Hypocenter depth:
       86km
       86km
       86km
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.1774985094994.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 44°   dip: 64°   rake: -2°
Nodal Plane 2: strike: 135°   dip: 88°   rake: -154°
Quality: azimuthalGap: -1°   stationPolarityCount: 54   misfitWeightCount: 16.3   misfit: 0.11   stationDistributionRatio: 0.56   meanDistP: 25.7   meanDistT: 39.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774985094994.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.1774985094994.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 60°   dip: 38°   rake: 5°
Nodal Plane 2: strike: 326°   dip: 87°   rake: 128°
Quality: azimuthalGap: 52°   stationPolarityCount: 54   misfit: 0.30   stationDistributionRatio: 0.63   rmsAngDiffAccPref: 20.04   fracAcc30degPref: 0.95   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774985094994.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774985094994
Event info last updated: 2026.03.31-20:23:05 UTC
Event first association/location: 2026.03.31-19:35:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA