Early-est:     Off E. Coast of N. Island, N.Z.    2026.08.10-07:17:34.81    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786346254756.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786346254756.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786346254756.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: 4.7* [8]    Mwp: 5.8X [1]    Mwpd: - [0]
Region: Off E. Coast of N. Island, N.Z.
Origin Time: 2026.08.10-07:17:34.81 UTC
Hypocenter: lat: -37.61°  lon: 177.09°  [+/-17km]    depth: 71km  [+/-22km]
Location Quality: qualityCode:  B     stdErr: 1.3s   assocPhases: 30   usedPhases: 15
minDist: 1.6°   maxDist: 148.5°   AzGap: 228°   2ndAzGap: 243°   atten: -1.46 [+/-0.24]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 17km   azMaxHorUnc: 89°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 236°   majorAxisPlunge: 54°   semiIntermediateAxisLength: 20km   intermediateAxisAzimuth: 112°   intermediateAxisPlunge: 22°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [5]    Td: -s [0]    Td*T50Ex: - [0]    To: 6.2s [5]
Closest plate boundaries:
   Kermadec - Australia [continental rift boundary]: distance: ~30km
   Kermadec / Pacific [subduction zone]: distance: ~220km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (220km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       71km
       71km
       71km
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.1786346254756.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 155°   dip: 23°   rake: 90°
Nodal Plane 2: strike: 335°   dip: 67°   rake: 90°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 5.0   misfit: 0.00   stationDistributionRatio: 0.57   meanDistP: 50.4   meanDistT: 43.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786346254756.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.1786346254756.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 212°   dip: 51°   rake: 133°
Nodal Plane 2: strike: 336°   dip: 56°   rake: 50°
Quality: azimuthalGap: 73°   stationPolarityCount: 12   misfit: 0.00   stationDistributionRatio: 0.49   rmsAngDiffAccPref: 25.51   fracAcc30degPref: 0.79   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786346254756.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786346254756
Event info last updated: 2026.08.10-08:16:00 UTC
Event first association/location: 2026.08.10-07:23:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA