Early-est:     West of Macquarie Island    2026.10.08-06:46:50.06    q:A      mb:5.0    Mwp:5.6    Mwpd:-    Td*T50Ex:2.2     fmamp_polarity:./hypo.1791442010946.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791442010946.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791442010946.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791442010946.mech.fmamp_amp_mwp.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 [37]    Mwp: 5.6 [5]    Mwpd: 5.8Xinv [3]
Region: West of Macquarie Island
Origin Time: 2026.10.08-06:46:50.06 UTC
Hypocenter: lat: -52.49°  lon: 140.22°  [+/-13km]    depth: 5km  [+/-17km]
Location Quality: qualityCode:  A     stdErr: 2.0s   assocPhases: 83   usedPhases: 62
minDist: 10.7°   maxDist: 170.8°   AzGap: 56°   2ndAzGap: 60°   atten: -1.86 [+/-0.63]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 13km   azMaxHorUnc: 46°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 251°   majorAxisPlunge: 50°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 14°   intermediateAxisPlunge: 24°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [28]    Td: 5.5s [7]    Td*T50Ex: 2.2 [7]    To: 9.2s [23]
Closest plate boundaries:
   Australia - Antarctica [oceanic transform fault]: distance: ~30km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 YES (30km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.2
   2.2
   2.2
Td*To:
     50.6
     50.6
     50.6
Mwp magnitude:
       5.6
       5.6
       5.6
Hypocenter depth:
       5km
       5km
       5km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791442010946.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 2°   dip: 41°   rake: -100°
Nodal Plane 2: strike: 195°   dip: 50°   rake: -81°
Quality: azimuthalGap: -1°   stationPolarityCount: 58   misfitWeightCount: 10.6   misfit: 0.24   stationDistributionRatio: 0.66   meanDistP: 26.0   meanDistT: 45.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791442010946.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 13°   dip: 41°   rake: -89°
Nodal Plane 2: strike: 192°   dip: 49°   rake: -91°
Quality: azimuthalGap: 55°   stationPolarityCount: 58   misfit: 0.38   stationDistributionRatio: 0.59   rmsAngDiffAccPref: 40.26   fracAcc30degPref: 0.47   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791442010946.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_aref
./hypo.1791442010946.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_mwp
./hypo.1791442010946.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791442010946
Event info last updated: 2026.10.08-07:47:02 UTC
Event first association/location: 2026.10.08-06:52:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI