Early-est:     Macquarie Island Region    2025.07.29-23:57:21.22    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1753833442122.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1753833442122.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1753833442122.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: 4.9* [10]    Mwp: - [0]    Mwpd: - [0]
Region: Macquarie Island Region
Origin Time: 2025.07.29-23:57:21.22 UTC
Hypocenter: lat: -54.82°  lon: 157.80°  [+/-13km]    depth: 252km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 80   usedPhases: 12
minDist: 12.8°   maxDist: 153.8°   AzGap: 99°   2ndAzGap: 164°   atten: -0.93 [+/-0.33]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 13km   azMaxHorUnc: 6°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 5°   majorAxisPlunge: 31°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 192°   intermediateAxisPlunge: 59°   semiMinorAxisLength: 11km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 8.1s [5]
Closest plate boundaries:
   Pacific - Australia [oceanic convergent boundary]: distance: ~50km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 YES (50km)
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       252km
       252km
       252km
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.1753833442122.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 123°   dip: 13°   rake: 125°
Nodal Plane 2: strike: 267°   dip: 80°   rake: 83°
Quality: azimuthalGap: -1°   stationPolarityCount: 12   misfitWeightCount: 4.9   misfit: 0.06   stationDistributionRatio: 0.49   meanDistP: 40.5   meanDistT: 45.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1753833442122.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.1753833442122.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 178°   stationPolarityCount: 12   misfit: 0.99   stationDistributionRatio: 0.77   rmsAngDiffAccPref: 31.37   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1753833442122.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1753833442122
Event info last updated: 2025.07.30-00:56:06 UTC
Event first association/location: 2025.07.30-00:19:15 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA