Early-est:     Macquarie Island Region    2025.07.29-07:14:22.32    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1753773261752.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1753773261752.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1753773261752.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: 4.8* [22]    Mwp: - [0]    Mwpd: - [0]
Region: Macquarie Island Region
Origin Time: 2025.07.29-07:14:22.32 UTC
Hypocenter: lat: -57.64°  lon: 157.28°  [+/-16km]    depth: 5km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 56   usedPhases: 22
minDist: 3.3°   maxDist: 158.4°   AzGap: 53°   2ndAzGap: 78°   atten: -1.13 [+/-0.33]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 16km   azMaxHorUnc: 121°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 124°   majorAxisPlunge: 18°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 218°   intermediateAxisPlunge: 12°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [15]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.2s [13]
Closest plate boundaries:
   Pacific - Australia [oceanic convergent boundary]: 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
 YES (30km)
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       5km
       5km
       5km
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.1753773261752.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 163°   dip: 28°   rake: 35°
Nodal Plane 2: strike: 41°   dip: 74°   rake: 114°
Quality: azimuthalGap: -1°   stationPolarityCount: 22   misfitWeightCount: 6.7   misfit: 0.10   stationDistributionRatio: 0.35   meanDistP: 51.0   meanDistT: 47.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1753773261752.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.1753773261752.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 273°   dip: 84°   rake: 178°
Nodal Plane 2: strike: 3°   dip: 88°   rake: 6°
Quality: azimuthalGap: 97°   stationPolarityCount: 22   misfit: 0.29   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 17.31   fracAcc30degPref: 0.99   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1753773261752.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1753773261752
Event info last updated: 2025.07.29-08:13:03 UTC
Event first association/location: 2025.07.29-07:22:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA