Early-est:     West of Macquarie Island    2024.12.19-02:07:06.74    q:B      mb:5.1*    Mwp:5.8    Mwpd:-    Td*T50Ex:1.6     fmamp_polarity:./hypo.1734574027566.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1734574027566.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1734574027566.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: 5.1* [27]    Mwp: 5.8 [5]    Mwpd: 5.8Xinv [3]
Region: West of Macquarie Island
Origin Time: 2024.12.19-02:07:06.74 UTC
Hypocenter: lat: -56.26°  lon: 147.42°  [+/-29km]    depth: 15km  [+/-33km]
Location Quality: qualityCode:  B     stdErr: 1.9s   assocPhases: 84   usedPhases: 55
minDist: 6.8°   maxDist: 154.2°   AzGap: 65°   2ndAzGap: 83°   atten: -0.82 [+/-0.37]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 25km   maxHorUnc: 29km   azMaxHorUnc: 12°
68%ConfEllipsoid:   semiMajorAxisLength: 36km   majorAxisAzimuth: 178°   majorAxisPlunge: 22°   semiIntermediateAxisLength: 35km   intermediateAxisAzimuth: 65°   intermediateAxisPlunge: 44°   semiMinorAxisLength: 29km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [25]    Td: 4.5s [5]    Td*T50Ex: 1.6 [5]    To: 6.7s [20]
Closest plate boundaries:
   Australia - Antarctica [oceanic transform fault]: distance: ~10km
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 (10km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.6
   1.6
   1.6
Td*To:
     30.2
     30.2
     30.2
Mwp magnitude:
       5.8
       5.8
       5.8
Hypocenter depth:
       15km
       15km
       15km
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.1734574027566.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 60°   dip: 12°   rake: -115°
Nodal Plane 2: strike: 265°   dip: 79°   rake: -85°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 7.8   misfit: 0.15   stationDistributionRatio: 0.43   meanDistP: 50.1   meanDistT: 46.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1734574027566.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.1734574027566.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 326°   dip: 79°   rake: -157°
Nodal Plane 2: strike: 231°   dip: 68°   rake: -12°
Quality: azimuthalGap: 93°   stationPolarityCount: 26   misfit: 0.35   stationDistributionRatio: 0.84   rmsAngDiffAccPref: 39.30   fracAcc30degPref: 0.58   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1734574027566.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1734574027566
Event info last updated: 2024.12.19-03:06:01 UTC
Event first association/location: 2024.12.19-02:13:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA