Early-est:     Balleny Islands Region    2026.03.26-01:06:26.92    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774487186697.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774487186697.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774487186697.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* [20]    Mwp: - [0]    Mwpd: - [0]
Region: Balleny Islands Region
Origin Time: 2026.03.26-01:06:26.92 UTC
Hypocenter: lat: -61.69°  lon: 154.15°  [+/-14km]    depth: 99km  [+/-19km]
Location Quality: qualityCode:  B     stdErr: 1.0s   assocPhases: 40   usedPhases: 23
minDist: 16.0°   maxDist: 176.3°   AzGap: 98°   2ndAzGap: 103°   atten: -1.95 [+/-0.34]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 11°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 166°   majorAxisPlunge: 61°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 31°   intermediateAxisPlunge: 21°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [11]    Td: 7.1Xs [2]    Td*T50Ex: - [0]    To: 1.8s [8]
Closest plate boundaries:
   Australia - Antarctica [oceanic transform fault]: 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
 no
 YES (50km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       99km
       99km
       99km
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.1774487186697.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 56°   dip: 35°   rake: 40°
Nodal Plane 2: strike: 292°   dip: 68°   rake: 119°
Quality: azimuthalGap: -1°   stationPolarityCount: 20   misfitWeightCount: 6.9   misfit: 0.18   stationDistributionRatio: 0.40   meanDistP: 52.0   meanDistT: 55.3   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774487186697.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.1774487186697.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 311°   dip: 72°   rake: 128°
Nodal Plane 2: strike: 62°   dip: 41°   rake: 27°
Quality: azimuthalGap: 148°   stationPolarityCount: 20   misfit: 0.33   stationDistributionRatio: 0.90   rmsAngDiffAccPref: 39.89   fracAcc30degPref: 0.43   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774487186697.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774487186697
Event info last updated: 2026.03.26-02:05:00 UTC
Event first association/location: 2026.03.26-01:13:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA