Early-est:     Balleny Islands Region    2026.08.15-00:40:17.30    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786754420622.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786754420622.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786754420622.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* [11]    Mwp: - [0]    Mwpd: - [0]
Region: Balleny Islands Region
Origin Time: 2026.08.15-00:40:17.30 UTC
Hypocenter: lat: -62.70°  lon: 165.12°  [+/-15km]    depth: 2km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 0.7s   assocPhases: 11   usedPhases: 10
minDist: 14.9°   maxDist: 44.5°   AzGap: 157°   2ndAzGap: 161°   atten: -1.31 [+/-0.60]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 104°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 102°   majorAxisPlunge: 10°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 349°   intermediateAxisPlunge: 67°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [6]    Td: -s [0]    Td*T50Ex: - [0]    To: 18.9s [5]
Closest plate boundaries:
   Pacific - Antarctica [oceanic transform fault]: distance: ~40km
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 (40km)
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       2km
       2km
       2km
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.1786754420622.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 52°   dip: 4°   rake: -110°
Nodal Plane 2: strike: 252°   dip: 86°   rake: -89°
Quality: azimuthalGap: -1°   stationPolarityCount: 10   misfitWeightCount: 3.8   misfit: 0.00   stationDistributionRatio: 0.26   meanDistP: 51.1   meanDistT: 46.2   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786754420622.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.1786754420622.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: 156°   stationPolarityCount: 10   misfit: 0.99   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 40.43   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786754420622.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786754420622
Event info last updated: 2026.08.15-01:39:01 UTC
Event first association/location: 2026.08.15-00:47:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA