Early-est:     Kuril Islands    2026.08.15-00:43:24.72    q:B      mb:5.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786754603233.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786754603233.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786754603233.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: 5.4* [122]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.08.15-00:43:24.72 UTC
Hypocenter: lat: 50.34°  lon: 156.55°  [+/-25km]    depth: 15km  [+/-42km]
Location Quality: qualityCode:  B     stdErr: 1.2s   assocPhases: 172   usedPhases: 150
minDist: 12.4°   maxDist: 151.9°   AzGap: 50°   2ndAzGap: 52°   atten: -0.75 [+/-0.28]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 17km   maxHorUnc: 25km   azMaxHorUnc: 141°
68%ConfEllipsoid:   semiMajorAxisLength: 43km   majorAxisAzimuth: 152°   majorAxisPlunge: 71°   semiIntermediateAxisLength: 30km   intermediateAxisAzimuth: 316°   intermediateAxisPlunge: 19°   semiMinorAxisLength: 21km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [108]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.9s [108]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~140km
   North America / Pacific [subduction zone]: distance: ~740km
   Okhotsk / North America [subduction zone]: distance: ~740km
Subduction geometry:    Zone: Kamchatka/Kurils/Japan: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (140km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
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.1786754603233.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 275°   dip: 23°   rake: 101°
Nodal Plane 2: strike: 83°   dip: 68°   rake: 86°
Quality: azimuthalGap: -1°   stationPolarityCount: 100   misfitWeightCount: 9.1   misfit: 0.09   stationDistributionRatio: 0.42   meanDistP: 49.3   meanDistT: 37.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786754603233.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.1786754603233.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 221°   dip: 38°   rake: 91°
Nodal Plane 2: strike: 40°   dip: 52°   rake: 89°
Quality: azimuthalGap: 95°   stationPolarityCount: 101   misfit: 0.23   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 38.88   fracAcc30degPref: 0.49   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786754603233.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786754603233
Event info last updated: 2026.08.15-01:42:01 UTC
Event first association/location: 2026.08.15-00:50:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA