Early-est:     Kuril Islands    2026.08.11-12:13:34.50    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1786450414329.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1786450414329.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1786450414329.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* [19]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.08.11-12:13:34.50 UTC
Hypocenter: lat: 49.38°  lon: 153.25°  [+/-12km]    depth: 74km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 41   usedPhases: 23
minDist: 10.2°   maxDist: 148.4°   AzGap: 135°   2ndAzGap: 144°   atten: -0.85 [+/-0.41]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 12km   azMaxHorUnc: 159°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 190°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 331°   intermediateAxisPlunge: 18°   semiMinorAxisLength: 11km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.3s [10]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~260km
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 (260km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       74km
       74km
       74km
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.1786450414329.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 126°   dip: 23°   rake: 159°
Nodal Plane 2: strike: 236°   dip: 82°   rake: 68°
Quality: azimuthalGap: -1°   stationPolarityCount: 16   misfitWeightCount: 3.8   misfit: 0.07   stationDistributionRatio: 0.43   meanDistP: 51.3   meanDistT: 54.8   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1786450414329.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.1786450414329.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: 162°   stationPolarityCount: 16   misfit: 0.99   stationDistributionRatio: 0.79   rmsAngDiffAccPref: 34.28   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1786450414329.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1786450414329
Event info last updated: 2026.08.11-13:12:00 UTC
Event first association/location: 2026.08.11-12:21:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA