Early-est:     Kuril Islands    2025.08.01-20:07:56.98    q:A      mb:5.3*    Mwp:-    Mwpd:-    Td*T50Ex:0.6     fmamp_polarity:./hypo.1754078878022.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754078878022.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754078878022.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: 5.3* [144]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2025.08.01-20:07:56.98 UTC
Hypocenter: lat: 50.28°  lon: 156.44°  [+/-12km]    depth: 71km  [+/-17km]
Location Quality: qualityCode:  A     stdErr: 1.5s   assocPhases: 203   usedPhases: 171
minDist: 3.1°   maxDist: 151.0°   AzGap: 44°   2ndAzGap: 57°   atten: -0.89 [+/-0.19]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 12km   azMaxHorUnc: 85°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 246°   majorAxisPlunge: 68°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 138°   intermediateAxisPlunge: 7°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [119]    Td: 1.7s [8]    Td*T50Ex: 0.6 [8]    To: 1.9s [117]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~140km
   North America / Pacific [subduction zone]: distance: ~750km
   Okhotsk / North America [subduction zone]: distance: ~750km
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:
   0.6
   0.6
   0.6
Td*To:
     3.2
     3.2
     3.2
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       71km
       71km
       71km
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.1754078878022.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 149°   dip: 44°   rake: 87°
Nodal Plane 2: strike: 333°   dip: 46°   rake: 93°
Quality: azimuthalGap: -1°   stationPolarityCount: 125   misfitWeightCount: 21.7   misfit: 0.19   stationDistributionRatio: 0.70   meanDistP: 39.8   meanDistT: 23.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754078878022.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.1754078878022.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 240°   dip: 36°   rake: 96°
Nodal Plane 2: strike: 52°   dip: 54°   rake: 85°
Quality: azimuthalGap: 86°   stationPolarityCount: 126   misfit: 0.26   stationDistributionRatio: 0.74   rmsAngDiffAccPref: 37.58   fracAcc30degPref: 0.51   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754078878022.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754078878022
Event info last updated: 2025.08.01-21:06:01 UTC
Event first association/location: 2025.08.01-20:15:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA