Early-est:     Kuril Islands    2025.07.31-20:59:41.74    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1753995586497.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1753995586497.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1753995586497.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: 5.1* [71]    Mwp: 5.6X [1]    Mwpd: 5.6Xinv [1]
Region: Kuril Islands
Origin Time: 2025.07.31-20:59:41.74 UTC
Hypocenter: lat: 50.65°  lon: 157.27°  [+/-22km]    depth: 15km  [+/-24km]
Location Quality: qualityCode:  B     stdErr: 1.9s   assocPhases: 120   usedPhases: 90
minDist: 9.7°   maxDist: 157.2°   AzGap: 104°   2ndAzGap: 115°   atten: -0.99 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 15km   maxHorUnc: 22km   azMaxHorUnc: 115°
68%ConfEllipsoid:   semiMajorAxisLength: 27km   majorAxisAzimuth: 118°   majorAxisPlunge: 13°   semiIntermediateAxisLength: 24km   intermediateAxisAzimuth: 239°   intermediateAxisPlunge: 65°   semiMinorAxisLength: 18km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [50]    Td: 2.8Xs [2]    Td*T50Ex: - [0]    To: 1.4s [49]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~130km
   North America / Pacific [subduction zone]: distance: ~680km
   Okhotsk / North America [subduction zone]: distance: ~680km
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 (130km)
 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.1753995586497.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 44°   dip: 9°   rake: -135°
Nodal Plane 2: strike: 269°   dip: 84°   rake: -84°
Quality: azimuthalGap: -1°   stationPolarityCount: 72   misfitWeightCount: 10.7   misfit: 0.24   stationDistributionRatio: 0.44   meanDistP: 46.9   meanDistT: 36.5   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1753995586497.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.1753995586497.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 340°   dip: 85°   rake: -147°
Nodal Plane 2: strike: 247°   dip: 57°   rake: -6°
Quality: azimuthalGap: 138°   stationPolarityCount: 72   misfit: 0.37   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 47.84   fracAcc30degPref: 0.56   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1753995586497.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1753995586497
Event info last updated: 2025.07.31-21:58:01 UTC
Event first association/location: 2025.07.31-21:06:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA