Early-est:     Kuril Islands    2025.08.01-21:18:23.33    q:C      mb:5.0*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754083100200.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754083100200.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754083100200.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: 5.0* [21]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2025.08.01-21:18:23.33 UTC
Hypocenter: lat: 43.53°  lon: 146.23°  [+/-41km]    depth: 74km  [+/-50km]
Location Quality: qualityCode:  C     stdErr: 1.9s   assocPhases: 59   usedPhases: 25
minDist: 2.7°   maxDist: 148.1°   AzGap: 128°   2ndAzGap: 145°   atten: -1.12 [+/-0.24]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 24km   maxHorUnc: 41km   azMaxHorUnc: 153°
68%ConfEllipsoid:   semiMajorAxisLength: 61km   majorAxisAzimuth: 338°   majorAxisPlunge: 44°   semiIntermediateAxisLength: 39km   intermediateAxisAzimuth: 130°   intermediateAxisPlunge: 42°   semiMinorAxisLength: 28km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 98%
T50Ex: 0.4 [15]    Td: -s [0]    Td*T50Ex: - [0]    To: 5.1s [13]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~130km
   Pacific \ Okhotsk [subduction zone]: distance: ~330km
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:
 98%
 98%
 98%
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.1754083100200.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 88°   dip: 15°   rake: -65°
Nodal Plane 2: strike: 242°   dip: 76°   rake: -97°
Quality: azimuthalGap: -1°   stationPolarityCount: 20   misfitWeightCount: 4.3   misfit: 0.15   stationDistributionRatio: 0.51   meanDistP: 52.6   meanDistT: 53.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754083100200.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.1754083100200.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 301°   dip: 78°   rake: -158°
Nodal Plane 2: strike: 206°   dip: 68°   rake: -13°
Quality: azimuthalGap: 88°   stationPolarityCount: 20   misfit: 0.21   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 16.71   fracAcc30degPref: 0.97   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754083100200.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754083100200
Event info last updated: 2025.08.01-22:17:01 UTC
Event first association/location: 2025.08.01-21:30:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA