Early-est:     East of Kuril Islands    2025.08.05-10:15:56.61    q:B      mb:4.9*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754388952034.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754388952034.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754388952034.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: 4.9* [35]    Mwp: 5.0X [1]    Mwpd: - [0]
Region: East of Kuril Islands
Origin Time: 2025.08.05-10:15:56.61 UTC
Hypocenter: lat: 49.61°  lon: 160.08°  [+/-19km]    depth: 21km  [+/-12km]
Location Quality: qualityCode:  B     stdErr: 2.1s   assocPhases: 73   usedPhases: 40
minDist: 3.5°   maxDist: 148.0°   AzGap: 105°   2ndAzGap: 116°   atten: -1.36 [+/-0.52]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 19km   azMaxHorUnc: 23°
68%ConfEllipsoid:   semiMajorAxisLength: 24km   majorAxisAzimuth: 203°   majorAxisPlunge: 2°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 293°   intermediateAxisPlunge: 8°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [27]    Td: 1.1Xs [2]    Td*T50Ex: - [0]    To: 2.4s [25]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~90km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (90km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       21km
       21km
       21km
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.1754388952034.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 144°   dip: 42°   rake: 28°
Nodal Plane 2: strike: 32°   dip: 72°   rake: 128°
Quality: azimuthalGap: -1°   stationPolarityCount: 40   misfitWeightCount: 7.1   misfit: 0.15   stationDistributionRatio: 0.61   meanDistP: 49.7   meanDistT: 37.4   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754388952034.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.1754388952034.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 136°   dip: 44°   rake: 3°
Nodal Plane 2: strike: 44°   dip: 88°   rake: 134°
Quality: azimuthalGap: 140°   stationPolarityCount: 40   misfit: 0.38   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 32.31   fracAcc30degPref: 0.60   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754388952034.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754388952034
Event info last updated: 2025.08.05-11:14:01 UTC
Event first association/location: 2025.08.05-10:23:06 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA