Early-est:     Kuril Islands    2025.08.02-23:43:53.22    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1754178227592.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1754178227592.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1754178227592.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* [37]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2025.08.02-23:43:53.22 UTC
Hypocenter: lat: 50.36°  lon: 156.74°  [+/-55km]    depth: 90km  [+/-59km]
Location Quality: qualityCode:  C     stdErr: 1.6s   assocPhases: 96   usedPhases: 42
minDist: 2.9°   maxDist: 128.4°   AzGap: 114°   2ndAzGap: 168°   atten: -0.96 [+/-0.27]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 21km   maxHorUnc: 55km   azMaxHorUnc: 174°
68%ConfEllipsoid:   semiMajorAxisLength: 87km   majorAxisAzimuth: 355°   majorAxisPlunge: 40°   semiIntermediateAxisLength: 26km   intermediateAxisAzimuth: 138°   intermediateAxisPlunge: 44°   semiMinorAxisLength: 26km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [22]    Td: -s [0]    Td*T50Ex: - [0]    To: 9.7s [22]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~130km
   North America / Pacific [subduction zone]: distance: ~730km
   Okhotsk / North America [subduction zone]: distance: ~730km
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:
       90km
       90km
       90km
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.1754178227592.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 138°   dip: 43°   rake: 174°
Nodal Plane 2: strike: 232°   dip: 86°   rake: 47°
Quality: azimuthalGap: -1°   stationPolarityCount: 33   misfitWeightCount: 6.8   misfit: 0.07   stationDistributionRatio: 0.58   meanDistP: 38.3   meanDistT: 44.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1754178227592.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.1754178227592.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 148°   dip: 83°   rake: -178°
Nodal Plane 2: strike: 57°   dip: 88°   rake: -7°
Quality: azimuthalGap: 140°   stationPolarityCount: 33   misfit: 0.30   stationDistributionRatio: 0.76   rmsAngDiffAccPref: 25.55   fracAcc30degPref: 0.78   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1754178227592.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1754178227592
Event info last updated: 2025.08.03-00:42:01 UTC
Event first association/location: 2025.08.02-23:54:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA