Early-est:     Off East Coast of Kamchatka    2025.07.31-20:36:08.40    q:A      mb:5.3    Mwp:5.9*    Mwpd:-    Td*T50Ex:1.2     fmamp_polarity:./hypo.1753994184480.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1753994184480.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1753994184480.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 [115]    Mwp: 5.9* [42]    Mwpd: 6.0Xinv [39]
Region: Off East Coast of Kamchatka
Origin Time: 2025.07.31-20:36:08.40 UTC
Hypocenter: lat: 52.69°  lon: 160.93°  [+/-14km]    depth: 23km  [+/-19km]
Location Quality: qualityCode:  A     stdErr: 1.9s   assocPhases: 220   usedPhases: 124
minDist: 1.4°   maxDist: 159.7°   AzGap: 96°   2ndAzGap: 98°   atten: -0.81 [+/-0.23]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 9km   maxHorUnc: 14km   azMaxHorUnc: 3°
68%ConfEllipsoid:   semiMajorAxisLength: 20km   majorAxisAzimuth: 359°   majorAxisPlunge: 57°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 186°   intermediateAxisPlunge: 33°   semiMinorAxisLength: 12km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [108]    Td: 2.8s [13]    Td*T50Ex: 1.2 [13]    To: 7.7s [99]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~40km
   North America / Pacific [subduction zone]: distance: ~350km
   Okhotsk / North America [subduction zone]: distance: ~350km
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 (40km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   1.2
   1.2
   1.2
Td*To:
     21.6
     21.6
     21.6
Mwp magnitude:
       5.9*
       5.9*
       5.9*
Hypocenter depth:
       23km
       23km
       23km
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.1753994184480.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 87°   dip: 8°   rake: -60°
Nodal Plane 2: strike: 237°   dip: 83°   rake: -94°
Quality: azimuthalGap: -1°   stationPolarityCount: 109   misfitWeightCount: 18.5   misfit: 0.19   stationDistributionRatio: 0.53   meanDistP: 43.1   meanDistT: 24.8   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1753994184480.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 126°   dip: 25°   rake: 44°
Nodal Plane 2: strike: 355°   dip: 73°   rake: 109°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 3.2   misfit: 0.00   stationDistributionRatio: 0.57   meanDistP: 49.6   meanDistT: 46.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1753994184480.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 335°   dip: 34°   rake: 168°
Nodal Plane 2: strike: 75°   dip: 84°   rake: 57°
Quality: azimuthalGap: 127°   stationPolarityCount: 109   misfit: 0.18   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 40.99   fracAcc30degPref: 0.44   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1753994184480.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1753994184480
Event info last updated: 2025.07.31-21:35:03 UTC
Event first association/location: 2025.07.31-20:41:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA