Early-est:     Off East Coast of Kamchatka    2026.06.19-06:52:37.51    q:A      mb:5.5    Mwp:6.6*    Mwpd:-    Td*T50Ex:2.6     fmamp_polarity:./hypo.1781851954211.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1781851954211.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1781851954211.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: 5.5 [101]    Mwp: 6.6* [96]    Mwpd: 6.8Xinv [91]
Region: Off East Coast of Kamchatka
Origin Time: 2026.06.19-06:52:37.51 UTC
Hypocenter: lat: 52.80°  lon: 160.33°  [+/-15km]    depth: 23km  [+/-17km]
Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 283   usedPhases: 131
minDist: 15.4°   maxDist: 145.8°   AzGap: 57°   2ndAzGap: 75°   atten: -0.84 [+/-0.36]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 151°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 144°   majorAxisPlunge: 25°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 15°   intermediateAxisPlunge: 53°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [87]    Td: 5.0s [12]    Td*T50Ex: 2.6 [12]    To: 26.5s [86]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~80km
   North America / Pacific [subduction zone]: distance: ~360km
   Okhotsk / North America [subduction zone]: distance: ~360km
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 (80km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   2.6
   2.6
   2.6
Td*To:
     132.5
     132.5
     132.5
Mwp magnitude:
       6.6*
       6.6*
       6.6*
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.1781851954211.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):
Nodal Plane 1: strike: 155°   dip: 13°   rake: 29°
Nodal Plane 2: strike: 37°   dip: 84°   rake: 101°
Quality: azimuthalGap: -1°   stationPolarityCount: 129   misfitWeightCount: 15.7   misfit: 0.03   stationDistributionRatio: 0.57   meanDistP: 28.5   meanDistT: 25.8   qualityCode: B
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1781851954211.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 137°   dip: 8°   rake: 23°
Nodal Plane 2: strike: 24°   dip: 87°   rake: 97°
Quality: azimuthalGap: -1°   stationPolarityCount: 27   misfitWeightCount: 5.8   misfit: 0.00   stationDistributionRatio: 0.48   meanDistP: 42.8   meanDistT: 37.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1781851954211.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 214°   dip: 27°   rake: 104°
Nodal Plane 2: strike: 18°   dip: 64°   rake: 83°
Quality: azimuthalGap: 57°   stationPolarityCount: 129   misfit: 0.09   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 34.89   fracAcc30degPref: 0.58   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1781851954211.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1781851954211
Event info last updated: 2026.06.19-07:51:03 UTC
Event first association/location: 2026.06.19-06:59:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA