Early-est:     Kuril Islands    2026.08.17-21:36:35.09    q:A      mb:5.2*    Mwp:-    Mwpd:-    Td*T50Ex:0.4     fmamp_polarity:./hypo.1787002590643.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1787002590643.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1787002590643.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: 5.2* [88]    Mwp: 5.2X [2]    Mwpd: 5.4Xinv [2]
Region: Kuril Islands
Origin Time: 2026.08.17-21:36:35.09 UTC
Hypocenter: lat: 46.23°  lon: 151.50°  [+/-13km]    depth: 68km  [+/-16km]
Location Quality: qualityCode:  A     stdErr: 1.2s   assocPhases: 131   usedPhases: 102
minDist: 7.3°   maxDist: 150.1°   AzGap: 60°   2ndAzGap: 71°   atten: -1.00 [+/-0.18]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 153°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 166°   majorAxisPlunge: 48°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 315°   intermediateAxisPlunge: 37°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [59]    Td: 1.0s [4]    Td*T50Ex: 0.4 [4]    To: 2.3s [59]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~130km
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:
   0.4
   0.4
   0.4
Td*To:
     2.3
     2.3
     2.3
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       68km
       68km
       68km
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.1787002590643.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 16°   dip: 57°   rake: 173°
Nodal Plane 2: strike: 110°   dip: 84°   rake: 33°
Quality: azimuthalGap: -1°   stationPolarityCount: 72   misfitWeightCount: 12.7   misfit: 0.17   stationDistributionRatio: 0.51   meanDistP: 34.7   meanDistT: 35.3   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1787002590643.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.1787002590643.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 244°   dip: 34°   rake: -11°
Nodal Plane 2: strike: 344°   dip: 84°   rake: -124°
Quality: azimuthalGap: 101°   stationPolarityCount: 72   misfit: 0.31   stationDistributionRatio: 0.74   rmsAngDiffAccPref: 35.94   fracAcc30degPref: 0.60   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1787002590643.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1787002590643
Event info last updated: 2026.08.17-22:35:01 UTC
Event first association/location: 2026.08.17-21:42:00 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA