Early-est:     Kuril Islands    2026.10.12-15:44:34.84    q:B      mb:5.0    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791819874789.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791819874789.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791819874789.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791819874789.mech.fmamp_amp_mwp.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 5.0 [55]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.10.12-15:44:34.84 UTC
Hypocenter: lat: 48.21°  lon: 155.16°  [+/-13km]    depth: 20km  [+/-13km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 90   usedPhases: 70
minDist: 8.4°   maxDist: 149.6°   AzGap: 95°   2ndAzGap: 129°   atten: -0.83 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 13km   azMaxHorUnc: 100°
68%ConfEllipsoid:   semiMajorAxisLength: 16km   majorAxisAzimuth: 278°   majorAxisPlunge: 4°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 187°   intermediateAxisPlunge: 6°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.4 [19]    Td: 1.1Xs [2]    Td*T50Ex: - [0]    To: 1.8s [13]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~70km
Subduction geometry:    Zone: Kamchatka/Kurils/Japan    Slab depth at epicenter: 20km
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (70km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       20km
       20km
       20km
Slab depth at epicenter:
       20km
       -
       -
./hypo.1791819874789.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 88°   dip: 41°   rake: -89°
Nodal Plane 2: strike: 267°   dip: 49°   rake: -91°
Quality: azimuthalGap: -1°   stationPolarityCount: 69   misfitWeightCount: 10.3   misfit: 0.18   stationDistributionRatio: 0.36   meanDistP: 45.3   meanDistT: 38.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791819874789.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 181°   dip: 85°   rake: 161°
Nodal Plane 2: strike: 273°   dip: 71°   rake: 5°
Quality: azimuthalGap: 84°   stationPolarityCount: 69   misfit: 0.42   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 24.54   fracAcc30degPref: 0.93   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791819874789.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_aref
./hypo.1791819874789.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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/_amp_mwp
./hypo.1791819874789.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791819874789
Event info last updated: 2026.10.12-16:44:51 UTC
Event first association/location: 2026.10.12-15:54:24 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI