Early-est:     Kuril Islands    2026.03.26-21:49:32.73    q:C      mb:4.6*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1774561771356.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1774561771356.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1774561771356.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: 4.6* [26]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.03.26-21:49:32.73 UTC
Hypocenter: lat: 47.44°  lon: 152.99°  [+/-29km]    depth: 115km  [+/-72km]
Location Quality: qualityCode:  C     stdErr: 1.1s   assocPhases: 46   usedPhases: 27
minDist: 8.8°   maxDist: 125.1°   AzGap: 125°   2ndAzGap: 138°   atten: -0.82 [+/-0.35]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 22km   maxHorUnc: 29km   azMaxHorUnc: 102°
68%ConfEllipsoid:   semiMajorAxisLength: 77km   majorAxisAzimuth: 259°   majorAxisPlunge: 70°   semiIntermediateAxisLength: 31km   intermediateAxisAzimuth: 140°   intermediateAxisPlunge: 10°   semiMinorAxisLength: 21km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [11]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.6s [9]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~140km
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 (140km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       115km
       115km
       115km
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.1774561771356.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 17°   dip: 18°   rake: -88°
Nodal Plane 2: strike: 195°   dip: 72°   rake: -91°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 5.4   misfit: 0.02   stationDistributionRatio: 0.53   meanDistP: 44.3   meanDistT: 49.0   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1774561771356.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.1774561771356.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 193°   dip: 67°   rake: -72°
Nodal Plane 2: strike: 332°   dip: 29°   rake: -127°
Quality: azimuthalGap: 138°   stationPolarityCount: 19   misfit: 0.19   stationDistributionRatio: 0.69   rmsAngDiffAccPref: 27.65   fracAcc30degPref: 0.82   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1774561771356.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1774561771356
Event info last updated: 2026.03.26-22:48:01 UTC
Event first association/location: 2026.03.26-22:30:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA