Early-est:     Kuril Islands    2026.02.11-18:00:25.78    q:B      mb:5.1*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770832816530.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770832816530.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770832816530.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: 5.1* [48]    Mwp: 4.9X [1]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.02.11-18:00:25.78 UTC
Hypocenter: lat: 44.15°  lon: 147.88°  [+/-33km]    depth: 30km  [+/-45km]
Location Quality: qualityCode:  B     stdErr: 1.5s   assocPhases: 83   usedPhases: 60
minDist: 4.1°   maxDist: 134.1°   AzGap: 123°   2ndAzGap: 125°   atten: -1.43 [+/-0.20]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 28km   maxHorUnc: 33km   azMaxHorUnc: 128°
68%ConfEllipsoid:   semiMajorAxisLength: 49km   majorAxisAzimuth: 308°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 37km   intermediateAxisAzimuth: 126°   intermediateAxisPlunge: 35°   semiMinorAxisLength: 35km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [42]    Td: 1.3Xs [2]    Td*T50Ex: - [0]    To: 3.5s [42]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~110km
   Pacific \ Okhotsk [subduction zone]: distance: ~460km
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 (110km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       30km
       30km
       30km
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.1770832816530.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 137°   dip: 62°   rake: -179°
Nodal Plane 2: strike: 47°   dip: 89°   rake: -28°
Quality: azimuthalGap: -1°   stationPolarityCount: 50   misfitWeightCount: 7.7   misfit: 0.13   stationDistributionRatio: 0.33   meanDistP: 48.9   meanDistT: 53.1   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770832816530.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.1770832816530.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 127°   dip: 85°   rake: 172°
Nodal Plane 2: strike: 218°   dip: 82°   rake: 5°
Quality: azimuthalGap: 123°   stationPolarityCount: 50   misfit: 0.29   stationDistributionRatio: 0.67   rmsAngDiffAccPref: 17.29   fracAcc30degPref: 1.00   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770832816530.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770832816530
Event info last updated: 2026.02.11-18:59:01 UTC
Event first association/location: 2026.02.11-18:06:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA