Early-est:     Kuril Islands    2026.02.09-16:09:03.96    q:B      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770653349085.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770653349085.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770653349085.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: 4.8* [35]    Mwp: - [0]    Mwpd: - [0]
Region: Kuril Islands
Origin Time: 2026.02.09-16:09:03.96 UTC
Hypocenter: lat: 48.90°  lon: 153.55°  [+/-13km]    depth: 118km  [+/-15km]
Location Quality: qualityCode:  B     stdErr: 1.4s   assocPhases: 50   usedPhases: 38
minDist: 10.0°   maxDist: 84.3°   AzGap: 136°   2ndAzGap: 164°   atten: -0.88 [+/-0.22]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 13km   azMaxHorUnc: 123°
68%ConfEllipsoid:   semiMajorAxisLength: 17km   majorAxisAzimuth: 290°   majorAxisPlunge: 33°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 167°   intermediateAxisPlunge: 40°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.0 [11]    Td: 1.6Xs [1]    Td*T50Ex: - [0]    To: 2.4s [11]
Closest plate boundaries:
   Okhotsk / Pacific [subduction zone]: distance: ~210km
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 (210km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       118km
       118km
       118km
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.1770653349085.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 146°   dip: 44°   rake: 47°
Nodal Plane 2: strike: 19°   dip: 59°   rake: 124°
Quality: azimuthalGap: -1°   stationPolarityCount: 26   misfitWeightCount: 6.6   misfit: 0.11   stationDistributionRatio: 0.38   meanDistP: 47.6   meanDistT: 45.4   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770653349085.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.1770653349085.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):
Nodal Plane 1: strike: 231°   dip: 77°   rake: 180°
Nodal Plane 2: strike: 321°   dip: 90°   rake: 13°
Quality: azimuthalGap: 135°   stationPolarityCount: 27   misfit: 0.22   stationDistributionRatio: 0.71   rmsAngDiffAccPref: 25.30   fracAcc30degPref: 0.89   qualityCode: B
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770653349085.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770653349085
Event info last updated: 2026.02.09-17:08:00 UTC
Event first association/location: 2026.02.09-16:16:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA