Early-est:     Near Islands, Aleutian Islands    2025.01.31-23:19:32.87    q:B      mb:4.7    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:     hash:     fmamp_amp_aref:     fmamp_amp_mwp:

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

Earthquake Details: Magnitude: mb: 4.7 [30]    Mwp: - [0]    Mwpd: - [0] Region: Near Islands, Aleutian Islands Origin Time: 2025.01.31-23:19:32.87 UTC Hypocenter: lat: 52.63°  lon: 173.46°  [+/-15km]    depth: 10km  [+/-14km] Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 59   usedPhases: 33 minDist: 0.4°   maxDist: 131.5°   AzGap: 116°   2ndAzGap: 121°   atten: -0.71 [+/-0.28] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 6° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 185°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 81°   intermediateAxisPlunge: 52°   semiMinorAxisLength: 12km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [20]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.7s [16] Closest plate boundaries:    North America / Pacific [subduction zone]: distance: ~110km    Okhotsk / Pacific [subduction zone]: distance: ~680km    Okhotsk / North America [subduction zone]: distance: ~680km Subduction geometry:    Zone: Alaska-Aleutians    Slab depth at epicenter: 60km 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:        10km        10km        10km Slab depth at epicenter:        60km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 68°   dip: 23°   rake: -68° Nodal Plane 2: strike: 224°   dip: 69°   rake: -99° Quality: azimuthalGap: -1°   stationPolarityCount: 32   misfitWeightCount: 7.1   misfit: 0.15   stationDistributionRatio: 0.56   meanDistP: 31.7   meanDistT: 38.9   qualityCode: D Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 55°   dip: 19°   rake: 9° Nodal Plane 2: strike: 317°   dip: 87°   rake: 108° Quality: azimuthalGap: 85°   stationPolarityCount: 32   misfit: 0.20   stationDistributionRatio: 0.59   rmsAngDiffAccPref: 42.62   fracAcc30degPref: 0.43   qualityCode: D Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
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
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

Event ID: smi:KOERI/ee/event/1738365575138
Event info last updated: 2025.02.01-00:20:01 UTC
Event first association/location: 2025.01.31-23:30:30 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI