Early-est:     Mariana Islands    2025.06.06-21:37:27.91    q:A      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:0.2     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: 4.6 [63]    Mwp: 4.9X [2]    Mwpd: - [0] Region: Mariana Islands Origin Time: 2025.06.06-21:37:27.91 UTC Hypocenter: lat: 18.54°  lon: 145.22°  [+/-15km]    depth: 471km  [+/-18km] Location Quality: qualityCode:  A     stdErr: 1.4s   assocPhases: 93   usedPhases: 71 minDist: 9.0°   maxDist: 148.1°   AzGap: 43°   2ndAzGap: 67°   atten: -1.57 [+/-0.13] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 93° 68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 269°   majorAxisPlunge: 30°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 108°   intermediateAxisPlunge: 58°   semiMinorAxisLength: 15km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.2 [34]    Td: 0.8s [5]    Td*T50Ex: 0.2 [5]    To: 1.2s [26] Closest plate boundaries:    Philippine Sea - Mariana [oceanic spreading ridge]: distance: ~70km    Mariana / Pacific [subduction zone]: distance: ~260km    Philippine Sea / Pacific [subduction zone]: distance: ~670km Subduction geometry:    Zone: Izu-Bonin    Slab depth at epicenter: 516km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (260km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    0.2    0.2    0.2 Td*To:      1.0      1.0      1.0 Mwp magnitude:        -        -        - Hypocenter depth:        471km        471km        471km Slab depth at epicenter:        516km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 91°   dip: 27°   rake: 100° Nodal Plane 2: strike: 260°   dip: 64°   rake: 85° Quality: azimuthalGap: -1°   stationPolarityCount: 60   misfitWeightCount: 18.3   misfit: 0.25   stationDistributionRatio: 0.54   meanDistP: 33.1   meanDistT: 20.5   qualityCode: C Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 209°   dip: 52°   rake: 157° Nodal Plane 2: strike: 313°   dip: 72°   rake: 41° Quality: azimuthalGap: 43°   stationPolarityCount: 60   misfit: 0.40   stationDistributionRatio: 0.76   rmsAngDiffAccPref: 36.68   fracAcc30degPref: 0.62   qualityCode: C 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: 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/_amp_aref
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (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/_amp_mwp

Event ID: smi:KOERI/ee/event/1749245839086
Event info last updated: 2025.06.06-22:37:51 UTC
Event first association/location: 2025.06.06-21:47:11 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI