Early-est:     Mariana Islands    2026.10.10-03:58:19.17    q:A      mb:5.2    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: 5.2 [73]    Mwp: 5.3X [1]    Mwpd: 5.3Xinv [1] Region: Mariana Islands Origin Time: 2026.10.10-03:58:19.17 UTC Hypocenter: lat: 13.76°  lon: 145.22°  [+/-14km]    depth: 112km  [+/-17km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 124   usedPhases: 98 minDist: 0.4°   maxDist: 172.3°   AzGap: 43°   2ndAzGap: 56°   atten: -1.27 [+/-0.14] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 14km   azMaxHorUnc: 129° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 320°   majorAxisPlunge: 60°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 110°   intermediateAxisPlunge: 26°   semiMinorAxisLength: 16km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.0 [46]    Td: 1.2Xs [2]    Td*T50Ex: - [0]    To: 1.3s [43] Closest plate boundaries:    Mariana / Pacific [subduction zone]: distance: ~130km    Philippine Sea - Mariana [oceanic spreading ridge]: distance: ~140km    Philippine Sea / Pacific [subduction zone]: distance: ~330km Subduction geometry:    Zone: Izu-Bonin    Slab depth at epicenter: 65km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (130km)  no  no Prob underwater:  >99%  >99%  >99% Td*T50Ex:    -    -    - Td*To:      -      -      - Mwp magnitude:        -        -        - Hypocenter depth:        112km        112km        112km Slab depth at epicenter:        65km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 180°   dip: 71°   rake: 17° Nodal Plane 2: strike: 84°   dip: 74°   rake: 160° Quality: azimuthalGap: -1°   stationPolarityCount: 89   misfitWeightCount: 16.6   misfit: 0.18   stationDistributionRatio: 0.40   meanDistP: 44.8   meanDistT: 33.8   qualityCode: D 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: 75°   dip: 45°   rake: 166° Nodal Plane 2: strike: 175°   dip: 80°   rake: 46° Quality: azimuthalGap: 43°   stationPolarityCount: 89   misfit: 0.41   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 29.01   fracAcc30degPref: 0.75   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/1791604696719
Event info last updated: 2026.10.10-04:58:45 UTC
Event first association/location: 2026.10.10-04:03:25 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI