Early-est:     Mariana Islands    2025.11.09-22:53:39.79    q:A      mb:5.2    Mwp:-    Mwpd:-    Td*T50Ex:0.8     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 [96]    Mwp: - [0]    Mwpd: - [0] Region: Mariana Islands Origin Time: 2025.11.09-22:53:39.79 UTC Hypocenter: lat: 13.62°  lon: 144.92°  [+/-14km]    depth: 107km  [+/-17km] Location Quality: qualityCode:  A     stdErr: 1.1s   assocPhases: 190   usedPhases: 131 minDist: 0.1°   maxDist: 172.4°   AzGap: 25°   2ndAzGap: 40°   atten: -1.53 [+/-0.14] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 14km   azMaxHorUnc: 90° 68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 93°   majorAxisPlunge: 55°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 268°   intermediateAxisPlunge: 34°   semiMinorAxisLength: 14km Tsunamigeneic Assesment: Discriminants: Prob Underwater: 76% T50Ex: 0.4 [63]    Td: 2.1s [6]    Td*T50Ex: 0.8 [6]    To: 1.7s [60] Closest plate boundaries:    Philippine Sea - Mariana [oceanic spreading ridge]: distance: ~110km    Mariana / Pacific [subduction zone]: distance: ~140km    Philippine Sea / Pacific [subduction zone]: distance: ~300km Subduction geometry:    Zone: Izu-Bonin    Slab depth at epicenter: 66km Decision table (TEST!): Event type: Subduction Zone Other Thrust/Normal Strike-slip Compatible close plate boundary?:  YES (140km)  no  no Prob underwater:  76%  76%  76% Td*T50Ex:    0.8    0.8    0.8 Td*To:      3.6      3.6      3.6 Mwp magnitude:        -        -        - Hypocenter depth:        107km        107km        107km Slab depth at epicenter:        66km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C) Nodal Plane 1: strike: 310°   dip: 14°   rake: 138° Nodal Plane 2: strike: 81°   dip: 81°   rake: 80° Quality: azimuthalGap: -1°   stationPolarityCount: 102   misfitWeightCount: 20.6   misfit: 0.21   stationDistributionRatio: 0.39   meanDistP: 36.4   meanDistT: 27.3   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: 332°   dip: 67°   rake: -136° Nodal Plane 2: strike: 222°   dip: 51°   rake: -30° Quality: azimuthalGap: 24°   stationPolarityCount: 102   misfit: 0.29   stationDistributionRatio: 0.64   rmsAngDiffAccPref: 29.50   fracAcc30degPref: 0.73   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/1762728813829
Event info last updated: 2025.11.09-23:53:51 UTC
Event first association/location: 2025.11.09-22:59:32 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI