Early-est:     Northern Sumatra, Indonesia    2025.12.10-07:43:03.68    q:B      mb:4.8    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: 4.8 [33]    Mwp: - [0]    Mwpd: - [0] Region: Northern Sumatra, Indonesia Origin Time: 2025.12.10-07:43:03.68 UTC Hypocenter: lat: 5.35°  lon: 94.51°  [+/-15km]    depth: 73km  [+/-18km] Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 66   usedPhases: 37 minDist: 5.1°   maxDist: 146.6°   AzGap: 110°   2ndAzGap: 139°   atten: -0.98 [+/-0.22] Location Uncertainty: 68%ConfEllipse:   minHorUnc: 11km   maxHorUnc: 15km   azMaxHorUnc: 74° 68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 77°   majorAxisPlunge: 41°   semiIntermediateAxisLength: 14km   intermediateAxisAzimuth: 218°   intermediateAxisPlunge: 41°   semiMinorAxisLength: 13km Tsunamigeneic Assesment: Discriminants: Prob Underwater: >99% T50Ex: 0.4 [19]    Td: 0.5Xs [2]    Td*T50Ex: - [0]    To: 1.8s [13] Closest plate boundaries:    Sunda - Burma [continental transform fault]: distance: ~110km    Burma / India [subduction zone]: distance: ~210km    India \ Burma [subduction zone]: distance: ~300km Subduction geometry:    Zone: Sumatra-Java    Slab depth at epicenter: 41km 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:        73km        73km        73km Slab depth at epicenter:        41km        -        -

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D) Nodal Plane 1: strike: 50°   dip: 37°   rake: -88° Nodal Plane 2: strike: 228°   dip: 53°   rake: -91° Quality: azimuthalGap: -1°   stationPolarityCount: 33   misfitWeightCount: 6.2   misfit: 0.10   stationDistributionRatio: 0.42   meanDistP: 39.6   meanDistT: 36.7   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: 6°   dip: 42°   rake: -132° Nodal Plane 2: strike: 236°   dip: 60°   rake: -59° Quality: azimuthalGap: 109°   stationPolarityCount: 33   misfit: 0.26   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 33.96   fracAcc30degPref: 0.65   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/1765352582642
Event info last updated: 2025.12.10-08:43:46 UTC
Event first association/location: 2025.12.10-07:52:38 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI