Early-est:     Sichuan, China    2025.12.11-17:18:35.46    q:B      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1765473516282.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1765473516282.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1765473516282.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1765473516282.mech.fmamp_amp_mwp.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.6 [11]    Mwp: - [0]    Mwpd: - [0]
Region: Sichuan, China
Origin Time: 2025.12.11-17:18:35.46 UTC
Hypocenter: lat: 28.05°  lon: 104.01°  [+/-15km]    depth: 10km  [+/-14km]
Location Quality: qualityCode:  B     stdErr: 1.1s   assocPhases: 50   usedPhases: 13
minDist: 5.3°   maxDist: 82.2°   AzGap: 86°   2ndAzGap: 120°   atten: -1.41 [+/-0.49]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 15km   azMaxHorUnc: 45°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 227°   majorAxisPlunge: 16°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 318°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.5 [9]    Td: 0.5Xs [1]    Td*T50Ex: - [0]    To: 3.3s [6]
Closest plate boundaries:
   Eurasia - Yangtze [continental rift boundary]: distance: ~90km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 no
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       10km
       10km
       10km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1765473516282.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 89°   dip: 20°   rake: 26°
Nodal Plane 2: strike: 334°   dip: 81°   rake: 108°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 3.6   misfit: 0.06   stationDistributionRatio: 0.24   meanDistP: 35.4   meanDistT: 35.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1765473516282.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 335°   dip: 78°   rake: 89°
Nodal Plane 2: strike: 158°   dip: 12°   rake: 93°
Quality: azimuthalGap: 119°   stationPolarityCount: 15   misfit: 0.24   stationDistributionRatio: 0.61   rmsAngDiffAccPref: 36.28   fracAcc30degPref: 0.47   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1765473516282.mech.hash.mechanism.jpg
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
./hypo.1765473516282.mech.fmamp_amp_aref.mechanism.jpg
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
./hypo.1765473516282.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1765473516282
Event info last updated: 2025.12.11-18:18:45 UTC
Event first association/location: 2025.12.11-17:51:02 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI