Early-est:     Western Nei Mongol, China    2026.10.13-08:15:05.52    q:C      mb:4.6    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1791879305519.mech.fmamp_polarity.thumb.jpg     hash:./hypo.1791879305519.mech.hash.thumb.jpg     fmamp_amp_aref:./hypo.1791879305519.mech.fmamp_amp_aref.thumb.jpg     fmamp_amp_mwp:./hypo.1791879305519.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: Western Nei Mongol, China
Origin Time: 2026.10.13-08:15:05.52 UTC
Hypocenter: lat: 38.78°  lon: 105.35°  [+/-14km]    depth: 1km  [+/-16km]
Location Quality: qualityCode:  C     stdErr: 2.0s   assocPhases: 34   usedPhases: 13
minDist: 9.2°   maxDist: 163.2°   AzGap: 132°   2ndAzGap: 139°   atten: -1.11 [+/-0.08]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 14km   azMaxHorUnc: 134°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 330°   majorAxisPlunge: 26°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 66°   intermediateAxisPlunge: 11°   semiMinorAxisLength: 16km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.7 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.0Xs [1]
Closest plate boundaries:
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:
       1km
       1km
       1km
Slab depth at epicenter:
       n/a
       -
       -
./hypo.1791879305519.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 161°   dip: 14°   rake: -15°
Nodal Plane 2: strike: 265°   dip: 86°   rake: -104°
Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 4.2   misfit: 0.08   stationDistributionRatio: 0.61   meanDistP: 39.7   meanDistT: 29.9   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1791879305519.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 191°   dip: 17°   rake: 30°
Nodal Plane 2: strike: 72°   dip: 81°   rake: 105°
Quality: azimuthalGap: 132°   stationPolarityCount: 14   misfit: 0.22   stationDistributionRatio: 0.60   rmsAngDiffAccPref: 33.99   fracAcc30degPref: 0.57   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1791879305519.mech.hash.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_AREF):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1791879305519.mech.fmamp_amp_aref.mechanism.jpg
First-motion Focal Mechanism (FMAMP_AMP_MWP):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: nan°
Nodal Plane 2: strike: nan°   dip: nan°   rake: nan°
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.1791879305519.mech.fmamp_amp_mwp.mechanism.jpg

Event ID: smi:KOERI/ee/event/1791879305519
Event info last updated: 2026.10.13-09:15:39 UTC
Event first association/location: 2026.10.13-08:52:40 UTC
Software: Early-est 1.2.0 (2016.06.27)
Agency: KOERI