Early-est:     Qinghai, China    2026.09.27-16:43:11.95    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:0.8     fmamp_polarity:./hypo.1790527392051.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790527392051.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790527392051.mech.hash.thumb.jpg

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

Earthquake Details:
Magnitude: mb: 4.7* [18]    Mwp: 5.0X [2]    Mwpd: 5.3Xinv [2]
Region: Qinghai, China
Origin Time: 2026.09.27-16:43:11.95 UTC
Hypocenter: lat: 35.37°  lon: 99.61°  [+/-16km]    depth: 5km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.7s   assocPhases: 51   usedPhases: 21
minDist: 9.7°   maxDist: 84.4°   AzGap: 65°   2ndAzGap: 97°   atten: -0.68 [+/-0.49]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 16km   azMaxHorUnc: 84°
68%ConfEllipsoid:   semiMajorAxisLength: 21km   majorAxisAzimuth: 82°   majorAxisPlunge: 9°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 340°   intermediateAxisPlunge: 51°   semiMinorAxisLength: 14km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.5 [12]    Td: 1.6s [6]    Td*T50Ex: 0.8 [6]    To: 5.4s [11]
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:
   0.8
   0.8
   0.8
Td*To:
     8.6
     8.6
     8.6
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       5km
       5km
       5km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1790527392051.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 112°   dip: 28°   rake: 124°
Nodal Plane 2: strike: 255°   dip: 67°   rake: 74°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 6.0   misfit: 0.06   stationDistributionRatio: 0.29   meanDistP: 46.4   meanDistT: 45.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790527392051.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (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/_polarity_waveform
./hypo.1790527392051.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 106°   dip: 36°   rake: 130°
Nodal Plane 2: strike: 240°   dip: 63°   rake: 65°
Quality: azimuthalGap: 64°   stationPolarityCount: 17   misfit: 0.32   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 36.54   fracAcc30degPref: 0.52   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790527392051.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790527392051
Event info last updated: 2026.09.27-17:42:00 UTC
Event first association/location: 2026.09.27-16:55:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA