Early-est:     Sikkim, India    2026.02.07-13:05:26.18    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770469526386.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770469526386.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770469526386.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* [22]    Mwp: - [0]    Mwpd: - [0]
Region: Sikkim, India
Origin Time: 2026.02.07-13:05:26.18 UTC
Hypocenter: lat: 27.33°  lon: 88.34°  [+/-16km]    depth: 5km  [+/-17km]
Location Quality: qualityCode:  C     stdErr: 1.3s   assocPhases: 43   usedPhases: 25
minDist: 19.0°   maxDist: 161.6°   AzGap: 101°   2ndAzGap: 147°   atten: -1.04 [+/-0.43]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 13km   maxHorUnc: 16km   azMaxHorUnc: 170°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 354°   majorAxisPlunge: 11°   semiIntermediateAxisLength: 18km   intermediateAxisAzimuth: 99°   intermediateAxisPlunge: 52°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [4]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.3s [4]
Closest plate boundaries:
   Eurasia - India [continental convergent boundary]: distance: ~50km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 YES (50km)
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
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.1770469526386.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 82°   dip: 14°   rake: -164°
Nodal Plane 2: strike: 337°   dip: 86°   rake: -76°
Quality: azimuthalGap: -1°   stationPolarityCount: 20   misfitWeightCount: 3.0   misfit: 0.03   stationDistributionRatio: 0.26   meanDistP: 54.1   meanDistT: 53.6   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770469526386.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.1770469526386.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 121°   dip: 89°   rake: 160°
Nodal Plane 2: strike: 211°   dip: 70°   rake: 1°
Quality: azimuthalGap: 146°   stationPolarityCount: 20   misfit: 0.50   stationDistributionRatio: 0.68   rmsAngDiffAccPref: 47.02   fracAcc30degPref: 0.46   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770469526386.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770469526386
Event info last updated: 2026.02.07-14:04:00 UTC
Event first association/location: 2026.02.07-13:32:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA