Early-est:     Sikkim, India    2026.02.05-19:39:42.32    q:C      mb:4.4*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770320373561.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770320373561.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770320373561.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: 4.4* [21]    Mwp: - [0]    Mwpd: - [0]
Region: Sikkim, India
Origin Time: 2026.02.05-19:39:42.32 UTC
Hypocenter: lat: 27.47°  lon: 88.14°  [+/-32km]    depth: 112km  [+/-66km]
Location Quality: qualityCode:  C     stdErr: 1.4s   assocPhases: 39   usedPhases: 21
minDist: 3.4°   maxDist: 141.6°   AzGap: 89°   2ndAzGap: 98°   atten: -0.57 [+/-0.33]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 25km   maxHorUnc: 32km   azMaxHorUnc: 32°
68%ConfEllipsoid:   semiMajorAxisLength: 68km   majorAxisAzimuth: 42°   majorAxisPlunge: 73°   semiIntermediateAxisLength: 36km   intermediateAxisAzimuth: 202°   intermediateAxisPlunge: 16°   semiMinorAxisLength: 31km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: <1%
T50Ex: 0.4 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 2.6s [6]
Closest plate boundaries:
   Eurasia - India [continental convergent boundary]: distance: ~70km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 no
 YES (70km)
 no
Prob underwater:
 <1%
 <1%
 <1%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       112km
       112km
       112km
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.1770320373561.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 268°   dip: 51°   rake: -39°
Nodal Plane 2: strike: 25°   dip: 61°   rake: -134°
Quality: azimuthalGap: -1°   stationPolarityCount: 21   misfitWeightCount: 7.9   misfit: 0.14   stationDistributionRatio: 0.43   meanDistP: 51.2   meanDistT: 52.5   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770320373561.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.1770320373561.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 3°   dip: 66°   rake: -128°
Nodal Plane 2: strike: 245°   dip: 44°   rake: -36°
Quality: azimuthalGap: 89°   stationPolarityCount: 21   misfit: 0.34   stationDistributionRatio: 0.70   rmsAngDiffAccPref: 29.86   fracAcc30degPref: 0.79   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770320373561.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770320373561
Event info last updated: 2026.02.05-20:38:00 UTC
Event first association/location: 2026.02.05-19:54:03 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA