Early-est:     Northern Sumatra, Indonesia    2026.02.12-13:14:19.84    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770902060369.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770902060369.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770902060369.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* [13]    Mwp: 4.3X [1]    Mwpd: - [0]
Region: Northern Sumatra, Indonesia
Origin Time: 2026.02.12-13:14:19.84 UTC
Hypocenter: lat: 4.16°  lon: 96.12°  [+/-14km]    depth: 59km  [+/-17km]
Location Quality: qualityCode:  C     stdErr: 1.5s   assocPhases: 76   usedPhases: 11
minDist: 1.4°   maxDist: 139.5°   AzGap: 129°   2ndAzGap: 165°   atten: -1.77 [+/-0.63]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 14km   azMaxHorUnc: 81°
68%ConfEllipsoid:   semiMajorAxisLength: 18km   majorAxisAzimuth: 72°   majorAxisPlunge: 47°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 273°   intermediateAxisPlunge: 42°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: 85%
T50Ex: 0.4X [2]    Td: -s [0]    Td*T50Ex: - [0]    To: 10.9Xs [2]
Closest plate boundaries:
   Sunda - Burma [continental rift boundary]: distance: ~70km
   Burma / Australia [subduction zone]: distance: ~260km
Subduction geometry:    Zone: Sumatra-Java: DEBUG: error: [Errno 2] No such file or directory: 'gmt'    Slab depth at epicenter: error: evaluating slab depth: -999.9
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (260km)
 no
 no
Prob underwater:
 85%
 85%
 85%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       59km
       59km
       59km
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.1770902060369.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 57°   dip: 29°   rake: 41°
Nodal Plane 2: strike: 290°   dip: 72°   rake: 112°
Quality: azimuthalGap: -1°   stationPolarityCount: 15   misfitWeightCount: 5.4   misfit: 0.08   stationDistributionRatio: 0.61   meanDistP: 39.5   meanDistT: 49.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770902060369.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.1770902060369.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 134°   dip: 48°   rake: 166°
Nodal Plane 2: strike: 233°   dip: 80°   rake: 42°
Quality: azimuthalGap: 101°   stationPolarityCount: 15   misfit: 0.17   stationDistributionRatio: 0.65   rmsAngDiffAccPref: 44.02   fracAcc30degPref: 0.37   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770902060369.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770902060369
Event info last updated: 2026.02.12-14:13:01 UTC
Event first association/location: 2026.02.12-13:20:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA