Early-est:     North of Halmahera, Indonesia    2026.02.13-15:55:15.75    q:B      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770998115182.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770998115182.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770998115182.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* [16]    Mwp: - [0]    Mwpd: 5.3Xinv [1]
Region: North of Halmahera, Indonesia
Origin Time: 2026.02.13-15:55:15.75 UTC
Hypocenter: lat: 4.30°  lon: 128.50°  [+/-15km]    depth: 55km  [+/-16km]
Location Quality: qualityCode:  B     stdErr: 1.6s   assocPhases: 55   usedPhases: 20
minDist: 3.7°   maxDist: 149.3°   AzGap: 122°   2ndAzGap: 146°   atten: -0.47 [+/-0.37]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 48°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 50°   majorAxisPlunge: 12°   semiIntermediateAxisLength: 16km   intermediateAxisAzimuth: 170°   intermediateAxisPlunge: 68°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [11]    Td: 0.9Xs [1]    Td*T50Ex: - [0]    To: 24.8s [10]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~10km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (10km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       55km
       55km
       55km
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.1770998115182.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 308°   dip: 58°   rake: -3°
Nodal Plane 2: strike: 40°   dip: 87°   rake: -148°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 7.3   misfit: 0.05   stationDistributionRatio: 0.57   meanDistP: 50.2   meanDistT: 47.9   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770998115182.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.1770998115182.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 216°   dip: 89°   rake: 132°
Nodal Plane 2: strike: 308°   dip: 42°   rake: 2°
Quality: azimuthalGap: 129°   stationPolarityCount: 19   misfit: 0.29   stationDistributionRatio: 0.75   rmsAngDiffAccPref: 36.29   fracAcc30degPref: 0.61   qualityCode: C
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770998115182.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770998115182
Event info last updated: 2026.02.13-16:54:02 UTC
Event first association/location: 2026.02.13-16:11:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA