Early-est:     North of Halmahera, Indonesia    2026.02.13-17:39:16.40    q:C      mb:4.7*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1771004356395.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1771004356395.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1771004356395.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* [14]    Mwp: - [0]    Mwpd: - [0]
Region: North of Halmahera, Indonesia
Origin Time: 2026.02.13-17:39:16.40 UTC
Hypocenter: lat: 4.27°  lon: 128.35°  [+/-26km]    depth: 71km  [+/-51km]
Location Quality: qualityCode:  C     stdErr: 0.9s   assocPhases: 35   usedPhases: 17
minDist: 3.6°   maxDist: 153.4°   AzGap: 104°   2ndAzGap: 109°   atten: -0.67 [+/-0.47]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 19km   maxHorUnc: 26km   azMaxHorUnc: 67°
68%ConfEllipsoid:   semiMajorAxisLength: 52km   majorAxisAzimuth: 224°   majorAxisPlunge: 77°   semiIntermediateAxisLength: 31km   intermediateAxisAzimuth: 72°   intermediateAxisPlunge: 11°   semiMinorAxisLength: 23km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [11]    Td: 1.1Xs [1]    Td*T50Ex: - [0]    To: 19.0s [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:
       71km
       71km
       71km
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.1771004356395.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 111°   dip: 20°   rake: 141°
Nodal Plane 2: strike: 238°   dip: 78°   rake: 74°
Quality: azimuthalGap: -1°   stationPolarityCount: 14   misfitWeightCount: 4.4   misfit: 0.02   stationDistributionRatio: 0.42   meanDistP: 41.4   meanDistT: 45.6   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1771004356395.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.1771004356395.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 300°   dip: 45°   rake: 51°
Nodal Plane 2: strike: 170°   dip: 57°   rake: 122°
Quality: azimuthalGap: 125°   stationPolarityCount: 14   misfit: 0.28   stationDistributionRatio: 0.81   rmsAngDiffAccPref: 39.74   fracAcc30degPref: 0.49   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1771004356395.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1771004356395
Event info last updated: 2026.02.13-18:38:00 UTC
Event first association/location: 2026.02.13-18:18:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA