Early-est:     North of Halmahera, Indonesia    2026.02.13-15:09:26.18    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1770995365893.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1770995365893.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1770995365893.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: 4.8* [17]    Mwp: - [0]    Mwpd: - [0]
Region: North of Halmahera, Indonesia
Origin Time: 2026.02.13-15:09:26.18 UTC
Hypocenter: lat: 4.49°  lon: 128.58°  [+/-15km]    depth: 9km  [+/-14km]
Location Quality: qualityCode:  C     stdErr: 3.2s   assocPhases: 43   usedPhases: 25
minDist: 3.9°   maxDist: 159.8°   AzGap: 92°   2ndAzGap: 116°   atten: -0.53 [+/-0.40]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 12km   maxHorUnc: 15km   azMaxHorUnc: 150°
68%ConfEllipsoid:   semiMajorAxisLength: 19km   majorAxisAzimuth: 331°   majorAxisPlunge: 14°   semiIntermediateAxisLength: 15km   intermediateAxisAzimuth: 64°   intermediateAxisPlunge: 12°   semiMinorAxisLength: 13km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.5 [13]    Td: -s [0]    Td*T50Ex: - [0]    To: 20.7s [12]
Closest plate boundaries:
   Philippine Sea \ Sunda [subduction zone]: distance: ~30km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (30km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       9km
       9km
       9km
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.1770995365893.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 31°   dip: 38°   rake: -81°
Nodal Plane 2: strike: 200°   dip: 53°   rake: -97°
Quality: azimuthalGap: -1°   stationPolarityCount: 19   misfitWeightCount: 5.5   misfit: 0.05   stationDistributionRatio: 0.27   meanDistP: 48.8   meanDistT: 51.7   qualityCode: D
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1770995365893.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.1770995365893.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (Warning: VERY UNRELIABLE SOLUTION, qualityCode=D)
Nodal Plane 1: strike: 351°   dip: 85°   rake: -172°
Nodal Plane 2: strike: 260°   dip: 82°   rake: -5°
Quality: azimuthalGap: 115°   stationPolarityCount: 19   misfit: 0.32   stationDistributionRatio: 0.72   rmsAngDiffAccPref: 51.06   fracAcc30degPref: 0.38   qualityCode: D
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1770995365893.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1770995365893
Event info last updated: 2026.02.13-16:08:02 UTC
Event first association/location: 2026.02.13-15:46:01 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA