Skip to main content

Table 2 Summary of the signal detection and determination capabilities of vessel-GNSS-A and daily-GNSS in 2021

From: Crustal deformation detection capability of the GNSS-A seafloor geodetic observation array (SGO-A), provided by Japan Coast Guard

  Ability GNSS-A Daily-GNSS
  Observation frequency (f) 4–6 times/year 365 times/year
  Standard deviation (σ) 1.5 cm 0.5 cm
Case Verification GNSS-A Daily-GNSS
Trend only 95%CL of determined trend 6.0 cm/year (1-year obs.)
0.5–0.8 cm/year (4-year obs.)
0.2 cm/year (1-year obs.)
0.03 cm/year (4-year obs.)
95%CL of detectable difference of trends 1.0–1.5 cm/year (4-year obs.) 0.35 cm/year (1-year obs.)
0.05 cm/year (4-year obs.)
Event only Effect size (γ = 0.8 and α = 0.05) 3.0 cm (± 1-year obs.) 0.1 cm (± 1-year obs.)
  (For keeping a false positive below 0.05, threshold of -Δc-AIC should be set about 10.)
Trend and event (6-year obs.) False negative 0.7–0.2 (for a signal of 4.5–6.0 cm (3σ–4σ)) 0 (even for a signal of 0.5 cm (1σ))
95%CL of determined trend 1.8 cm/year (1.2σ/year) 0.1 cm/year (0.18σ/year)
Standard deviation of determined event size 1.5 cm (1σ) 0.08 cm (0.15σ)
90th percentile of determined occurrence time  ± 0.5 year (for a signal of 6.0 cm (4σ))  ± 0.1 year (for a signal of 2.0 cm (4σ))