Table 2 Tidal constituents in the study area and radon signals.
From: Radon degassing triggered by tidal loading before an earthquake
Tide | Radon signal | Remarks | ||||
|---|---|---|---|---|---|---|
Constituent | Symbol | Period (h) | Amplitude rank | 1984–1988 | 1990–1994 | |
Lunar | O1 | 25.819 | 3 | None | None | |
Solar | S1 | 24.000 | > 4 | Exist | Exist | Meteorological factors |
Luni-solar | K1 | 23.934 | 2 | None | Exist | |
Principal lunar | M2 | 12.421 | 1 | None | None | |
Principal solar | S2 | 12.000 | 4 | Exist | Exist | Meteorological factors |
