Enceladus exhibits persistent cryovolcanic plume activity driven by tidal forcing and internal energy dissipation. Previous studies have primarily focused on short-timescale variability, including orbital tidal modulation, plume brightness fluctuations, and local jet dynamics. However, the possibility of longer-timescale organized variability remains insufficiently explored. In this exploratory note, we construct a composite plume activity index (X(t)) from normalized proxies

In order to quantitatively describe the seismicity within certain area and period, a new mathematical quantity S, as a quantitative descript

Tonga eruption is likely to be the precursor before the volcanic eruption in the large-scale stress field of plate tectonics outside Qinghai