ENSO, terrestrial rotation, volcanos and seismicity

The study of el Nino-Southern Oscillation (ENSO) is a paradigm for the necessary dialogue of all the geosciences. Ocean-atmosphere interaction is readily accepted as the central actor of the inter annual oscillation of the climate system. The influence of ENSO in earth's rotation is not widely acknowledged outside very specialized audiences, nevertheless empirical evidence in support is strong, and theory to explain it is very well founded. ENSO influence on seismicity is even more polemic. Observations are not clear and theory is still under development. Some authors postulate that ENSO is a response to the effect of stratospheric volcanic aerosol. This works is a review of the literature related to this issues and some computations related to possible ENSO effect on seismicity are reported. The main conclusion is that issues remain open both with respect to the relation of ENSO with seismicity and with respect to the relation of volcanic aerosols and ENSO