Dynamic measurements of Coroglio coastal tuffs cliff, Naples, Italy

The Coroglio tuff cliff, having an approximative surface of 35*10^3 m^2 (140m high and 250m wide), represents a unique geophysical field laboratory. The Coroglio coastal cliff, located in Naples, prevalently faces the Pozzuoli Bay (Tyrrhenian Sea) with a SW orientation and it is subject to very variable weather condition. The cliff surface is characterized by the presence of several fractured welded tuff and rock blocks. In order to monitor the dynamic behaviour of the site, a tri-axial velocimeter has been installed on the Coroglio tuff cliff since 2015. It was located on the cliff free surface at a height of 90.0 meters. The scope is to record vibrations propagating in the medium and to analyse a possible correlation with natural events and/or anthropic activities occurring in the area. This would provide, in principle, the possibility of detecting a typical frequency response for the cliff. The seismic sensor has been set to record minimum and maximum values, recorded every 60 seconds on each component. Here we present the maximum absolute velocity values recorded in a 3-years period (July 2015 - July 2018), resulting in 4320 values each day