Seismic noise subsoil in order to draw seismic microzonation maps showing the predicted ground response to earthquakes. Research on the origin of seismic noise indicates that the low frequency part of the spectrum (below 1 Hz) is due to natural causes, chiefly ocean waves. In particular the peak between 0.1 and 0.3 Hz is clearly associated with the interaction of water waves of nearly equal frequencies but opposite directions. At high frequency (above 1 Hz), seismic noise is mainly produced by human activities such as road traffic and industrial work; but there are also natural sources, like rivers. Around 1 Hz, wind
Seismic Productions Seismic Productions Seismic Productions is a Los Angeles based creative marketing company that creates trailers, television spots, and other marketing tools for the entertainment industry. Seismic Productions was founded in 1989 under the co-ownership of David Schneiderman and Kevin Sewelson. Schneiderman initially began his career at J. Walter Thompson advertising agency in New York before moving out west to work for Disney in 1986. In 1998, Erin Wyatt joined the company, and after a few years was working as an editor. In 2010, Wyatt was made a partner, and in 2011 Sewelson exited Seismic, leaving Schneiderman and Wyatt as the