\title{Iterated Correlations}
\def\figdir{./Fig}
\author{Sjoerd~de Ridder}
\righthead{Kinematics in C}
\lefthead{De Ridder}

\begin{abstract}
Correlating ambient seismic noise.
\end{abstract}

\section{Introduction}
\cite{wapenaar2006a} has shown that correlations of seismic background noise is cool \cite[]{wapenaar2004a,wapenaar2006c}. See also Figure \ref{fig:correlation} and appendix \ref{app:greens}.

\plot{correlation}{width=12cm}{Another very helpfull figure.}

\section{Conclusions}
Many years left to Graduate.

\section{Acknowledgements}
The BBJ triumvirate and my mommy, for helpfull discussions and suggestions.

\section{Appendix}
\section{Wave equation and Green's function}\label{app:greens}
We study the wave equation in an acoustic, linear, isotropic, time-invariant, sourceless, constant-density medium. The familiar wave equation for pressure $P = P(\mathbf{x},t)$ is
\begin{equation}
\partial_i^2 P - c^{-2}\partial_t^2 P = 0 \label{eq:pwave},
\end{equation}
where Einstein's summation convention is applied to lower-case subscripts; for 2D they are summed over 1 and 2. Temporal and spatial derivatives are denoted $\partial_t$ and $\partial_i$ respectively, where the subscripts denote time and spatial directions respectively. Under the constant-density assumption, the characteristic wave velocity $c = c(\mathbf{x})$ fully determines the medium.

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