physics and mathematics of earthqaukes, landslides and volcanoes?

Can someone please direct me to web resources describing these processes in
some detail?  I am especially interested in sites where commonly used
mathematical models of these processes are described and critiqued.  I am a
theoretical ecologist by training, and my primary interest here is the
effects these processes have on landscape (so when I am done, I should be
able to begin with a flat landscape, apply a model, and obtain a reasonably
realistic landscape), and the habitats that will develop on them, but I have
a secondary interest related to my study of nonlinear systems dynamics (and
consequently I'm interested mostly in models
consisting of systems of ODEs, PDEs, or iterated functions, as well as
statistical properties of variables representing time between events and
magnitude of events).  Yes, I am well aware of, and have used, the purely
mathematical procedures to generate fractal landscapes, but I am looking for
something that can be readily related to the physics of these three
phenomena.  I want to be able to look at any particular term in a
mathematical model and understand how it relates to the physics, and to run
simulations wherein I can related changes in, e.g. forest, communities to
various aspects of these phenomema such as time between successive events
and magnitude of events (and of course this means I will be using monte
carlo simulation extensively).

I don't want to get into a debate as to which model is best, but rather
study the available suite of generally recognised models along with commonly
recognised limitations (much as with some studies I may use the logistic
population model, despite its may limitations, just because everyone knows
it and its limitations and time and effort can be focussed on the property
of interest to me rather than being wasted arguing about the merits of the
model itself).

This is part of a long term study, so I can't promise anything in the way of
results any time soon.

Thanks in advance for any assistance you can provide in this matter.

Cheers,

Ted