Spring AGU abstract

...because these abstract deadlines always manage to sneak up on me:

Inversion of the teleseismic P coda for lithospheric structure: Examples from Ontario and California

A.W. Frederiksen and J. Zhang, University of Manitoba
J. Revenaugh, University of Minnesota

The coda of the teleseismic P wave has become one of the most powerful tools for unravelling fine-scale receiver-side structure, using both single stations and sparse or dense arrays of seismometers. Determining structural information from the coda is an inverse problem that may be treated using either linear or nonlinear methods, depending on what ad hoc assumptions are made about the nature of the coda waves and the structures that generate them. We will review some of the principal methods used in coda imaging and inversion, and examine two methods in greater detail: a non-linear search algorithm applied to single-station data in the presence of anisotropy and dip, and a linearized tomographic inversion of scattered-wave energy in the coda. Examples of applying these methods to detect thinly laminated mantle anisotropy beneath southern Ontario and features correlated with seismicity in California will be given.

It's kind of vague, because I'm not sure what's going to make it into the talk at this stage -- but, since Partha talked me into co-chairing a session with him, I might as well take the opportunity to try to publicize my scattering-tomography method a bit better. The chairing part of the equation will be a first for me, as well -- better not nod off during any talks...

Comments

[John Vidale]

Interesting, Justin had some neat results on scattering, its anisotropy, and even its time-dependence in California, but it was hard to independently check. Maybe drop a link to result you find when they are available.

[Andrew Frederiksen]

The California work I did was actually based on some of the same data as Justin's previous work, since it was a test case for a different method -- it's a project I wrapped up a while back but which took forever to get published. In any case, it's in the December 2004 issue of GJI. If my student has had time to do some work on southern Ontario using the same method, I'll throw some images from there in; otherwise I'll rehash the California stuff, since it doesn't seem to have received as much notice as I would have liked.