Body Wave Ray Tracing Caustics & Wavefront Healing + 2-D Scalar Waves with Jun
This binder contains two collections of Dahlen's: "Body Wave Ray Tracing Caustics & Wavefront Healing" and "2-D Scalar Waves with Jun". The former comprises the majority of the binder, and is exclusively made up of handwritten notes from Dahlen which he put together in November of 1992. The last section or so deals with the latter collection, and includes a fax sent by coworkers from Schlumberger Cambridge Research Limited by some coworkers. Later on they published a paper entitled Diffraction elements upon finite-frequency travel times: a simple 2-D example in early June of 1998. The notes themselves are contained within an emerald green loose leaf binder.

The first part of the notes deal with Body Wave Ray Tracing, which is the method for calculating the path of waves or particles through a system that has different properties, and therefore different wave speeds. A great example of this is, surprisingly, the Earth! As they cross different boundaries, the wave can diffract, reflect, and behave in different ways. Dahlen sought to constrain this motion to better understand it. Wavefront healing is the idea of the diffraction energy from waves entering the "shadow zone" and obscuring its effects. The last part of the collection deals with Dahlen reviewing work done by Jun Tong and other colleagues.

This collection can be found at: Guyot Hall, Princeton, NJ, 08544. Back to Main Page 		Cover
Pages Sheet Numbers
On reading Berry & Upstill (1980) 1–4 1–4
Three-dimensional raytracing 5–14 1–10
Three-dimensional raytracing II 15–33 1–12, 1–6
Three-dimensional ray-tracing III 34–52 1–7, 2–4, 1–8
One More Time – Yuk! 53–69 1–9, 1–2, 1–6
2–d Scalar Waves 70–75 1–4
Two-D 76–87 1–12
Two–Dimensional Scalar Wave Propagation 88–111 1–23
Picture near a caustic 112–113 1–2
Maslov theory – one more time 114–119 1–6
Homogenous medium: the time-domain Green function satisfies 120–129 1–10
Maslov Theory in 2–D Again 130–136 1–6
[Fax of theoretical parts of a report sent by Henk (Marquering)] 137–151 N/A
Jun's paper – after a long layoff 10/29/87 152–155 1–4