Visualizing strain and the <i>R</i>_f-Φ method with an interactive computer program

作     者：Karabinos, Paul Warren, Chris 

作者机构：Williams Coll Dept Geosci Williamstown MA 01267 USA Williams Coll Off Informat Technol Williamstown MA 01267 USA 

出 版 物：《JOURNAL OF STRUCTURAL GEOLOGY》 (结构地质学杂志)

年 卷 期：2010年第32卷第1期

页      面：86-92页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

主　　题：Strain analysis R-f-Phi method Computer program Conglomerate 

摘      要：The R-f-Phi method is a powerful graphical approach for estimating finite strain of deformed elliptical objects, but one that students commonly find difficult to understand. We developed a program that allows users to explore visually how deforming a set of elliptical objects appears on R-f-Phi plots. A user creates or loads the ellipses and then deforms them by simple shear, pure shear, or rigid rotation. As the ratio of the long to short axis of the ellipses (R-f) and long-axis orientations (Phi) change in one window, the R-f-Phi plot continuously and instantaneously updates in another. Users can save snapshots of the deformed elliptical objects and the R-f-Phi plots to record graphical experiments. The program provides both R-f vs. Phi and polar ln(R-f) vs. 2(Phi) plots. The user can undeform ellipses quickly and easily, making it possible to inspect the original shapes and orientations of objects, and to evaluate the plausibility of the determined strain values. Users can export information about the pebbles shape and orientation to spread-sheets for rigorous statistical analysis. This program is written in Java and so can run on virtually any operating system. Both the source code and the application will be freely available for academic purposes. (C) 2009 Elsevier Ltd. All rights reserved.