The Correlation Class

This toolbox provides an environment for analyzing waveforms with a suite of related cross-correlation techniques based on a common data object. Features include:

•     Optimized cross-correlation routines capable of handling thousands of traces at a time
  

•     Max correlation and lag time determinations for all event pairs (no "master" events)
  

•     Dendrogram-type heirarchical clustering of event families
  

•     Plotting tools for all included data types
  

•     Suite of basic manipulation tools: filter, crop, subset, stack, normalize, automatic gain control, etc.
  

•     Functions for waveform interferometry
  

•     Optimized differential arrival times following Vandecar and Crosson, 1990
  

•     Built on the waveform toolbox
  

The correlation toolbox was written by Mike West and tested in Matlab release 2007b. Most functionality should exist with versions 2006 and later. A few features of the correlation toolbox require the statistics toolbox (linkage, cluster and dedrogram plotting). Because data handling is carried out using the waveform toolbox, data can be imported from Antelope databases, Winston databases, SAC and Seisan files. There is also an import routine for the CORAL format. Since it uses the waveform toolbox, any homegrown format can be imported with limited coding.

Further details:

• See the correlation toolbox cookbook for a demo of utilities.
• Presentation "Tools and techniques in seismic waveform correlation", March 28, 2008 (5 Mb .pdf)