4. Core¶

Core programs for the EQcorrscan project. To be added: Lag calculation by cross-correlation to find optimum phase arrival picks for near-repeating earthquakes.

bright_lights contains a series of functions to detect events using the brightness-based beamforming method of Frank et. al (2014). This has been tested significantly, but has failed to detect events unambiguously in the central Southern Alps. As such development of these functions has ceased.

template_gen contains routines for cutting waveforms around picks for use as templates in match_filter. Included in this are wrappers to directly read in Seisan formattaed pick files and waveforms associated with the picks, and generate templates from these. There are also wrappers for quakeML events and catalogs, and seishub databases.

match_filter contains the core routines for earthquake detection by cross-correlation. This is optimized for large-scale, multi-paralleled detection, with large numbers of templates. Because we are unsure of your architecture we have not written functions for the top level of possible parallel computing, which would be to compute detections for multiple days in parallel in a High-Performance Computing, cluster environment. If you want to know more about doing this please contact the authors. We use a cluster running SLURM for job scheduling and handle multiple days using the batch job submission capability which distributes daily detections across multiple nodes. This allows us to detect earthquakes through > 6 years of multi-channel data using > 600 templates in less than 36 hours.