Note: As of April 21st 2026, this repository will be archived. Development has been transferred to the USGS Gitlab instance https://code.usgs.gov/ghsc/esi/esi-core

Repository for compiled code used by ESI projects, namely C code used in the USGS Shakemap and Groundmotion-Processing programs.

As of September 15th, this project is functional for the gmprocess portion of compiled code. Shakemap functionality will soon follow.

The compiled code here is used in gmprocess both in metrics calculations and waveform processing.

Computation of waveform metrics utilizes the oscillators module, while waveform processing routines use the auto_fchp for corner frequency determination, as well as the konno-omachi and smoothing modules to perform spectral smoothing

Provides the Shakemap project with necessary C libraries for Shakemap production and contouring