Software

FPFIT is a Fortran program that computes double-couple fault plane solutions from P-wave first motion data using a grid search method.

Cleanstrain+ is a program to process strainmeter data.

CLUSTER2000 recognizes clusters in space-time in an earthquake catalog.

3D Focal Mechanisms is a tool for viewing earthquake focal mechanism symbols three dimensionally.

Fortran code (VMS compatible) for 3-D velocity model determination and hypocentral location with local earthquake data.

MODFLOW 6 is presently the core MODFLOW version distributed by the USGS, but MODFLOW-2005 (the previous core version) is still actively maintained and supported. MODFLOW-2005 simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined.

SPARROW is a popular watershed modeling technique, distributed by the USGS, that estimates the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.

iRIC (International River Interface Cooperative) is a river flow and riverbed variation analysis software package which combines the functionality of MD_SWMS (Multi-Dimensional Surface-Water Modeling System), developed by the USGS, and RIC-Nays, developed by the Foundation of Hokkaido River Disaster Prevention Research Center.

USGS and the U.S. Environmental Protection Agency (EPA) have combined their SWSTAT and DFLOW software programs into a new tool for the low-flow anlaysis, the SWToolbox. As of May 2022, the SWToolbox has been superseded by the Hydrologic Toolbox.

The Groundwater Toolbox is a graphical and mapping interface for analysis of hydrologic data. It provides methods to estimate many of the components of the water budget for a hydrologic basin, including precipitation, streamflow, base flow, runoff, groundwater recharge and evapotranspiration. As of May 2022, the Groundwater Toolbox has been superseded by the Hydrologic Toolbox.

MODFLOW-GUI is a preprocessor and postprocessor graphical-user interface for preparing MODFLOW-96, MODFLOW-2000, MODFLOW-2005, MOC3D, MODPATH, and ZONEBDGT input data and viewing model output for use within Argus Open Numerical Environments (Argus ONE).

This tool is being provided free to the public in support of field and laboratory specialists who would like to create custom bar codes in order to better maintain their field and laboratory samples.