Earthquake Hazards Program


Downloadable software for earthquake research. USGS uses GitHub for all new software development, as well as open sourcing older software as time allows.
See how our applications work and collaborate with us at USGS GitHub.

Filter Total Items: 37
Date published: March 6, 2019

PQLX: A Software Tool to Evaluate Seismic Station Performance

PQLX is open-source software system for evaluating seismic station performance and data quality.

Date published: March 6, 2019


MacRay is a general purpose two-dimensional seismic ray-tracer for Macintosh.

Date published: March 6, 2019

HASH 1.2

HASH is a Fortran 77 code that computes double-couple earthquake focal mechanisms from P-wave first motion polarity observations, and optionally S/P amplitude ratios.

Date published: March 6, 2019


HypoDD is a Fortran computer program package for relocating earthquakes with the double-difference (DD) algorithm of Waldhauser and Ellsworth (2000).

Date published: March 6, 2019

HYPOINVERSE Earthquake Location

HYPOINVERSE2000 determines earthquake locations and magnitudes from seismic network data like first-arrival P and S arrival times, amplitudes and coda durations.

Date published: March 6, 2019

Coulomb 3

Coulomb is designed to investigate Coulomb stress changes on mapped faults and earthquake nodal planes, and is intended both for publication-directed research and for university teaching and instruction.

Date published: March 6, 2019

ComCat Wrapper Libraries

Bulk access via scripts, programs, and tools for obtaining specific products from ComCat (the earthquake catalog).

Date published: March 6, 2019

Direct Green's Function Synthetic Seismograms

These programs are an implementation of the Direct Green’s Function method described by Friederich and Dalkolmo (1995) and Dalkolmo (1993).

Date published: March 6, 2019

EIDS - Earthquake Information Distribution System

NOTE: EIDS has been replaced by PDL. EIDS is only needed as a component of PDL for advanced users who are running a PDL hub.

Date published: March 6, 2019


est_noise is a time-series analysis program that allows the user to fit various, standard functions to their data (rates, offsets, rate-changes, sinusoidals, exponentials, and/or user-defined functions) and simultaneously quantifies the amount of temporal correlation in the time-series data.

Date published: March 6, 2019


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

Date published: March 6, 2019


Cleanstrain+ is a program to process strainmeter data.