Earthquake Hazards
Software
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.
PQLX: A Software Tool to Evaluate Seismic Station Performance
PQLX is open-source software system for evaluating seismic station performance and data quality.
MacRay
MacRay is a general purpose two-dimensional seismic ray-tracer for Macintosh.
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.
HypoDD
HypoDD is a Fortran computer program package for relocating earthquakes with the double-difference (DD) algorithm of Waldhauser and Ellsworth (2000).
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.
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.
ComCat Wrapper Libraries
Bulk access via scripts, programs, and tools for obtaining specific products from ComCat (the earthquake catalog).
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).
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NOTE: EIDS has been replaced by PDL.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.
Est_noise
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.
FPFIT, FPPLOT and FPPAGE
FPFIT is a Fortran program that computes double-couple fault plane solutions from P-wave first motion data using a grid search method.
Cleanstrain+
Cleanstrain+ is a program to process strainmeter data.