Software

Models, Codes and Catalogs used to produce the National Seismic Hazard Maps.

OpenSHA is an effort to develop object-oriented, web- & GUI-enabled, open-source, and freely available code for conducting Seismic Hazard Analyses (SHA).

PPHASEPICKER is a powerful tool for automatically picking P-phase onsets with high precision without requiring detection interval or threshold settings.

The Product Distribution Layer (PDL) is a USGS platform for receiving earthquake data over the Internet in near-real time.

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

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

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

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

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

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