NASA Home Page Goddard Space Flight Center Home Page
NASA Logo - Goddard Space Flight Center   + Visit NASA.gov
a directory of Earth science data and services Global Change Master Directory Web site
header 2 bullet Links bullet FAQ bullet Contact Us bullet Site Map
Home Data Sets Data Services Learn about GCMD_legacy's portal collaborations. Add new dataset or dataservice records to GCMD_legacy What's New Participate Calendar About GCMD_legacy
 
Record Search Query: ServiceParameters>DATA ANALYSIS AND VISUALIZATION>STATISTICAL APPLICATIONS

VISCO1D - A Program Package to Calculate Quasi-Static Deformation on a Layered Spherical Earth
Entry ID: USGS_VISCO1D
[ Get Service ]
[ Update this Record ]


Summary
Abstract: VISCO1D is a program package designed to describe the response of a spherically stratified elastic-viscoelastic medium to the stresses generated by an earthquake occurring in one of the elastic layers. The response is described in a spherical earth geometry in terms of a spherical harmonic expansion of spheroidal and toroidal motion components, each component representing one "mode" of relaxation with its own characteristic decay time and spatial deformation pattern. It is highly flexible and allows the determination of time-dependent postseismic deformation fields (three components of displacement and six independent components of strain) at any depth level. It handles shear dislocations on a specified fault plane, or extension across a specified fault plane. Use of the program package consists of four main parts:

1. Specification of a stratified Earth model (elastic moduli and viscosity of every layer).

2. Identification of spheroidal and toroidal motion modes on this Earth model, consisting of a set of characteristic decay times for each spherical harmonic degree.

3. Determination of the corresponding displacement-stress vectors for each of these modes.

4. Determination of postseismic deformation at specified times, observation points (lat,lon,depth), and source geometry and slip.

There are two sets of programs, one designed for non-gravitational viscoelastic response and the other for gravitational viscoelastic response. The former runs considerably faster.

[Summary provided by the USGS.]

Related URL
Link: GET SERVICE > GET SOFTWARE PACKAGE
Description: Download the VISCO1D program.

Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: Access documentation for the VISCO1D program.
Service Citation
Originators: Fred Pollitz
Title: VISCO1D - A Program Package to Calculate Quasi-Static Deformation on a Layered Spherical Earth
Provider: U.S. Geological Survey
URL: http://earthquake.usgs.gov/research/software/#VISCO1D
ISO Topic Category
GEOSCIENTIFIC INFORMATION
Service Provider
Earthquake Hazards Program, Geological Division, U.S. Geological Survey, U.S. Department of the Interior

Service Provider Personnel
Name: EARTHQUAKE HAZARDS PROGRAM OFFICE
Contact Address:
12201 Sunrise Valley Drive, MS 905
City: Reston
Province or State: VA
Postal Code: 20192
Country: USA
Distribution Media
Distribution_Media: Online
Distribution_Size: 2.1 MB
Fees: No fees
Personnel
FRED POLLITZ
Role: TECHNICAL CONTACT
Phone: 650-329-4821
Fax: 650-329-5163
Email: fpollitz at usgs.gov
Contact Address:
U.S. Geological Survey
345 Middlefield Road MS 977
City: Menlo Park
Province or State: CA
Postal Code: 94025-3591
Country: USA

TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2012-02-07
SERF Last Revision Date: 2012-02-07
[ Update this Record ]
USA dot gov - The U.S. Government's Official Web Portal NASA
Webmaster:  Monica Holland
Responsible NASA Official:  Lola Olsen
Last Updated:  October 2014