Recent developments in SAC2000

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:611846

Goldstein, P; Dodge, D; Firpo, M

Before discussing recent developments in SAC2000, I will summarize what SAC2000 is/does. SAC2000 is the rebirth and evolution of Lawrence Livermore National Laboratory`s (LLNL`s) Seismic Analysis Code (SAC) developed during the 1980`s for a variety of geophysical applications. Primary funding for the development of SAC2000 has been through the LLNL as part of the Department of Energy`s (DOE`s) CTBT R&D program. The primary development goals for SAC2000 have been to meet the seismic signal processing and analysis needs of the DOE CTBT R&D teams and the rest of the CTBT R&D community. SAC2000`s strengths include its ability to process a diverse range of data types, its extensive, well documented signal processing capabilities (both on-line and on the web at http://www-ep.es.llnl.gov/tvp/sac.html), its macro language, and its ability to do both branch and interactive processing. Its extensive usage (over 200 institutions worldwide) had also made it much easier for researchers to develop collaborative research projects. SAC2000`s extensive signal processing capabilities include: data inspection, signal correction, and quality control, unary and binary data operations, travel-time analysis, spectral analysis including high-resolution spectral estimation, spectrograms and binary sonograms, and array and three-component analysis. Recent development in SAC2000 include: enhanced compatibility with the CSS3.0 database schema, complete compatibility with the widely used SEED data format instrument responses, map making capabilities via an interface to GMT, a new three component polarization and phase identification tool, an external interface that allows users to define their own commands, and an interface to MATLAB that allows the user to use MATLAB commands and scripts on SAC data from within SAC2000. We have also implemented a number of commands to enhance user efficiency and numerous improvements and enhancements to many individual SAC commands. Current development in SAC2000 are motivated by the need for easy and efficient access to, and processing and interpretation of large amounts of data. We are also driven by the need to communicate results from SAC2000 to our database and other programs. Based on these needs, we have begun developing a new data structure for SAC 2000. This new structure will completely compatible with the standard SAC format but will also allow us to access, modify, and output all the information in CSS3.0 based oracle databases or CSS3.0 flat files. Given the variety of data types that are currently possible in SAC2000 and other programs, and the likelihood that additional data types or parameters will be needed in the future, we designing SAC2000`s new format to be easily extendible and anticipate incorporation of significant extensions to the CSS3.0 schema.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 611846
• Report Number(s): UCRL-JC--127894; CONF-970967--; ON: DE98052116; BR: GC0402000
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
99 GENERAL AND MISCELLANEOUS
COMPUTER CODES
DATA PROCESSING
GEOPHYSICAL SURVEYS
PROGRAMMING
SEISMOLOGY
SIGNALS