Middle East, North Africa and Western Eurasia Seismic Research Database
The National Nuclear Security Administration (NNSA) Ground-Based Nuclear Explosion Monitoring Research and Engineering (GNEM R&E) Program at Lawrence Livermore National Laboratory (LLNL) has made significant progress populating a comprehensive Seismic Research Database (SRDB) used for deriving seismic calibration parameters for the Middle East, North Africa and Western Eurasia (ME/NA/WE) regions. In addition to an overview of select individual information products, we present an overview of our visualization, integration, validation, and organizational processes. Development of these processes and the LLNL SRDB was necessitated by both the very large amount of data and information involved (over 15 terabytes) and the varied data and research result formats utilized. The LLNL SRDB allows for the collection of raw and contextual seismic data used in research, provides an interface for researchers to access data, provides a framework to store research results and integrate datasets, and supports assembly, integration and dissemination of datasets to the NNSA Knowledge Base (KB). The LLNL SRDB is a flexible and extensible framework consisting of a relational database (RDB), Geographical Information System (GIS), and associated product/data visualization and data management tools. This framework is designed to accommodate large volumes of data in diverse formats from many sources (both in-house-derived research and integrated contractor products), in addition to maintaining detailed quality control and metadata. In order to efficiently organize information within the LLNL SRDB, it was necessary to automate procedures needed to create and update database tables, but a large effort is still required by technicians and scientists to load special datasets, review results of automated processing and resolve quality issues. The LLNL SRDB currently has 3 million reconciled event origins and arrivals from several global, regional and local seismic bulletins and 30 million waveforms from 570,000 seismic events. We also use the LLNL SRDB for integration and have developed procedures, algorithms, and tools, organized as a tool set called KBITS, which permits datasets to be merged and dataset quality control to be maintained. KBITS can be used to integrate waveform and bulletin data into unified datasets. This suite of tools is now being used by LLNL for content development and by Sandia National Laboratory to assist in creation of the KB. It enables inclusion of data from contractors, universities, and NNSA collaborators for content development and to provide coherent, reconciled and integrated results to the NNSA KB. The SRDB integration framework also supports and facilitates NNSA ROA and BAA projects. The LLNL SRDB provides the basis for synergistic development of all LLNL GNEM R&E Program research. It is not only a coherent framework in which to store and organize very large volumes of collected seismic waveforms, associated event parameter information, and spatial contextual data, but also provides an efficient data processing/research environment for deriving a wide range of information products required to support the ME/NA/WE regionalization program. Products assembled, integrated and validated using the LLNL SRDB are grouped into five main categories: reference and contextual information, detection data, calibration and groundtruth data, event location products and event identification products. Using the LLNL SRDB, we are combining travel-time observations, event characterization studies, and regional tectonic models to assemble a library of ground-truth information and phenomenology (e.g. travel-time and amplitude) correction surfaces. Corrections and parameters distilled from the LLNL SRDB provide essential contributions to the NNSA KB for the ME/NA/WE region and facilitate calibration of seismic monitoring stations, thereby improving capabilities for underground nuclear explosion monitoring.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15004123
- Report Number(s):
- UCRL-JC-148363-REV-1; TRN: US201015%%357
- Resource Relation:
- Conference: Seismic Research Review, Tucson, AZ, Sep 23 - Sep 25, 2003
- Country of Publication:
- United States
- Language:
- English
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