Multi-Array Detection, Association and Location of Infrasound and Seismo-Acoustic Events in Utah
Abstract
The two main objectives of this work are to (1) develop an automated method for processing seismic and infrasound data from multiple seismo-acoustic arrays, and (2) to apply the method to a regional network of arrays for validation. The project involves development of automated techniques for detecting, associating, and locating infrasound signals at single and multiple arrays and then combining the processed results with similar automated procedures for seismic signals. This approach differs from most existing systems that typically depend on late association or data fusion after events are formed. Regional infrasound and seismo-acoustic events are automatically detected, associated and located using seismo-acoustic stations in Utah. We utilize the InfraMonitor toolbox, recently developed at Los Alamos National Laboratory (LANL), in collaboration with Southern Methodist University (SMU). The toolbox comprises an adaptive F-detector - which accounts for real ambient noise, and a robust signal association/event location algorithm. Seismic signals, obtained using a statistically based short-term average/long-term average (STA/LTA) detector, are associated with infrasound events obtained by InfraMonitor. A thorough ground-truth survey using satellite observations and independent data provides the basis for event identification. An analyst reviews automatic results in order to make a preliminary assessment of the number of false associations. We report on the numbers, distributions and sources of reviewed infrasound and seismo-acoustic events detected by Utah seismo-acoustic stations. Case studies of selected events provide examples of the infrasonic and seismo-acoustic records from regional events.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2008
- Accession Number
- ADA487599
Entities
People
- Brian Stump
- Chris Hayward
- Gurpreet Singh
- Il-young Che
- Relu Burlacu
- Stephen J. Arrowsmith
Organizations
- Los Alamos National Laboratory