P/S Amplitude and Moment Tensor Discrimination of Explosions and Earthquakes at Distances Less Than 100 km
Abstract
Discrimination of earthquakes and explosions using seismic recordings at local distances of less than about 100 km was tested with a dense array near Mt. St. Helens and promising approaches were further tested with datasets from three other localities with single-fired borehole explosions and earthquakes. Potential controls on local distance P/S ratios were investigated, including: distance, magnitude, source depth, number of seismographs, frequency range, and site effects. The need to maximize source discrimination constraints with limited seismographs motivated testing of potentially complementary approaches. Joint use of P/S amplitude ratios and ML-Mc magnitude estimates provides improved classification for the Mt. St. Helens dataset and three additional datasets. These improvements over performance of either individual method were found without locally specific correction factors and using a simple linear threshold for binary classification, thus there are opportunities to build upon the joint method for local distance explosion discrimination.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 2021
- Accession Number
- AD1157848
Entities
People
- Brandon Schmandt
- Ruijia Wong