Seismic Energy Generation and Partitioning into Various Regional Phases from Different Seismic Sources in the Middle East Region
Abstract
The project was focused on studying, experimentally, features of seismic energy generation and partitioning of P and S waves from different explosive seismic sources, at near-source and regional distances, in the time and spectral domain. An extensive database of Ground Truth single-fired explosions was created. The explosions selected contain a broad variety of design features (buried and surface sources, tamped and decoupled shots, large diameter 0.5-0.8m borehole and near-spherical cavity charges), charge weight (100-32500kg), depth (14 62m), scaled burial depth (1.0-3.9m/kg1/3), emplacement rocks (alluvium, basalts, marls) and geological settings. The highlight of this project was the source phenomenology experiments: Decoupling and Depth-of-Burial (DOB) explosion series at the phosphate quarry Oron, Negev. A special technology was used for creation of large cavities (up to 3.5 m) at different depths, to accommodate large near-spherical ANFO charges. Extensive observations in the near-source zone (100-800 m) and remotely (up to 350 km) demonstrated signal characteristics and energy generation features; decoupling factors were estimated. The design and configuration of the Oron DOB experiment were preferable in design to the previous Balapan DOB experiment (1997): media homogeneity, small aspect ratio (~1), full containment and small separation (~200 m) of the shots. The crossover point of spectral dominance at ~10 Hz for different depth shots, observed at ranges 0.2-230 km, was remarkably consistent with the Mueller/Murphy source model predictions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 20, 2007
- Accession Number
- ADA475170
Entities
People
- Rami Hofstetter
- Vladimir Pinsky
- Yefim Gitterman