Regional Studies with Broadband Data
Abstract
The general objective of this research supported by this grant has been a better definition of the explosion and earthquake source processes. Love and Rayleigh wave group velocities for the Tibetan Plateau have been used to infer crustal velocities for that region. Results include a crustal thickness of 74 km, a prominent low velocity zone for shear waves in the depth range 24-34 km, and a uniformly high shear wave velocity of 3.88 km/sec in the lower 40 km of the crust. The low velocity zone can best be interpreted in terms of a zone of elevated pore pressure, while the high velocity in the lower crust and upper mantle imply the presence of usually low temperatures in the depth range of 50- 100 km. Such results are consistent with the hypothesis of large-scale underthrusting of the Indian continent. In recent years the research has moved toward the detailed study of source mechanisms of earthquakes and explosions with broadband data. Keywords: Nuclear explosion; Seismic data; Surface waves; Source mechanisms.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1985
- Accession Number
- ADA161497
Entities
People
- L. R. Johnson
- Thomas V. McEvilly
Organizations
- University of California, Berkeley