Regional Seismic Studies in Central Asia
Abstract
This report describes two related research efforts. Section A discusses strike-slip faulting within the Zagros Mountains of Iran. Mechanisms for six earthquakes along the Kazerun line show right-lateral strike-slip motion within this compressional environment, indicating the line is the surface expression of a buried strike-slip fault. Slip vectors in these earthquakes are different from neighboring reverse-faulting earthquakes suggesting that the Kazerun line accommodates some of the shortening between Arabia and central Iran by an elongation of the Zagros parallel to the strike. Section B presents a new velocity model for the continental upper mantle beneath central Siberia based on observations of the 1982 'Rift' DSS profile. The major features of the model are: (1) a sharp increase in velocity gradient between 210 and 235 km depth; (2) a broad high-gradient zone from 400 to 435 km depth; and (3) a narrow high- gradient zone between 655 and 659 km depth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 17, 1994
- Accession Number
- ADA276729
Entities
People
- Keith Priestley
Organizations
- University of Nevada, Reno