Studies of Regional Phase Propagation in Eurasia
Abstract
We investigated various issues related to the propagation of seismic waves in Eurasia during the period 16 Aug 1990 - 15 Dec 1992. This final report covers the research accomplished under the 2 tasks that have not been reported previously in the first annual report PL-TR-92-2042. Section I describes briefly how we derived a spherically symmetric velocity structure for the Garm region in Central Asia with travel-time residuals of regional phases recorded at the IRIS station GAR and and the CDSN station WMQ. In Section II, we conducted a tomographic inversion to determine the regional L sub g Q structure in the Iranian Plateau. Although the whole of Iran can be regarded as a region of very low Q, applying a simple averaged attenuation coefficient (Q) for the whole plateau would be inappropriate for the L sub g magnitude determination. The regional variation of the anelastic attenuation parameter is significant enough that it must be taken into account in calibrating each monitoring station for a reliable magnitude scale in monitoring possible clandestine tests from a vast area. Section III of this report gives a perspective overview of the whole project.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1992
- Accession Number
- ADA262801
Entities
People
- Christopher S. Lynnes
- Rong-song Jih
Organizations
- Teledyne Technologies