Accession Number : ADA257852


Title :   Regional Wave Attenuation Eurasia


Descriptive Note : Annual technical rept. no. 2, 27 Sep 1991-30 Sep 1992


Corporate Author : TORONTO UNIV (ONTARIO) DEPT OF PHYSICS


Personal Author(s) : Chun, Kin-Yip ; Zhu, Tianfei ; Shih, Xiao Rung


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257852.pdf


Report Date : Oct 1992


Pagination or Media Count : 30


Abstract : Presented in the Scientific Report Number 2 are our research efforts in the first year of our two-year project in regional wave studies in Eurasia. Based on the reversed two-station method (RTSM), our research has led to development in methodology, i.e., formulation of the source pair/receiver pair (SPRP) method and the extended RTSM, suitable for attenuation study using data from sparsely-located stations. These methods are more flexible in making use of the regional data from Eurasia. Compared to the RTSM, results from either method lead to measurements of the frequency-dependent anelastic attenuation in an area instead of inter-station (event) paths. Application of the SPRP method to the CDSN/IRIS data from regional and far-regional distances has shown that Lg attenuation at low frequencies (0.1-1.0 Hz) exhibits greater stability and consistency than its higher-frequency counterpart. Application of the extended RTSM to the local and regional recordings from Beijing Telemetered Network (BTN) has shown that the area under BTN is characterized by relatively high Lg attenuation, compared to the non-Tibetan portion of the Eurasian continent. Lg, ATTENUATION, EURASIA, IRIS, CDSN, BTN, TIME-DOMAIN ANALYSIS, REGIONALIZATION


Descriptors :   *SEISMIC WAVES , *ATTENUATION , *EURASIA , FREQUENCY , STATIONS , MEASUREMENT , METHODOLOGY , LOW FREQUENCIES , STABILITY , FORMULATIONS , PATHS , CONSISTENCY , RECEIVERS


Subject Categories : Seismology
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE