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Shear-wave attenuation and velocity ...

Jemberie, Alemayehu Lakew.

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Shear-wave attenuation and velocity studies in southeastern Asia.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shear-wave attenuation and velocity studies in southeastern Asia./
作者:	Jemberie, Alemayehu Lakew.
面頁冊數:	218 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1757.
Contained By:	Dissertation Abstracts International63-04B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3051807
ISBN:	0493665366

Shear-wave attenuation and velocity studies in southeastern Asia.
Jemberie, Alemayehu Lakew.

Shear-wave attenuation and velocity studies in southeastern Asia. - 218 p.

Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1757.

Thesis (Ph.D.)--Saint Louis University, 2002.

Models of shear-wave Q (Qmu) have been obtained for southeastern Asia using two methods. The first method inverts attenuation coefficients of the fundamental Rayleigh mode obtained using a standard two-station technique. The second method matches theoretical amplitude spectra for the fundamental and higher-mode Rayleigh waves computed for previously obtained velocity and assumed Qmu models, and earthquakes with known source depths and focal mechanisms, to observed spectra. The latter method provides much better regional coverage than the first and allows us to map lateral variations of Qmu at various levels in the crust and uppermost mantle.

ISBN: 0493665366Subjects--Topical Terms:

535228
Geophysics.

Shear-wave attenuation and velocity studies in southeastern Asia.
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500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1757.
500 $a Adviser: Brian Mitchell.
502 $a Thesis (Ph.D.)--Saint Louis University, 2002.
520 $a Models of shear-wave Q (Qmu) have been obtained for southeastern Asia using two methods. The first method inverts attenuation coefficients of the fundamental Rayleigh mode obtained using a standard two-station technique. The second method matches theoretical amplitude spectra for the fundamental and higher-mode Rayleigh waves computed for previously obtained velocity and assumed Qmu models, and earthquakes with known source depths and focal mechanisms, to observed spectra. The latter method provides much better regional coverage than the first and allows us to map lateral variations of Qmu at various levels in the crust and uppermost mantle.
520 $a For the single-station, multi-mode method, I assumed an Earth model consisting of three layers, layer 1 being 10 km, layer 2 being 20 km, and layer 3 being 30 km in thickness. Qmu in layer 1 achieves lowest values (about 40) in the southern part of the Tibetan Plateau and in the Tarim basin and is highest (about 250) in southeastern China. The Qmu map of layer 2 indicates that the highest Qmu values (about 150) he in the central part of China and in parts of the Sino-Korean platform. The lowest Q mu value (about 50) occurs in Tibet and the Pamir thrust system. Layer 2 exhibits an overall increase in Qmu going from south to north. For layer 3 the resolution of crustal variations in Qmu, is poorer than layers 1 and 2. Available results, however, indicate that Qmu, is highest (about 180) under southern Mongolia and the Tarim basin, somewhat lower (100) beneath the southern portion of the Baikal Rift, and lowest (80) under the Pamir thrust system.
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