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Surface-wave attenuation and its lat...

Sholy, Beshara Ibrahim.

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Surface-wave attenuation and its lateral variation in the crust of the southwestern United States.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Surface-wave attenuation and its lateral variation in the crust of the southwestern United States./
作者:	Sholy, Beshara Ibrahim.
面頁冊數:	146 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-07, Section: B, page: 3202.
Contained By:	Dissertation Abstracts International63-07B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3059682
ISBN:	0493750495

Surface-wave attenuation and its lateral variation in the crust of the southwestern United States.
Sholy, Beshara Ibrahim.

Surface-wave attenuation and its lateral variation in the crust of the southwestern United States. - 146 p.

Source: Dissertation Abstracts International, Volume: 63-07, Section: B, page: 3202.

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

Shear wave Q (Qmu) models are obtained for a broad region of the southwestern United States. A single station method that compares observed amplitude spectra of fundamental and higher-mode Rayleigh waves to theoretically predicted spectra for assumed Qmu models is used to determine Q mu as a function of depth. Velocity structure and initial Qmu models are assumed for event-station pairs in which the events have known source depths and focal mechanisms. 164 event-station paths obtained from 33 earthquakes and 32 stations provide good path coverage for the region. The coverage is adequate to map lateral variations of Qmu at various depths in the continental crust of the southwestern United States. Two Qmu earth models of the crust are presented. Both models have three horizontal crustal layers of varying thickness overlying a uniform half-space. The analyses reveal that the Qmu variations correlate with changes in surface tectonics of the region. Average Qmu values for the upper crust for the whole region are found to vary between 55 and 75. These low values are expected for the seismically active and highly fractured crust of California and for the rifted Basin and Range province. Higher average Qmu values (103--116) are found at mid-crustal and lower-crustal depths. Qmu variations patterns are compared to geological and geophysical parameters of the southwestern United States, and found to partially correlate with heat flow patterns of the region.

ISBN: 0493750495Subjects--Topical Terms:

535228
Geophysics.

Surface-wave attenuation and its lateral variation in the crust of the southwestern United States.
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520 $a Shear wave Q (Qmu) models are obtained for a broad region of the southwestern United States. A single station method that compares observed amplitude spectra of fundamental and higher-mode Rayleigh waves to theoretically predicted spectra for assumed Qmu models is used to determine Q mu as a function of depth. Velocity structure and initial Qmu models are assumed for event-station pairs in which the events have known source depths and focal mechanisms. 164 event-station paths obtained from 33 earthquakes and 32 stations provide good path coverage for the region. The coverage is adequate to map lateral variations of Qmu at various depths in the continental crust of the southwestern United States. Two Qmu earth models of the crust are presented. Both models have three horizontal crustal layers of varying thickness overlying a uniform half-space. The analyses reveal that the Qmu variations correlate with changes in surface tectonics of the region. Average Qmu values for the upper crust for the whole region are found to vary between 55 and 75. These low values are expected for the seismically active and highly fractured crust of California and for the rifted Basin and Range province. Higher average Qmu values (103--116) are found at mid-crustal and lower-crustal depths. Qmu variations patterns are compared to geological and geophysical parameters of the southwestern United States, and found to partially correlate with heat flow patterns of the region.
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