Azimuthal anisotropy of Lg attenuation in eastern Tibetan Plateau

doi:10.1029/2012JB009255

CORC > 北京大学 > 地球与空间科学学院

	Azimuthal anisotropy of Lg attenuation in eastern Tibetan Plateau
	Bao, Xueyang ; Sandvol, Eric ; Chen, Yongshun John ; Ni, James ; Hearn, Thomas ; Shen, Yang
刊名	journal of geophysical research solid earth
	2012
关键词	FREQUENCY LABORATORY MEASUREMENTS SHEAR MODE VISCOELASTICITY SEISMIC-FREQUENCY WAVE PROPAGATION CRUSTAL ROCKS UPPER-MANTLE INTRINSIC ATTENUATION DEPENDENT ATTENUATION TECTONIC EVOLUTION LATERAL VARIATIONS
DOI	10.1029/2012JB009255
英文摘要	The Q of seismic phase Lg is measured to approach the crustal Q(beta), which can be used to infer crustal rheology. A reverse two-station/event method is used to measure the interstation Q(Lg), which theoretically eliminates effects from the source and site response. Strong azimuthal anisotropy of 1/Q(Lg) in northern Tibet is observed, which approximately correlates with the seismic velocity anisotropy observed using both surface waves and teleseismic S waves. Both the intrinsic and scattering attenuation contribute the isotropic Q, whereas the anisotropic Q may be associated with the fractures and faults in the crust. Strong 1/Q(Lg) is observed in the northwestern Songpan-Ganzi fold belt, where the high-Q directions correspond with the orientations of major strike-slip faults. Intrinsic and scattering Q values are estimated for different tectonic terranes in eastern Tibetan Plateau. The intrinsic Q values are approximately 500 in the northern Tibetan Plateau, which suggests a hot (similar to 700 degrees C) crust, consistent with low seismic velocity measurements. Our result suggests that the crust of northwestern Songpan-Ganzi fold belt may be hotter than that of the Qiangtang terrane, which may be related to the strain heating along the major strike slip fault zones that dominate the northernmost Tibet.; Geochemistry & Geophysics; SCI(E); 5; ARTICLE; 117
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/229764]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Bao, Xueyang,Sandvol, Eric,Chen, Yongshun John,et al. Azimuthal anisotropy of Lg attenuation in eastern Tibetan Plateau[J]. journal of geophysical research solid earth,2012.
APA	Bao, Xueyang,Sandvol, Eric,Chen, Yongshun John,Ni, James,Hearn, Thomas,&Shen, Yang.(2012).Azimuthal anisotropy of Lg attenuation in eastern Tibetan Plateau.journal of geophysical research solid earth.
MLA	Bao, Xueyang,et al."Azimuthal anisotropy of Lg attenuation in eastern Tibetan Plateau".journal of geophysical research solid earth (2012).