Strong <i>Lg</i> wave attenuation in the Northern and Eastern Tibetan Plateau measured by a two‐station/two‐event stacking method

Fan, Guangwei; Lay, Thorne

doi:10.1029/2002gl016211

Cited by 34 publications

(22 citation statements)

References 12 publications

(18 reference statements)

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“…Figure 9c shows that the geometry of ideal RTE closely resembles that of RTS except that the positions of stations and events are switched. This case was not presented until the study of Fan and Lay (2003). Similar to (11), we can write…”

Section: Two and Reverse Two Station Q Tomographymentioning

confidence: 92%

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Collaborative Research: High-Resolution Seismic Velocity and Attenuation Models of Western China

Sandvol¹,

Ni²,

Hearn³

et al. 2014

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Section: Two and Reverse Two Station Q Tomographymentioning

confidence: 92%

“…Lg attenuation studies of northern Tibet indicate low Lg attenuation (Q less than 100 at 1 Hz). The reason for such low Lg attenuation is not completely understood, but it seems related to high temperature and a partially melted crust of northern Tibet [Hacker et al, 2000;Fan and Lay, 2003].…”

Section: Tectonic Settingmentioning

confidence: 99%

Collaborative Research: High-Resolution Seismic Velocity and Attenuation Models of Western China

Sandvol¹,

Ni²,

Hearn³

et al. 2014

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“…The SPRP method is implemented in the frequency domain by Fan and Lay (2003b) and in the time domain by Shih et al (1994) and Chung et al (2005) where they find clusters in small regions that are very different from the overall 1-D Q model. The SPRP method in the time domain is much better suited for a large homogeneous region, where several interstation regions can be grouped together.…”

Section: Discussionmentioning

confidence: 99%

Regional Attenuation in Northern California: A Comparison of Five 1D Q Methods

Ford

Dreger

Mayeda

et al. 2008

Bulletin of the Seismological Society of America

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The determination of regional attenuation Q -1 can depend upon the analysis method employed. The discrepancies between methods are due to differing parameterizations (e.g., geometrical spreading rates), employed datasets (e.g., choice of path lengths and sources), and the methodologies themselves (e.g., measurement in the frequency or time domain). Here we apply five different attenuation methodologies to a Northern California dataset. The methods are: (1) coda normalization (CN), (2) two-station (TS), (3) reverse two-station (RTS), (4) sourcepair/receiver-pair (SPRP), and (5) coda-source normalization (CS). The methods are used to measure Q of the regional phase, Lg (Q Lg ), and its power-law dependence on frequency of the form Q 0 f η with controlled parameterization in the well-studied region of Northern California using a high-quality dataset from the Berkeley Digital Seismic Network. We investigate the difference in power-law Q calculated among the methods by focusing on the San Francisco Bay Area, where knowledge of attenuation is an important part of seismic hazard mitigation. This approximately homogeneous subset of our data lies in a small region along the Franciscan block. All methods return similar power-law parameters, though the range of the joint 95% confidence regions is large (Q 0 = 85 ± 40; η = 0.65 ± 0.35). The RTS and TS methods differ the most from the other methods and from each other. This may be due to the removal of the site term in the RTS method, which is shown to be significant in the San Francisco Bay Area. In order to completely understand the range of power-law Q in a region, it is advisable to use several methods to calculate the model. We also test the sensitivity of each method to changes in geometrical spreading, Lg frequency bandwidth, the distance range of data, and the Lg measurement window. For a given method, there are significant differences in the power-law parameters, Q 0 and η, due to perturbations in the parameterization when evaluated using a conservative pairwise comparison. The CN method is affected most by changes in the distance range, which is most probably due to its fixed coda measurement window. Since, the CS method is best used to calculate the total path attenuation, it is very sensitive to the geometrical spreading assumption. The TS method is most sensitive to the frequency bandwidth, which may be due to its incomplete extraction of the site term. The RTS method is insensitive to parameterization choice, whereas the SPRP method as implemented here in the time-domain for a single path has great error in the power-law model parameters and η is strongly affected by changes in the method parameterization. When presenting results for a given method it is best to calculate Q 0 f η for multiple parameterizations using some a priori distribution.

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“…The Lg Q (Figure 5b) provides additional information about tectonic processes that have an influence on the surface topography. In general, high Q values are associated with tectonically active regions which are associated with partial melt in the crust [ Fan and Lay , 2002, 2003a, 2003b; Xie , 2002a, 2002b]. High Q values correlate well with the areas with both high and rough topography.…”

Section: Linking Surface Topography With Lithospheric and Upper Mantlmentioning

confidence: 99%

Tectonic geomorphometrics of the western United States: Speculations on the surface expression of upper mantle processes

Coblentz

Karlstrom

2011

Geochem. Geophys. Geosyst.

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[1] The topography of the western United States provides a classic field laboratory for investigations of the relationship between surface features and sub-crustal dynamic processes. The interpretation of recently collected, high-resolution seismic images of the upper mantle beneath the central Colorado Rocky Mountains substantiates the notion that much of the high elevation coincides with thin or attenuated continental crust (with respect to predicted Airy crustal thicknesses), necessitating topographic support by anomalously buoyant mantle. This is highly suggestive that broad-scale topographic features may be correlated with buoyancy variations in the upper mantle. In an attempt to sharpen our understanding of the underlying geodynamics, we evaluate the correlation between the surface topographic character and data sets that provide information about density variations indicative of buoyancy in the upper mantle, including the lithospheric geoid, upper mantle seismic velocity anomalies, and crustal (Lg) Q. Our general conclusion is that mantle buoyancy is driving differential surface uplift throughout the western United States and this driver of topography is manifested by measureable anomalies in the topographic roughness at short wavelengths (tens of kilometer) and elevated spectral power in the topography at longer (several hundred kilometers) wavelengths. A provocative conclusion is that the long-recognized physiographic provinces of the Colorado Plateau, Rocky Mountains, and Rio Grande rift are also neotectonic provinces that are related to convective processes and related buoyancy in the upper mantle.Components: 9900 words, 11 figures.

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Strong Lg wave attenuation in the Northern and Eastern Tibetan Plateau measured by a two‐station/two‐event stacking method

Cited by 34 publications

References 12 publications

Collaborative Research: High-Resolution Seismic Velocity and Attenuation Models of Western China

Collaborative Research: High-Resolution Seismic Velocity and Attenuation Models of Western China

Regional Attenuation in Northern California: A Comparison of Five 1D Q Methods

Tectonic geomorphometrics of the western United States: Speculations on the surface expression of upper mantle processes

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