Receiver Functions from Autoregressive Deconvolution

Wu, Qingju; Li, Yonghua; Zhang, Ruiqing; Zeng, Ruifeng

doi:10.1007/s00024-007-0269-5

Cited by 19 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We analyzed data from over 1800 events with body wave magnitude ≥5.5 and epicentral distance between 28° and 92°. A time window of 20 s before and 100 s after the P wave arrival was selected and RFs which isolate P ‐to‐ S conversions from seismic discontinuities were constructed using the maximum entropy (autoregressive) deconvolution method [ Tselentis , 1990; Q. Wu et al , 2007]. A 2.5 Hz Gaussian parameter was adopted in the deconvolution and the resultant RFs were further bandpass filtered with corner frequencies of either 0.03 and 1.0 Hz for wave equation migration (Figure 3) or 0.03 and 0.3 Hz for comparison of time domain stacks (Figure 2) and moveout corrected to the case of horizontal slowness p = 0 (as required for migration) [ Chen et al , 2005].…”

Section: Methodsmentioning

confidence: 99%

“…We analyzed data from over 1800 events with body wave magnitude !5.5 and epicentral distance between 28°a nd 92°. A time window of 20 s before and 100 s after the P wave arrival was selected and RFs which isolate P-to-S conversions from seismic discontinuities were constructed using the maximum entropy (autoregressive) deconvolution method [Tselentis, 1990;Q. Wu et al, 2007].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Discontinuity structure of the mantle transition zone beneath the North China Craton from receiver function migration

Chen

2009

J. Geophys. Res.

View full text Add to dashboard Cite

[1] A better understanding of the significant Phanerozoic tectonic reactivation and destruction of the North China Craton (NCC) demands a detailed knowledge of the deep structural features of the region. We applied the wave equation-based poststack migration technique to a combined receiver function data set from more than 250 broadband seismic stations to construct the structural image of the mantle transition zone beneath the NCC. Our imaging results reveal a relatively simple and flat 410-km discontinuity but a structurally complicated 660-km discontinuity beneath the region. Double discontinuities and a $30-km depression of the 660-km discontinuity are observed locally in the southern part of the eastern NCC, in contrast to the smoothly varying structure to the north and in the central and western parts of the craton. Distinctly rapid variations in both the 660-km discontinuity structure and mantle transition zone thickness were found across the northsouth gravity lineament (NSGL) near the boundary between the eastern and central NCC, which probably reflects different thermal and probably chemical properties on the two sides of the NSGL. These differences are possibly associated with the Pacific slab, which is imaged tomographically as a flat-lying structure in the mantle transition zone under the region east of the NSGL. The structural variation in the deep upper mantle appears to coincide with the sudden changes in surface topography, gravity field, and crustal and lithospheric structures as well, indicating that the two domains may have tectonically deformed differently throughout the whole upper mantle during the Phanerozoic cratonic destruction. The mantle transition zone on the eastern side of the NSGL is up to 30 $ 40 km thicker than the global average; this thickness and the complex structure of the 660-km discontinuity in this region may reflect the strong influence that the deep subduction and stagnancy of the Pacific slab, and its possible sporadic penetration into the lower mantle, have had on mantle dynamics and lithospheric reactivation in the eastern NCC since the Mesozoic time. On the other hand, the less variable structure and normal-to-thin mantle transition zone imaged beneath the central and western NCC may indicate that the IndiaEurasia collision has had a relatively weak effect on the Cenozoic tectonics of these regions.Citation: Chen, L., and Y. Ai (2009), Discontinuity structure of the mantle transition zone beneath the North China Craton from receiver function migration,

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Discontinuity structure of the mantle transition zone beneath the North China Craton from receiver function migration

Chen

2009

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…P wave receiver functions were calculated from teleseismic data by using the maximum‐entropy, time‐domain deconvolution method (Wu et al, ). A Gaussian filter value, α , of 2.5 was used to remove high frequency noise from the seismic data.…”

Section: Regional Geologic Setting and Previous Geophysical Studiesmentioning

confidence: 99%

Deep Structure of the Eastern Himalayan Collision Zone: Evidence for Underthrusting and Delamination in the Postcollisional Stage

et al. 2019

View full text Add to dashboard Cite

Based on broadband seismic data from 102 stations in the eastern Himalayan collision zone, the crustal thickness and Poisson's ratio were determined by using the H-κ stacking analysis of teleseismic P wave receiver functions. The Moho topography rapidly deepens northward in the northern Lhasa terrane, inferring the northern limit of the Indian plate underthrusting beneath Tibetan Plateau. Our seismic images show that steep subduction of the Indian plate occurs to the west of the Eastern Himalayan Syntaxis while gentle subduction to the east. The variation of subduction geometry of the Indian plate may be one of the causes for the formation of the eastern Himalayan Syntaxis. The 2-D crustal density modeling of the gravity measurements shows that the average crustal density in the eastern Himalayan collision zone is less dense than the global average continental crust, and our preferred model has 5-to 10-km-thick, high density layer (2,970-3,000 kg/m 3 ) in the lower crust beneath the eastern Lhasa terrane, consistent with mafic underplating. The attributes of a thickened crust with northward deepening Moho and low-to-normal Poisson's ratio might be the geophysical signature of delamination beneath the Lhasa terrane and underthrusting of Indian plate. We hypothesize that the orogenic root of the Lhasa terrane was removed by convective-driven delamination, followed by northward subduction of the Indian plate. Thus, delamination and continental subduction are the dominant deep processes in the postcollisional stage in the eastern Himalayan collision zone.

show abstract

“…P wave receiver functions are generally calculated from broadband teleseismic data by using a routine method of, e.g., Langston [1979] and Owens et al [1984]. In this study, we used a maximum‐entropy, time domain deconvolution method developed by Wu et al [2007]. In order to remove high‐frequency noise, a Gaussian filter value, α , of 2.0 was used.…”

Section: Calculation Of Receiver Functionsmentioning

confidence: 99%

Crustal thicknesses and Poisson's ratios in the eastern Tibetan Plateau and their tectonic implications

et al. 2010

View full text Add to dashboard Cite

[1] Crustal thicknesses and Poisson's ratios in the eastern Tibetan Plateau were estimated using the H-k stacking method on teleseismic receiver functions. The data came mainly from the regional seismic networks in 2006 show that the crust thickens from east to west, with a thickness difference of ∼30 km. A sharp change of crustal thickness from 41.5 to 52.5 km is observed across the Longmen Shan. Crustal thickness predictions based on the Airy-type isostasy are consistent with the estimations from H-k stacking, implying that the topography is approximately compensated. The study area can be divided into three parts according to the Poisson's ratios: (1) the northern Songpan-Garze terrane and the western Qinling orogenic belt with low ratios (n ≤ 0.26); (2) the southern Songpan-Garze terrane, the Sanjiang fold system, and the Sichuan Basin with high-to-intermediate ratios (0.27 ≤ n < 0.30); and (3) the southwestern Yangtze platform with low to intermediate ratios (n ≤ 0.27). Joint interpretation of the low average V p values from deep seismic sounding profiles and the low V p /V s ratios from receiver function analysis favors the presence of felsic crust rather than significant volumes of partial melts in the northern Songpan-Garze terrane and the western Qinling orogenic belt. The junction of the Longmen Shan fault zone, the Xianshuihe fault zone, and the Anninghe fault zone has an ultrahigh Poisson's ratio (n ≥ 0.30), which could be considered as an evidence of local partial melt. We propose that the eastward movement of upper and middle crustal material in the southern Songpan-Garze terrane is obstructed by the more rigid Sichuan Basin, resulting in strain accumulation along the Longmen Shan fault zone.

show abstract

Receiver Functions from Autoregressive Deconvolution

Cited by 19 publications

References 34 publications

Discontinuity structure of the mantle transition zone beneath the North China Craton from receiver function migration

Discontinuity structure of the mantle transition zone beneath the North China Craton from receiver function migration

Deep Structure of the Eastern Himalayan Collision Zone: Evidence for Underthrusting and Delamination in the Postcollisional Stage

Crustal thicknesses and Poisson's ratios in the eastern Tibetan Plateau and their tectonic implications

Contact Info

Product

Resources

About