Crustal deformation of intermontane basins beneath Central Tien Shan revealed by full-wave ambient noise tomography

Lü, Ziqiang; Lei, Jianshe; Zhao, Lihong; Xiang, Fu; Chen, Jianping; Li, Guanghe; Kong, Qinghan

doi:10.1016/j.tecto.2021.229143

Cited by 4 publications

(8 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the South Tien Shan, the LAB is located at ~100-130 km depths (D1); it dips northward (Figure 5). Seismic tomography revealed a clear northwarddipped high-velocity body in the upper mantle that was generally interpreted as the Tarim lithosphere under the South Tien Shan [23][24][25][26][27][28]44]. Detailed crustal structures favor northern intrusion or underthrust of the Tarim lithosphere rather than subduction [20,45].…”

Section: Discussionmentioning

confidence: 99%

“…High Vp/Vs ratios (>1.73) under the Central Tien Shan imply the partial melting within the crust, which argues for the magmatic intrusion of the hot upwelling mantle material [19]. Some inclined high velocity anomalies in the upper mantle are proposed to be the subducting Tarim lithosphere under the South Tien Shan and the Kazakh lithosphere under the North Tien Shan [23][24][25][26][27][28]. Besides, low velocity zones are imaged in the top 150 km under the Central Tien Shan (e.g., [23,26]).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stepwise Lithospheric Delamination Leads to Pulsed Cenozoic Uplifts of Central Tien Shan

2022

View full text Add to dashboard Cite

The Tien Shan provides an ideal site to study mechanism of intracontinental orogeny due to distant effect of Indo-Asian collision. We investigate lithospheric structures, in particular the lithosphere-asthenosphere boundary (LAB), of Central Tien Shan (CTS) using S wave receiver functions. The results show distinct structures across the orogen. Under the southern CTS, the LAB is shallower than that of the Tarim Basin; a 50 km vertical offset implies that part of the lithosphere has been delaminated. Under the middle CTS, two phases of negative velocity gradient are obtained, which may indicate a new LAB and an ongoing delamination underneath. Under the northern CTS and Kazakh Shield northward, the lithosphere is stable although the LAB inclines southward slightly. The two periods of lithospheric delamination under the southern and middle CTS account well for pulsed uplifts of the Tien Shan at ~11-8 Ma and ~5-0 Ma, respectively.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stepwise Lithospheric Delamination Leads to Pulsed Cenozoic Uplifts of Central Tien Shan

2022

View full text Add to dashboard Cite

show abstract

“…The KBK station is designated as a virtual source at the center of the KN array, and we then attempt to determine the location of this station by analyzing the empirical Green’s functions between all of the other stations with the KBK station. The ambient noise interferometry is dominantly composed of surface waves at periods larger than 5 s in the study region 26 , 38 . Receiver stations located in the vicinity of the virtual source tend to retain more pronounced amplitudes due to surface waves are most sensitive to the near-surface structures in the shorter distance, which allows for more accurate detection and measurement of the surface waves, and can help in determining the noise source location with low uncertainty.…”

Section: Applicationmentioning

confidence: 99%

“…The Rayleigh wave empirical Green’s functions are derived by analyzing the cross-correlation of ambient noise waveforms between pairs of stations during 1997–2000, following the method described by Lü et al 26 . To ensure reliable empirical Green’s functions and enhance the signal-to-noise ratio, we first remove the instrument response and then truncate the resulting displacement seismogram to a daily duration.…”

Section: Applicationmentioning

confidence: 99%

“…Ambient noise interferometry is a powerful technique to construct surface waves for imaging the structure of the Earth’s subsurface by utilizing cross-correlation from the noise signals generated by natural sources 24 , 25 . It has been applied in various fields, such as seismic tomography, volcanic activity monitoring, and civil engineering, to identify different types of subsurface structures, volcano hazards, and structural fractures 3 , 26 – 28 , allowing to conduct of an effective analysis and monitoring systems. Long-time stacking of ambient noise cross-correlations can extract a high signal-to-noise ratio and stable surface wave signals from the source to the receivers 29 , which are generally stronger and much slower compared with the body waves.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Regional noise source location based on the time delays between station pairs from ambient noise interferometry

Lü,

Liu,

Kong

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

Identifying the location of a potential noise source assists in understanding the characteristics of the seismic or volcanic activity and provides valuable information for hazard assessment. Unlike the conventional waveform-based techniques that rebuild the source energy into the possible source region, we apply a simplified method to determine the absolute location of the noise source based on the station-pair time-delays from ambient noise interferometry. Synthetic tests demonstrate the robustness of the method and the locating precision is mainly influenced by the signal-to-noise ratio of the synthetic waveforms, and the higher frequency bandwidth source signals are more likely to result in accurate detection of the source. An application at the Central Tien Shan indicates that our method is capable of locating the known virtual source from the empirical Green’s functions. Furthermore, assuming a surface wave velocity, the depth of the source can be generally recovered from ambient noise interferometry in a simplified 3-D homogeneous model. The new method sheds light on applications of ambient noise interferometry for locating potential sources, making it suitable for detecting time-dependent behavior.

show abstract

Fault-scale crustal structure across the Dunhua-Mishan fault (Tanlu northern segment) constrained from teleseismic P-wave receiver functions

Liu,

Lü,

Zhang

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

The Dunhua-Mishan fault, located in the northern segment of the Tanlu fault zone, experienced multiple tectonic processes associated with the effects of the Pacific Plate subduction and the Indo-Asia collision. The high-resolution fault-scale structure is critical for understanding the fault evolution and potential fault damage. However, the well-defined deep structure of the Dunhua-Mishan fault is still unclear due to the lack of the dense seismic array. In this study, we construct a high-resolution P-wave receiver function imaging based on linear dense seismic array across the fault. Our results reveal the strong Moho depth variation across the Dunhua-Mishan fault zone. The slightly higher Vp/Vs ratio values within the fault zone indicate the presence of a small amount of mafic crust composition. Interestingly, the significant double positive Ps converted phases are observed within the fault zone, which may represent double Moho discontinuities. The double Moho structure may be related to multiple significant tectonic activities in the Tanlu northern segment. These newly observed structures provide new seismic constraints on the formation and evolution of the Tanlu fault zone and probably reflect that the lithospheric structure of the Dunhua-Mishan fault has been modified by a series of tectonic processes.

show abstract

Crustal deformation of intermontane basins beneath Central Tien Shan revealed by full-wave ambient noise tomography

Cited by 4 publications

References 49 publications

Stepwise Lithospheric Delamination Leads to Pulsed Cenozoic Uplifts of Central Tien Shan

Stepwise Lithospheric Delamination Leads to Pulsed Cenozoic Uplifts of Central Tien Shan

Regional noise source location based on the time delays between station pairs from ambient noise interferometry

Fault-scale crustal structure across the Dunhua-Mishan fault (Tanlu northern segment) constrained from teleseismic P-wave receiver functions

Contact Info

Product

Resources

About