Crustal structure of Chuan-Dian region derived from gravity data and its tectonic implications

“…Tectono-geomorphic analysis shows that the northern part of the DYR is characterized by left lateral strike slip movement evidenced by offset landforms, whereas the middle and southern parts are characterized by normal slip to accommodate the east-west extension of the south Tibetan Plateau. Crustal geologic cross-section is from Cogan et al (1998; Moho depth is inferred from Chuan-Dian region (Jiang et al, 2012) and also referenced from Teng et al (2013. The focal mechanism of the earthquakes happened in 2008 is from the Harvard solution at http://www.globalcmt.org. Block diagram of the Damxung-Yangbajain rift in the south Tibetan Plateau.…”

Section: Discussionmentioning

confidence: 99%

Stream profile analysis, tectonic geomorphology and neotectonic activity of the Damxung‐Yangbajain rift in the south Tibetan Plateau

Jiang

Han

Zhang

et al. 2016

Earth Surf Processes Landf

Self Cite

View full text Add to dashboard Cite

The Damxung‐Yangbajain rift is one of the most active north–south trending rifts in the south Tibetan Plateau, and it has been playing an important role in accommodating the east–west extension of the Tibetan Plateau. Both stream profiles on the Nyainqentanglha Range adjacent to the northwest part of the Damxung‐Yangbajain rift and tectonic geomorphology in the north of the rift are analyzed to assess the spatial pattern and intensity of rock uplift which is related to neotectonic activity. A total of 85 stream profiles across the Nyainqentanglha Range are analyzed, and 111 knickpoints are interpreted. Most of these stream profiles are characterized by prominent convexities with two or more knickpoints, many of which are formed due to the strong rock uplift evidenced by abnormal concavity and extremely high steepness indices during the Quaternary. Neotectonic activity in this region is well replicated in the stream profile indices and offset landforms. Tectono‐geomorphic analysis shows that the concavity and steepness indices correlate with the fault movements at many places. The Damxung‐Yangbajain rift is characterized by left‐lateral strike‐slip in the north of Damxung and by normal movement in middle and southern parts. The middle and southern parts have been undergoing higher uplift than has the northern area. It is most likely that the strong uplift is related to the heat flow under the crust. Earthquakes occurring in the Damxung‐Yangbajain rift, including a M8 in 1411 and M6.6 in 2008, are thought to be related to heat flow activity. All of the stream profile indices and tectonic geomorphology show that the Damxung‐Yangbajain rift is not in a stable state. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

“…Over the past 20 years, MSA has been proved to be a powerful tool for separation and interpretation of potential data (Hou and Yang, 1997;Fedi and Quarta, 1998;Ucan et al, 2000;Sailhac and Gibert, 2003;Xu et al, 2009;Jiang et al, 2012). Its advantage is that gravity anomalies can be decomposed into an approximate component and a series of detailed signals which are corresponding to the sources at different depths.…”

Section: Methods For Stress Inversion From Gravity Datamentioning

confidence: 99%

Multilayer stress from gravity and its tectonic implications in urban active fault zone: A case study in Shenzhen, South China

Wang

Luo

et al. 2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

It is significant to identify urban active faults for human life and social sustainable development. The ordinary methods to detect active faults, such as geological survey, artificial seismic exploration, and electromagnetic exploration, are not convenient to be carried out in urban area with dense buildings. It is also difficult to supply information about vertical extension of the deeper faults by these methods. Gravity, reflecting the mass distribution of the Earth's interior, provides an alternative way to detect faults, which is more efficient and convenient for urban active fault detection than the aforementioned techniques. Based on the multi-scale decomposition of gravity anomalies, a novel method to invert multilayer horizontal tectonic stresses is proposed. The inverted multilayer stress fields are further used to infer the distribution and stability of the main faults. In order to validate our method, the multilayer stress fields in the Shenzhen fault zone are calculated as a case study. The calculated stress fields show that their distribution is controlled significantly by the strike of the main faults and can be used to derive depths of the faults. The main faults in Shenzhen may range from 4 km to 20 km in the depth. Each layer of the crust is nearly equipressure since the horizontal tectonic stress has small amplitude. It indicates that the main faults in Shenzhen are relatively stable and have no serious impact on planning and construction of the city.

show abstract

Crustal structure of Chuan-Dian region derived from gravity data and its tectonic implications

Cited by 44 publications

References 26 publications

Systematic deflection and offset of the Yangtze River drainage system along the strike-slip Ganzi-Yushu-Xianshuihe Fault Zone, Tibetan Plateau

Systematic deflection and offset of the Yangtze River drainage system along the strike-slip Ganzi-Yushu-Xianshuihe Fault Zone, Tibetan Plateau

Stream profile analysis, tectonic geomorphology and neotectonic activity of the Damxung‐Yangbajain rift in the south Tibetan Plateau

Multilayer stress from gravity and its tectonic implications in urban active fault zone: A case study in Shenzhen, South China

Contact Info

Product

Resources

About