Viscosities of the crust and upper mantle constrained by three-dimensional GPS rates in the Sichuan–Yunnan fragment of China

She, Yawen; Fu, Guangyu

doi:10.1186/s40623-019-1014-x

Cited by 8 publications

(6 citation statements)

References 58 publications

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“…It is a frontier zone and a deep mass flow zone for the northeast-trending collisional extrusion of the Indian plate and Eurasian continent ( Fig. 1) (She and Fu 2019;Xu et al 2013). From the perspective of plate tectonics, due to the collision of the nearly SN-trending subducting Indian plate and Eurasian continent, the northern side of the Tibetan Plateau is blocked by the Siberian platform.…”

Section: Research Backgroundmentioning

confidence: 99%

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Liu

Kang

Chen

et al. 2019

Earth Planets Space

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A Curie surface indicates the distribution of the thermal fields underground, providing a clear marker for the thermodynamic effect in the crust and mantle. In this paper, based on a geomagnetic field model (NGDC-720) and aeromagnetic data, we use power spectrum analysis of magnetic anomalies to estimate the Curie surface in Yunnan Province, China, and its adjacent areas. By combining the distribution of the Curie surface with regional heat flow, the geothermal gradient, crustal wave velocity ratio anomalies, high-conductivity layer anomalies, and the Moho surface, we reveal the connection between the undulation of the magnetic basement and the crustal structures. The results indicate that the uplift and depression of the Curie surface in the research area are distinct. The Curie surface is approximately inversely correlated to the surface heat flow. The Lijiang-Jianchuan-Baoshan-Tengchong and Jianchuan-Chuxiong-Kunming-Yuxi zones are two Curie surface uplift zones, and their crust-mantle heat flows are relatively high. The Curie surface uplift zone along the Lijiang-Xiaojinhe fault and Red River fault is consistent with the heading direction of the fault zone and is partially in agreement with the eastward mass flow of the Tibetan Plateau. The Curie surface uplift zone is consistent with the high wave velocity ratio and high-conductivity layer anomaly region of the crust. The depth of the Curie surface is less than the depth of the Moho surface.

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Section: Research Backgroundmentioning

confidence: 99%

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Liu

Kang

Chen

et al. 2019

Earth Planets Space

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“…Therefore, the M s 4.3 Qiaojia earthquake can be considered a natural event. According to a previous study [33], the viscosity of the upper mantle is ~2.8 × 10 Pa • s, and the viscosity of the crust is less than 1.0 × 10 Pa • s in the Sichuan-Yunnan region. Reservoirs are usually designed to serve as power supplies for hundreds of years.…”

Section: Discussionmentioning

confidence: 87%

Numerical Simulation of the Influence of the Baihetan Reservoir Impoundment on Regional Seismicity

Wang,

Zhang,

Guo

et al. 2024

Applied Sciences

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The Baihetan Reservoir is built for hydropower in China. The rise of the reservoir water leads to a series of earthquakes in the surrounding area. This study proposes fully coupled equations of pore-viscoelasticity and a parallel partition mesh model to study the short- and long-term effects of the Baihetan Reservoir and further calculate the changes in stress, pore pressure, and Coulomb failure stress with time on the major faults. Based on the calculation results, impoundment increases regional seismicity, which is consistent with the seismic catalog. The reservoir impoundment causes an increase in pore pressure in the crust, primarily enhancing Coulomb failure stress beneath the reservoir center. This effect extends to approximately 60 km in length and 20 km in width at a depth layer of 5–10 km. Seismicity varies greatly among different faults. Coulomb failure stress increases on the northern part of the Xiaojiang Fault and Zhaotong-Ludian Fault, and decreases on the southern part of the Xiaojiang Fault and Zemuhe Fault. The Coulomb failure stress is highly correlated with the number of earthquakes along the Xiaojiang Fault. The influence of the reservoir on the local seismicity is mainly limited to several months, and it has a slight effect later on. The focal depth of the induced earthquakes increases while the magnitude decreases. The earthquakes caused by the impoundment all have a small magnitude, and the Ms4.3 Qiaojia earthquake on 30 March 2022, was more likely a natural event.

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“…To reduce the errors caused by different methods of processing GPS data, the weighted average method [ 36 ] was applied to obtain the average vertical rates of the same GPS observation stations (66 in total) from the datasets of [ 33 , 34 , 35 ]. The median errors of the observed data were taken as the weight in Figure 11 .…”

Section: Discussionmentioning

confidence: 99%

Gravity Observations and Apparent Density Changes before the 2017 Jiuzhaigou Ms7.0 Earthquake and Their Precursory Significance

Yang

Chen

Zhang

et al. 2021

Entropy

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An Ms7.0 earthquake struck Jiuzhaigou (China) on 8 August 2017. The epicenter was in the eastern margin of the Tibetan Plateau, an area covered by a dense time-varying gravity observation network. Data from seven repeated high-precision hybrid gravity surveys (2014–2017) allowed the microGal-level time-varying gravity signal to be obtained at a resolution better than 75 km using the modified Bayesian gravity adjustment method. The “equivalent source” model inversion method in spherical coordinates was adopted to obtain the near-crust apparent density variations before the earthquake. A major gravity change occurred from the southwest to the northeast of the eastern Tibetan Plateau approximately 2 years before the earthquake, and a substantial gravity gradient zone was consistent with the tectonic trend that gradually appeared within the focal area of the Jiuzhaigou earthquake during 2015–2016. Factors that might cause such regional gravitational changes (e.g., vertical crustal deformation and variations in near-surface water distributions) were studied. The results suggest that gravity effects contributed by these known factors were insufficient to produce gravity changes as big as those observed, which might be related to the process of fluid material redistribution in the crust. Regional change of the gravity field has precursory significance for high-risk earthquake areas and it could be used as a candidate precursor for annual medium-term earthquake prediction.

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Viscosities of the crust and upper mantle constrained by three-dimensional GPS rates in the Sichuan–Yunnan fragment of China

Cited by 8 publications

References 58 publications

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Studies on the relationships of the Curie surface with heat flow and crustal structures in Yunnan Province, China, and its adjacent areas

Numerical Simulation of the Influence of the Baihetan Reservoir Impoundment on Regional Seismicity

Gravity Observations and Apparent Density Changes before the 2017 Jiuzhaigou Ms7.0 Earthquake and Their Precursory Significance

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