scholarly journals Massive lithospheric delamination in southeastern Tibet facilitating continental extrusion

2021 ◽  
Author(s):  
Jikun Feng ◽  
Huajian Yao ◽  
Ling Chen ◽  
Weitao Wang

Abstract Significant left-lateral movement along the Ailao Shan-Red River fault accommodated a substantial amount of the late Eocene to early Miocene India-Asia convergence. However, the activation of this critical strike-slip fault remains poorly understood. Here, we show key seismic evidence for the occurrence of massive lithospheric delamination in southeastern Tibet. Our novel observation of reflected body waves (e.g. P410P and P660P) retrieved from ambient noise interferometry sheds new light on the massive foundered lithosphere currently near the bottom of the mantle transition zone beneath southeastern Tibet. By integrating the novel seismic and pre-existing geochemical observations, we highlight a linkage between massive lithospheric delamination shortly after the onset of hard collision and activation of continental extrusion along the Ailao Shan-Red River fault. This information provides critical insights into the early-stage evolution of the India-Asia collision in southeastern Tibet, which has significant implications for continental collision and its intracontinental response.

Geophysics ◽  
2021 ◽  
Vol 86 (1) ◽  
pp. F1-F8
Author(s):  
Eileen R. Martin

Geoscientists and engineers are increasingly using denser arrays for continuous seismic monitoring, and they often turn to ambient seismic noise interferometry for low-cost near-surface imaging. Although ambient noise interferometry greatly reduces acquisition costs, the computational cost of pair-wise comparisons between all sensors can be prohibitively slow or expensive for applications in engineering and environmental geophysics. Double beamforming of noise correlation functions is a powerful technique to extract body waves from ambient noise, but it is typically performed via pair-wise comparisons between all sensors in two dense array patches (scaling as the product of the number of sensors in one patch with the number of sensors in the other patch). By rearranging the operations involved in the double beamforming transform, I have developed a new algorithm that scales as the sum of the number of sensors in two array patches. Compared to traditional double beamforming of noise correlation functions, the new method is more scalable, easily parallelized, and it does not require raw data to be exchanged between dense array patches.


2020 ◽  
Vol 20 (10) ◽  
pp. 1682-1695
Author(s):  
Foziyah Zakir ◽  
Kanchan Kohli ◽  
Farhan J. Ahmad ◽  
Zeenat Iqbal ◽  
Adil Ahmad

Osteoporosis is a progressive bone disease that remains unnoticed until a fracture occurs. It is more predominant in the older age population, particularly in females due to reduced estrogen levels and ultimately limited calcium absorption. The cost burden of treating osteoporotic fractures is too high, therefore, primary focus should be treatment at an early stage. Most of the marketed drugs are available as oral delivery dosage forms. The complications, as well as patient non-compliance, limit the use of oral therapy for prolonged drug delivery. Transdermal delivery systems seem to be a promising approach for the delivery of anti-osteoporotic active moieties. One of the confronting barriers is the passage of drugs through the SC layers followed by penetration to deeper dermal layers. The review focuses on how anti-osteoporotic drugs can be molded through different approaches so that they can be exploited for the skin to systemic delivery. Insights into the various challenges in transdermal delivery and how the novel delivery system can be used to overcome these have also been detailed.


1992 ◽  
Vol 97 (B5) ◽  
pp. 7159 ◽  
Author(s):  
T. Mark Harrison ◽  
Chen Wenji ◽  
P. H. Leloup ◽  
F. J. Ryerson ◽  
Paul Tapponnier

Author(s):  
Chao Lei ◽  
Jianye Ren ◽  
Jianxiang Pei ◽  
Bowen Liu ◽  
Xiang Zuo ◽  
...  
Keyword(s):  

2010 ◽  
pp. 747-750
Author(s):  
Leyin Hu ◽  
Jingfa Zhang ◽  
Xiaoqing Shang ◽  
Huifang Zhou ◽  
Chenglong Li ◽  
...  

2021 ◽  
Vol 9 ◽  
Author(s):  
Mohamed A. Daw

Background: Since the Arab uprising in 2011, Libya, Syria and Yemen have gone through major internal armed conflicts. This resulted in large numbers of deaths, injuries, and population displacements, with collapse of the healthcare systems. Furthermore, the situation was complicated by the emergence of COVID-19 as a global pandemic, which made the populations of these countries struggle under unusual conditions to deal with both the pandemic and the ongoing wars. This study aimed to determine the impact of the armed conflicts on the epidemiology of the novel coronavirus (SARS-CoV-2) within these war-torn countries and highlight the strategies needed to combat the spread of the pandemic and its consequences.Methods: Official and public data concerning the dynamics of the armed conflicts and the spread of SARS-COV-2 in Libya, Syria and Yemen were collected from all available sources, starting from the emergence of COVID-19 in each country until the end of December 2020. Datasets were analyzed by a set of statistical techniques and the weekly resolved data were used to probe the link between the intensity levels of the conflict and the prevalence of COVID-19.Results: The data indicated that there was an increase in the intensity of the violence at an early stage from March to August 2020, when it approximately doubled in the three countries, particularly in Libya. During that period, few cases of COVID-19 were reported, ranging from 5 to 53 cases/day. From September to December 2020, a significant decline in the intensity of the armed conflicts was accompanied by steep upsurges in the rate of COVID-19 cases, which reached up to 500 cases/day. The accumulative cases vary from one country to another during the armed conflict. The highest cumulative number of cases were reported in Libya, Syria and Yemen.Conclusions: Our analysis demonstrates that the armed conflict provided an opportunity for SARS-CoV-2 to spread. The early weeks of the pandemic coincided with the most intense period of the armed conflicts, and few cases were officially reported. This indicates undercounting and hidden spread during the early stage of the pandemic. The pandemic then spread dramatically as the armed conflict declined, reaching its greatest spread by December 2020. Full-blown transmission of the COVID-19 pandemic in these countries is expected. Therefore, urgent national and international strategies should be implemented to combat the pandemic and its consequences.


2017 ◽  
Vol 4 (1) ◽  
pp. 32-35
Author(s):  
Sivaranjani K ◽  
Rajarajan S

God created women in the incarnation of himself how flowers are soft and tender women’s attitude also springy and gentle. In every bud beautiful flowers hiding themselves like in every woman their powerful attitude towards nature are camouflaged, their potentiality will prim out automatically in a needy situationand they shine beautifully like full bloomed flowers in their looming. Women are like grey, white moths in the earlier phase without maturity, they may act childishly. But through their full prime of life and progress, they turned into the spectacular multihued butterfly and they burnish glowing in their society and family life. That’s the attitude of Clarissa,who behaved has a moth in early stage, thenmatured as a full blown fantabulous butterfly by giving the party. The novel “Mrs. Dalloway” starts and ends on the same day by narrating how human beings are close with nature and how they preserve and conserve ourenvironment..


2009 ◽  
Vol 476 (3-4) ◽  
pp. 397-417 ◽  
Author(s):  
Mangzheng Zhu ◽  
Stephan Graham ◽  
Tim McHargue

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