A5101738690- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Rock Mechanics and Modeling
- Seismology and Earthquake Studies
- Analytical Methods in Pharmaceuticals
- Surfactants and Colloidal Systems
- Analytical Chemistry and Chromatography
- Petroleum Processing and Analysis
- Geoscience and Mining Technology
- Geological and Geophysical Studies
- Structural Health Monitoring Techniques
- Soil, Finite Element Methods
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Rheology and Fluid Dynamics Studies
- Mining and Gasification Technologies
- Aerosol Filtration and Electrostatic Precipitation
- Radioactive element chemistry and processing
- Metamaterials and Metasurfaces Applications
- Biochemical and Molecular Research
- Advanced Fiber Optic Sensors
- Soil Moisture and Remote Sensing
China Earthquake Administration
2015-2024
Institute of Geology, China Earthquake Administration
2020-2023
Zhejiang Police College
2023
Hohai University
2022
Xi'an Shiyou University
2012-2018
Hubei University of Chinese Medicine
2008
Wuhan University
2008
Chongqing University
2000
Abstract This paper proposes an actively tunable reflective metasurface containing solely addressable meta-atoms capable of continuous phase adjustment within the microwave frequency range. Each meta-atom’s response can be quickly and accurately adjusted by adjusting external voltage applied to each meta-atom, thereby regulating distribution unit structures on metasurface. Successful generation with three modes vortex beams. Additionally, focusing non-diffracting beams limited beam radii are...
Nowadays, SAR instruments such as ESA's Sentinel-1 constellation, ICEYE's constellation of small and agile radar satellites, the upcoming ALOS-4 NASA/ISRO missions provide new opportunities for near-real-time monitoring geohazards with enhanced spatiotemporal resolution. Sequential dynamic adjustment model is regarded an effective way to rapidly update time-series InSAR measurements. However, accuracy geophysical parameters interest estimated from conventional sequential least squares...
We analyzed the far-field co-seismic response of M W 9.0 Tohoku-Oki earthquake, which occurred on March 11th 2011 at Japan Trench plate boundary. Our analysis indicates that displacement was very sensitive to magnitude this event, and a significant surface from earthquakes in region can be observed Eurasia only for events ≥ 8.0. also temporal characteristics near-field post-seismic deformation caused by afterslip viscoelastic relaxation following earthquake. Next, we performed simulation...
摘要: 断层滑动速率是理解复杂断层系统应变分配与评估地震危险性的重要参数,在多种研究方法中,利用构造地貌学方法限定走滑断裂的第四纪滑动速率较为普遍. 在青藏高原活动断裂体系中,海原断裂带承载了部分印度-欧亚板块碰撞产生的应变,其滑动速率的精细厘定也是高原构造变形动力学分析的重要参数. 过去三十年间前人采用构造地貌学方法对其进行了大量的滑动速率研究,结果位于2.3~16 mm/a之间,不同研究间相差较大,因此引发了众多争议与困惑. 在对已有研究进行详细评述的基础上,指出前人研究结果不确定性的重要原因是上级阶地与下级阶地重建模型的选择. 结果认为,基于两种位移累积起始时间定义的模型得到的往往是滑动速率的上限或下限,不能简单地将其等同于滑动速率真实值. 当缺乏观测数据可以辅助判别两种模型的可靠程度时,应基于上、下级阶地废弃年龄同时对滑动速率进行限定,这是对滑动速率计算过程中客观存在的不确定性的尊重和认可. 海原断裂带滑动速率的评估将为后续基于青藏高原内部诸多活动断裂进行两种端元变形模型合理性的分析工作提供重要的方法借鉴. 关键词: 滑动速率 / 海原断裂带 构造地貌学 河流阶地陡坎 上、下限评估
ABSTRACT Surface ruptures and coseismic slip distributions of large earthquakes are the keys to understanding earthquake rupture processes, analyzing history associated faults, assessing hazards. Detailed mapping surface historical is needed but difficult in remote regions. The 1955 Ms 7.5 Zheduotang occurred a prominent restraining bend central sinistral Xianshuihe fault within high-relief densely vegetated mountain range. This study characterizes via 50 cm resolution airborne light...
On January 8, 2022, a 6.9 magnitude earthquake occurred in Menyuan County, Qinghai Province, with the epicenter located at intersection of Tuolaishan Fault and Lenglongling Fault, which are part Qilian–Haiyuan fault zone. This study investigated sliding characteristics seismic mechanism to understand activity risk on northeastern margin Qinghai–Tibet Plateau. In this paper analyzed Sentinel-1 synthetic aperture radar images obtain coseismic deformation field earthquake, was then used invert...
A sequence of Ms ≥ 5.0 earthquakes occurred in 2003 and 2004 Bange County, Tibet, China, all with similar depths focal mechanisms. However, the source parameters, kinematics relationships between these are poorly known because their moderately-sized magnitude sparse distribution seismic stations region. We utilize interferometric synthetic aperture radar (InSAR) data from European Space Agency’s Envisat satellite to determine location, fault geometry slip three large events that on 7 July...
With the rapid development of modern Interferometric Synthetic Aperture Radar (InSAR) missions, SAR instruments with wider coverage can be used to monitor ground surface deformation from regional global scale. However, ocean tide loading (OTL) displacement is becoming a primary source errors. It contributes long-wavelength signal in InSAR interferograms, leading errors millimeter centimeter-level monitoring, especially over coastal areas. Although state-of-the-art has applied models mitigate...
The East Kunlun fault zone (EKFZ), located northeast of the Qinghai–Tibet Plateau, has experienced several strong earthquakes magnitude seven or above since 1900. It is one most active systems and characterized by left-lateral strike-slip. However, Xidatan–Dongdatan segment (XDS) (EKFZ) had no for many years, Mountains MS 8.1 earthquake a stress loading effect on this segment, so it widely regarded as high-risk gap. To end, we collected Sentinel-1 data XDS EKFZ from July 2014 to 2019...
On 8 January 2022, a Ms 6.9 earthquake occurred in Menyuan, Qinghai, China. This event provided important geodetic data before and after the earthquake, facilitating investigation of slip balance along seismogenic faults to understand behavior assess seismic risk. In this study, we obtained interseismic (2016–2021) coseismic deformation fields 2022 using Sentinel-1 synthetic aperture radar (SAR) images estimated rate, fault locking, faults. The results indicated that Menyuan i.e.,...
A new and easy-to-prepare, surfactant-based polymer-free fluid, CTAB-SA, consists of etradecyl trimethyl ammonium bromide, cetyl bromide octadecyl with salicylic acid is described. The properties as a fracturing fluid were evaluated regard to viscoelasticity proppant carrying capability. results showed that these water gels have strong proppant-carrying capacity high viscoelasticity, the best performance was obtained from derived acid. increase quality ratio
In this work, a series of hydroxylmethyl pentamine (HMPA) was synthesized from vegetable oil, tetraethylene and hexamethylenetetramine, which evaluated as crude oil flow improver. The results showed that HMPAs have good viscosity reduction effect on the Yanchang Oilfield, with highest rate 93%. pour point depression achieved 5.4°C. Paraffin crystal morphology characterization conducted to elucidate mechanism depression.