Search

A 6.9 magnitude earthquake hit Menyuan County, Haibei Prefecture, Qinghai Province, at 01:45 PM Beijing time on January 8, 2022 (17:45 PM GMT time on January 7, 2022). To explore the magnitude of the earthquake deformation and the affected area, this work combined optical remote sensing interpretation, interferometric synthetic aperture radar (InSAR) coseismic deformation extraction, and field surveys for research and analysis. Relying on the high-resolution Earth observation system of the Qinghai Remote Sensing Center for Natural Resources, high-resolution GF1D, GF2, and TRIPLESAT optical remote sensing images were acquired immediately after the earthquake. The airborne triangulation encryption method was used to carry out orthographic correction, fusion, and mosaic processing of digital orthophoto map (DOM) and digital surface model (DSM) images, and first-hand optical remote sensing images of the disaster areas were obtained. Based on differential InSAR (D-InSAR), small baseline subset InSAR (SBAS-InSAR) and lifting rail fusion methods, the coseismic deformation field and deformation rate of the lifting rail direction were obtained by using Sentinel-1A data processing before and after the earthquake. Combined with optical interpretation, InSAR deformation, and field investigation, the results show that the deformation trend of the line of sight (LOS) images to the north and south of the ascending and descending orbits show an obvious opposite trend. The surface shape variables are −50 to 45 cm and −65 to 72 cm, respectively, and the deformation rate before the earthquake reached 25 cm/year. The deformation field characteristics show that the earthquake was mainly due to thrust, and the coseismic deformation field fractured along the WNW‒ESE direction with a length of approximately 33 km. The areas affected by 10 mm, 20 cm, and 50 cm deformation magnitudes in the whole earthquake area were 975.14, 321.10, and 38.55 km2, respectively. Within 20 km, there were two main affected townships, namely, Sujitan Township and Huangcheng Mongolian Township. Within 50 km, there were four main affected towns and townships, namely, Sujitan Township, Mongolian Township of the Imperial city, Qingshizui town, and Haomen town.

The relationship between the geographical environment and international politics is the main concern in geopolitical research. The existing publications were either inclined to environmental determinism, focused on the geographical imagination constructed by subjective discourse, or investigated the elements in the geographical environment as a whole to explore their interaction with politics. Evidently, discussion is lacking on how geo-entities use the spatial (structure) differentiation of geographical environments to act on power space and their geo-setting effects. Combining theoretical construction and case analysis, this study demonstrates the medium properties of geographical environment and its difference in efficiency of transmission power by proposing the concept of "geographical medium," and clarifies the geopolitical functions of different geographical mediums. Taking Ukraine as a case, the spatial practice of geo-entities mining is revealed herein; furthermore, the role of medium properties of the geographical environment in the enactment of power and their geo-setting effects are demonstrated. The results show that: (1) located in the geostrategic intersection zone, the geographical environment of Ukraine has a significant medium property, which provides a spatial intermediary for actors to establish power in Ukraine; (2) the geopolitical functions of various medium elements in Ukraine's geographical environment and their power transmission effectiveness to actors are significantly different. Geographical position and topography are geo-security functions. Natural resources have powerful geo-economic functions. Political parties and nationalities have strong geopolitical functions, while languages and religions have more prominent geocultural functions. The media attributes of natural resources, political parties, nationalities, and religions are strong; by contrast, the media attributes of geographical location and topography are gradually weakening; (3) different geo-entities (interest groups) compete to use the medium properties of the geographical environment to enact power, so that their geo-potential in Ukraine has alternating growth and decline, which intensifies turbulence in Ukraine's geo-setting. Finally, exploring the spatial practice and its effects of power exertion from the perspective of geographical media has enlightening significance for enhancing China's geopolitical influence abroad.

The establishment of marine protected areas (MPAs) is an important method to ensure marine protection. To protect and conserve global marine biodiversity, with the adoption of the "Kunming-Montreal Global Biodiversity Framework" during the 15th meeting of the Conference of the Parties of Convention on Biodiversity (CBD) in December 2022, the establishment of an effectively managed MPA network by 2030 and the protection of 30% of the world's oceans will be common goals for all countries party to the CBD over the next decade. Based on the distribution of over 150 types of marine species, habitats, ecosystems, and abiotic elements, ArcGIS10.5 and Zonation are used in this study to calculate the marine protection priority levels of coastal, nearshore, open ocean, and deep ocean trench areas, and a plan to reach the "30 by 30" targets is proposed. The suggestions for scientifically identifying and managing MPAs are as follows: first, improve MPA planning and establish a well-connected MPA network in national jurisdictions, then conduct scientific marine investigations to obtain background data on MPA establishment and delimitation. [ABSTRACT FROM AUTHOR]

The investigation of intergovernmental conferences is an important lens to examine international geopolitical issues that seem to remain understudied in the existing literature, especially from the perspective of how emerging countries shape their discourse, image, and geopolitical imaginations through such conferences. This paper aims to read China's relationships with the outside world from both its holding and participating in intergovernmental conferences between 2002 to 2017. Based on the textual analysis of conference materials from 919 intergovernmental conferences in which China has been involved, this paper highlights three lines with which China's self-definition of its geopolitical positions in international politics can be understood. First, China's delicate balance between the United States and Russia consists of the most fundamental structure of Chinese geopolitical views; second, China's self-construction as a responsible regional power also makes up a large portion of China's geopolitical view; third, the crucial role of intergovernmental conferences for the Chinese government is to convey China's nonthreatening model of development, which is also the most important principle of China's foreign relations. This paper helps to understand how China constructs its international relations and shapes international discourse and image through intergovernmental conferences. Such conference-based and self-defined geopolitics has furnished a special and, most importantly, a Chinese-styled geopolitical view that can further the understanding of international politics. [ABSTRACT FROM AUTHOR]

Objectives: Marine biodiversity and ecosystem services in the high seas are threatened by numerous stress factors caused by human activities, including global shipping, high-sea fishing, marine plastic pollution, and anthropogenic climate change. Socioeconomic factors are one of the criteria for the establishment of area-based management tools in the high seas for marine biodiversity conservation beyond national jurisdiction. The aim of the work is to propose a spatiotemporal approach to identify risks from marine human activities and recommendations for high seas governance. Methods: Data related to human activities from 2014 to 2022 were used to calculate the distribution and changes of human-related stressors, and the risk to marine biodiversity in the high seas caused by human activities. Results: The North Atlantic, Philippine Sea, Arabian Sea, Bay of Bengal, and East Central Atlantic show high and increasing intensities of human-related stressors, and are therefore particularly at need for the protection and conservation of marine biodiversity. Risks from human activities vary within the marine areas that are prioritized for biodiversity protection. The study recommends that the designation of high seas protected areas should take into account the types of risks to which the different marine areas are exposed, and that the high seas protected areas should be established gradually. At the same time, appropriate management measures should be formulated according to the intensity of human activities in the different marine areas. Conclusions: Quantifying and classifying the risk from human-related stressors could help identify solution for the protection and conservation and facilitate the marine spatial planning, establishment area based management tools, including marine protected areas in the high seas., Competing Interests: Declaration of conflicting interestsThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.