The MW≥6.5 strong earthquake events since 1990 around the Tibetan Plateau and control-earthquake effect of active tectonic system

It is of great scientific significance for regional seismic prevention and disaster mitigation to understand the characteristics and future trends of strong earthquakes related with the active continental collision-extrusion tectonic system in the Tibetan Plateau. The characteristics of MW≥6.5 strong earthquakes since 1990 and the earthquake-controlling phenomena of the continental collision-extrusion tectonic system in the Tibetan Plateau are comprehensively analyzed. The results indicate that the Tibetan Plateau has been in the period of slow release of seismic energy recently, but may be approaching the next period of rapid release. The“multi-level extrusion-rotation active tectonic system”in the continental collision-extrusion tectonic system of the Tibetan Plateau plays a major role in controlling this strong earthquakes process. In particular, the Bayan Hara extrusion tectonic unit shows the most significant strong seismic activity process in this tectonic system. The results of comprehensive study suggest that the earthquake-controlling effect of active tectonic system should be fully recognized in the analysis of activity trend and hazard of regional strong earthquake, which is helpful to scientifically judge the space-time migration process and the most likely location of strong earthquakes in the future. In the process of the current strong earthquake activity, the strong earthquake activity trend of the“multi-level extrusion-rotation active tectonic deformation system”in the Tibetan Plateau will continue in future. In particular, more attention should be paid to the future strong earthquake hazard of three large left-lateral strike-slip fault zones which constitute the boundary of extrusion blocks in the“multi-level extrusion-rotation active tectonic deformation system”, including Altyn-Qilian-Haiyuan fault system, East Kunlun fault zone and Xianshuihe-Xiaojiang fault zone

Representation Learning with Ordered Relation Paths for Knowledge Graph Completion

Incompleteness is a common problem for existing knowledge graphs (KGs), and the completion of KG which aims to predict links between entities is challenging. Most existing KG completion methods only consider the direct relation between nodes and ignore the relation paths which contain useful information for link prediction. Recently, a few methods take relation paths into consideration but pay less attention to the order of relations in paths which is important for reasoning. In addition, these path-based models always ignore nonlinear contributions of path features for link prediction. To solve these problems, we propose a novel KG completion method named OPTransE. Instead of embedding both entities of a relation into the same latent space as in previous methods, we project the head entity and the tail entity of each relation into different spaces to guarantee the order of relations in the path. Meanwhile, we adopt a pooling strategy to extract nonlinear and complex features of different paths to further improve the performance of link prediction. Experimental results on two benchmark datasets show that the proposed model OPTransE performs better than state-of-the-art methods

Seismic structure characteristics of the 18 December 2023 M6.2 Jishishan earthquake, Gansu Province

On 18 December 2023，at Beijing time，a M6.2 earthquake struck Jishishan in Gansu Province. A thorough analysis of the earthquake structure and characteristics was conducted by combining information on regional seismic tectonics, geology, seismic source mechanism, seismic intensity, and aftershock relocation. The earthquake was a reverse fault event trending north-northwest within the Xining-Lanzhou fault block. The earthquake-controlling tectonics of the earthquake is the Lajishan reverse fault zone，which is closest to the epicentre of the earthquake. The fault zone is situated at the intersection of the northwest-trending Riyueshan dextral strike-slip fault and the east-west-trending Western Qinling North Rim left-trending strike-slip fault. It has an overall northwest-to-north-northwest striking angle and comprises two branch fault zones with opposite trends in the southern and northern rims. The earthquake’s epicentre location, aftershock distribution, and intensity distribution data suggest that the specific fault responsible for this earthquake is the east branch fault of the southern section of the reverse fault zone at the northern rim of Lajishan. This is consistent with the characteristics of the upward disc effect of reverse fault-type earthquakes. Further detailed field investigations are required to determine the deformation of the earth’s surface. The Jishishan earthquake is thought to have been caused by reverse fault activity at the intersection of the Riyueshan strike-slip fault and the northern edge of the Western Qinling fault. This was triggered by the eastward lateral slip along the original left-hand strike-slip fault along the Xining-Lanzhou fault block on the northeastern margin of the Tibetan Plateau. This occurred under the northeast-directed extrusion tectonic stress field resulting from the ongoing land-land collision between the Indian and Eurasian plates. This earthquake suggests that the extrusion tectonic system at the eastern margin of the Tibetan Plateau remains the primary structure controlling strong seismic activity in China in recent years. Further attention should be paid to the risk of strong earthquakes within the fault block

A Uniform Device Information Access for Context-Aware Middleware

This paper presents a middleware for building context-aware applications. One of the main components, Device Information Access (DIA), is discussed in detail. Since many kinds of devices (e.g., RFID, GPS, Bluetooth, etc.) can be used to collect the context information, the middleware defines the Device Information Access component to communicate with different devices. A set of interfaces are devised in DIA, and the common functions such as getting and setting a data element are defined in the interfaces. For each device, we shall provide an implementation of the interfaces to communicate with the corresponding servers or software agents. DIA can communicate with the software agents or servers using various protocols such as RMI, Web Services, and REST. In this way the access to the hardware are encapsulated by the middleware and virtualized to the end-point App ications. The architecture of the middleware and the functions of DIA are discussed, and an empirical application is also developed to validate our design. ? 2010 IEEE.EI

Production of a high-efficiency cellulase complex via β-glucosidase engineering in Penicillium oxalicum

Additional file 6: Table S1. Primers used in this study

The strong earthquakes and seismogenic structures in eastern margin of Tibetan Plateau and adjacent areas: A preface for the special topic

The eastern margin of the Tibetan Plateau is composed of multiple secondary tectonic units which constitute typical “multi-level extrusion-rotation active tectonic system”. It is the tectonic transformation belt that regulates the eastward extrusion of plateau blocks, and contains high-density active faults. This area is characterized by frequent and high intensity strong earthquakes and complex geological and geomorphological features. Therefore, this region is one of the areas in China where the problem of earthquake disaster is particularly significant. In recent years, with the research deepening of the national earthquake disaster risk survey, active fault detection of urban，seismic experimental site construction, seismic safety evaluation of engineering sites, identification of active faults and evaluation of crustal stability in major projects sites and urban areas，and the wide application of high-precision remote sensing, tectonic geomorphology, paleoseismic and Quaternary chronology methods. The investigation of seismogenic structures around the eastern margin of the Tibetan Plateau and its adjacent areas has been significantly improved. In order to timely exchange the latest study results in this field support regional earthquake prevention and disaster reduction and geological safety evaluation of important projects sites and infrastructure construction, the journal editorial department of Progress in Earthquake Science organized the special topic “The strong earthquakes and seismogenic structures in eastern margin of Tibetan Plateau and adjacent areas”. More than 20 representative academic papers such as active faults and earthquakes, Jishishan earthquake in Gansu Province，and research reviews in related fields have been collected. In this issue, 10 papers are selected in the special topic I “The strong earthquakes and seismogenic structures in eastern margin of Tibetan Plateau and adjacent areas”. It is hoped that these newly study results may improve the understanding of characteristics of strong earthquake activity and seismogenic structural mechanism in the region, and provide scientific basis for regional strong earthquake risk analysis and effective prevention of strong earthquake disaster risk

An Investigation of Decision Analytic Methodologies for Stress Identification

In modern society, more and more people are suffering from some type of stress. Monitoring and timely detecting of stress level will be very valuable for the person to take counter measures. In this paper, we investigate the use of decision analytics methodologies to detect stress. We present a new feature selection method based on the principal component analysis (PCA), compare three feature selection methods, and evaluate five information fusion methods for stress detection. A driving stress data set created by the MIT Media lab is used to evaluate the relative performance of these methods. Our study show that the PCA can not only reduce the needed number of features from 22 to five, but also the number of sensors used from five to two and it only uses one type of sensor, thus increasing the application usability. The selected features can be used to quickly detect stress level with good accuracy (78.94%), if support vector machine fusion method is used.EI041675-1699