Academic Articles & Research Papers

考虑诱发地震影响的砌体结构易损性分析

为揭示诱发地震和天然地震对建筑结构影响及其破坏概率分布的影响，本文以我国典型砌体结构为研究对象，开展了考虑诱发地震影响的易损性研究。首先建立了典型三层和六层砌体结构分析模型，然后以40条震级和震中距都接近的天然地震地震动和诱发地震地震动为输入开展Pushover分析，分别建立基于峰值加速度PGA和结构基本周期加速度反应谱值Sa的易损性曲线，最后采用循环往复加载方法对两次诱发地震作用下的结构倒塌易损性进行了分析讨论。结果表明：当以PGA作为易损性输入地震动参数时，天然地震地震动...

Observational Properties of Harmonic EMIC Waves: Statistical Study

Abstract Electromagnetic ion cyclotron (EMIC) waves are discrete electromagnetic emissions separated by multiple ion gyrofrequencies. Harmonic EMIC waves are defined as waves with a strong electric or magnetic field (or both) at the harmoni...

Excitation thresholds of field-aligned irregularities and associated ionospheric hysteresis at very high latitudes observed using SPEAR-induced HF radar backscatter

On 10 October 2006 the SPEAR high power radar facility was operated in a power-stepping mode where both CUTLASS radars were detecting backscatter from the SPEAR-induced field-aligned irregularities (FAIs). The effective radiated power of...

Observations on Stratospheric-Mesospheric-Thermospheric temperatures using Indian MST radar and co-located LIDAR during Leonid Meteor Shower (LMS)

The temporal and height statistics of the occurrence of meteor trails during the Leonid meteor shower revealed the capability of the Indian MST radar to record large numbers of meteor trails. The distribution of radio meteor trails du...

FROM BARCHAN TO DOMIC SHAPE: EVOLUTION OF A COASTAL SAND DUNE IN NORTHEASTERN BRAZIL BASED ON GPR SURVEY

ABSTRACT A sand dune located near São Bento do Norte and Caiçara do Norte towns (northern coastal region of Rio Grande do Norte state, Northeastern Brazil) is rapidly migrating toward urban areas. To understand the depositional processes (e...

Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano

We analyse a microgravity data set acquired from two spring LaCoste & Romberg gravity meters operated in parallel at the same site on Etna volcano (Italy) for about two months (August – September 2005). The high sampling rate acquisitio...

A Multi-Frequency Tomographic Inverse Scattering Using Beam Basis Functions

We present an overview of a beam-based approach to ultra-wide band (UWB) tomographic inverse scattering, where beam-waves are used for local data-processing and local imaging, as an alternative to the conventional plane-wave and Green’s fun...

Correlations Between Subduction of Linear Oceanic Features and Arc Volcanism Volume Around the Pacific Basin

Abstract Arc volcanoes, created by magma generated from the dehydration of subducting slabs, show great variability in their sizes and along‐arc spatial distributions. In this study, we address a fundamental question, namely, how do subduct...

The solar wind plasma density control of night-time auroral particle precipitation

DMSP F6 and F7 spacecraft observations of the average electron and ion energy, and energy fluxes in different night-time precipitation regions for the whole of 1986 were used to examine the precipitation features associated with solar win...

MFEFNet: An Efficient Network for Infrared Small Target Detection With Multiview Feature Extraction and Multiscale Attention Fusion

Infrared small target detection (IRSTD) remains a core challenge in remote sensing, mainly due to low signal-to-noise ratios, small target sizes, background interference, and large-scale variations. Although existing methods have achieved p...

The Beginning of a Wilson Cycle in an Accretionary Orogen: The Mongol–Okhotsk Ocean Opened Assisted by a Devonian Mantle Plume

Abstract The opening of oceans within accretionary orogens is important for understanding the Wilson cycle. The Mongol–Okhotsk Ocean (MOO) began opening within the early Paleozoic accretionary collage of the Central Asian Orogenic Belt (CAO...

Neural computing in geophysics

The 17th century philosopher-mathematician Rene Descartes offered the statement “Cogito, ergo sum” or “I think, therefore I am” as proof of his personal existence. While modern computers using artificial intelligence technologies cannot mat...

Reservoir geophysics

Abstract The concept of petroleum reservoir geophysics is relatively new. In the past, the role of geophysics was largely confined to exploration and, to a lesser degree, the development of discoveries. As cost-efficiency has taken over as ...

Environmental Geophysics

Basic exploration geophysics

The Search. Seismic Waves. Refracted Seismic Waves and Earth Structure. Reflected Seismic Waves and Earth Structure. Seismic Surveying. Seismic Reflection Data Processing and Interpretation. Gravity on the Earth. Gravity Surveying. Bouguer ...

The Geophysics of Sea Ice

Seeing the Unseen. Geophysics and Landscape Archaeology

Selected Contents: List of lecturers List of students Program of the school Preface Introduction Acknowledgments Theoretical Section Field Work Section Author index Colour plates...

Geophysics for the mineral exploration geoscientist

Providing a balance between principles and practice, this state-of-the-art overview of geophysical methods takes readers from the basic physical phenomena, through the acquisition and processing of data, to the creation of geological models...

Fractal aggregates in geophysics

The combination of small particles to form larger structures is important in a broad range of natural processes, including the flocculation of organic and mineral particles in rivers, estuaries, and the open sea, the growth of smoke particl...

Advances in geophysics

The critically acclaimed serialized review journal for over 50 years, Advances in Geophysics is a highly respected publication in the field of geophysics. Since 1952, each volume has been eagerly awaited, frequently consulted, and praised b...