Results 71 to 80 of about 306,561 (318)

Lethality level casualty assessment method for earthquake landslide hazards based on the expansion effect of the mortality rate

Scientific Reports
Rapid assessment of earthquake disaster losses is crucial for effective emergency rescue operations, with post-earthquake geological hazards constituting a significant component.
Xia Chaoxu, Qi Wenhua, Li Huayue, Nie Gaozhong   +3 more
doaj   +1 more source

基于等效磁荷法的地磁观测仓体磁场分布

Dizhen xuebao
利用等效磁荷方法计算了非轴向磁化圆柱形有底仓体表面的磁荷密度分布和仓内的磁场分布，并与计算机仿真和实测结果进行了对比，结果显示其相对差值＜0.001%。在此基础上，利用该方法计算了无底仓体及不同底部厚度、高度、直径、磁化率的仓体的内部磁场梯度分布情况。结果表明：仓体底部厚度和磁化率对仓体内部磁场梯度的影响较小，增大仓体高度和直径可有效地增加内部的低磁场梯度空间，当仓体内高≥4 m、仓体内径≥1.0 m时，仓体内部水平方向和垂直方向的有效空间占比平均在85%以上。
Yuxin Guo, Xiuxia Zhang, Qian Zhang, Xiwei Gao, Yu Li   +4 more
doaj   +1 more source

Seismic Networks

, 2000
New Manual of Seismological Observatory Practice 2 (NMSOP2)
Trnkoczy, A., Havskov, J., Ottemöller, L., Bormann, P.   +3 more
openaire   +4 more sources

Seismic attenuation in Faroe Islands basalts

We analysed vertical seismic profiling (VSP) data from two boreholes at Glyvursnes and Vestmanna on the island of Streymoy, Faroe Islands, to determine the magnitude and causes of seismic attenuation in sequences of basalt flows.
Worthington, M. H., Andersen, M. S., White, R. S., Shaw, F., Group, Seifaba, Petersen, U. K.   +5 more
core   +1 more source

Semi‐analytical solution for the stability of deep vertical shaft considering time‐dependent rock‐structure interaction

Deep Underground Science and Engineering, EarlyView.
A novel cavity contraction solution and multilayer shaft wall model were developed to analyze deep shaft stability, considering rock viscosity, support structures, and water pressure, with successful validation through a Hulusu Coal Mine case study.
Bin Chen, Pinqiang Mo, Zhao Lu, Lianfei Kuang, Qiang Zhang, Abolfazl Eslami   +5 more
wiley   +1 more source

Numerical and experimental study on P‐wave propagation across a rock joint with different orientations

Deep Underground Science and Engineering, EarlyView.
Joint orientation significantly affects P‐wave velocity, with the highest velocity at zero‐degree angles, decreasing to 30° as the angle increases. The velocity increases slightly from 30 to 45 degrees but sharply decreases from 45 to 90 degrees. Abstract Determination of the required parameters in different science contexts using the ultrasonic wave ...
Yaghoob Zarei, Mojtaba D. fallahi, Ali Uromeihy, Mohammad R. Nikoodel, Mohammad Fathollahy   +4 more
wiley   +1 more source

Petrophysical seismic inversion based on lithofacies classification to enhance reservoir properties estimation: a machine learning approach

Journal of Petroleum Exploration and Production Technology, 2020
For estimation of petrophysical properties in industry, we are looking for a methodology which results in more accurate outcome and also can be validated by means of some quality control steps.
Amir Abbas Babasafari, Shiba Rezaei, Ahmed Mohamed Ahmed Salim, Sayed Hesammoddin Kazemeini, Deva Prasad Ghosh   +4 more
doaj   +1 more source

Time-lapse seismic attenuation as a tool for monitoring hydrocarbons and CO2 in geological materials [PDF]

, 2011
Both laboratory experiments and theoretical models have shown seismic attenuation to be sensitive to various petrophysical properties of rock and pore fluids, making attenuation a potentially useful time-lapse attribute to measure and interpret through ...
Blanchard, Thomas David
core  

Gaborlet‐guided sparse filtering: A novel intelligent method for lithology identification by vibration signals while drilling

Deep Underground Science and Engineering, EarlyView.
The flowchart illustrates rock specimen testing, vibration signal acquisition, and feature extraction with Gaborlet and sparse filtering for classification. Abstract Traditional lithology identification methods mainly rely on core sampling and well‐logging data.
Jian Hao, Danqi Zhang, Zhenqi Song, Jinrui Wang, Qi Wang, Heqing Liu   +5 more
wiley   +1 more source

Seismic Evaluation and Retrofit of Concrete Buildings Volume 1

, 1996
Buku ini terdiri atas dua volume, dimana volume pertama membahas tentang bagian-bagian utama dari metodologi evaluasi dan retrofit. Buku akan membantu pembaca untuk memahami bagaimana melakukan evaluasi seismik terhadap bangunan.xix, 317 p. : ill. ; 28,5
Seismic Safety Commission, Comartin, Craig D.   +1 more
core