Transposition of foliations and superposition of lineations during polyphase deformation in the Nevado-Filabride complex: tectonic implications     

Ruiz-Fuentes  Alejandro  Aerden  Domingo G. A. M. 《International Journal of Earth Sciences》2018,107(6):1975-1988

International Journal of Earth Sciences - Detailed structural analysis in a ca. 80 km2 area of the western Nevado-Filabride complex (Betic Cordillera) reveals a heterogeneous internal...  相似文献   

Tectonics may affect closed watersheds used to monitor climate change and human activity effects     

Alejandro Jiménez-Bonilla  Manuel Díaz-Azpiroz  Miguel Rodríguez Rodríguez 《地学学报》2023,35(1):58-65

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Nonlinear modelling of the seismic response of masonry structures: Calibration strategies     

D’Altri  Antonio Maria  Cannizzaro  Francesco  Petracca  Massimo  Talledo  Diego Alejandro 《Bulletin of Earthquake Engineering》2022,20(4):1999-2043

Bulletin of Earthquake Engineering - In this paper, a simple and practitioners-friendly calibration strategy to consistently link target panel-scale mechanical properties (that can be found in...  相似文献   

Geotechnical zonation and soil–structure interaction at Puerto Vallarta,México     

Escudero  Christian R.  Ramirez Gaytan  Alejandro  Zamora Camacho  Araceli  Preciado  Adolfo  Flores  Karen L.  Gomez Hernandez  Adan 《Natural Hazards》2022,110(1):247-267

Natural Hazards - We performed a seismic vulnerability assessment that involves geotechnical and building structure analysis for Puerto Vallarta, Mexico, a city located along the pacific coast....  相似文献   

Typology of Municipal Wastewater Treatment Technologies in Latin America     

Adalberto Noyola  Alejandro Padilla‐Rivera  Juan Manuel Morgan‐Sagastume  Leonor Patricia Güereca  Flor Hernández‐Padilla 《洁净——土壤、空气、水》2012,40(9):926-932

This paper presents an analysis of the wastewater treatment plants in six Latin American and Caribbean countries. Based on a sample of 2734 municipal treatment facilities, the applied processes are classified by sizes (influent flow) and type of technologies. The distribution of the technologies is also presented for each of the six countries. In addition, a representative municipal wastewater characterization, based on influent data from 174 treatment plants, is proposed. Results show that stabilization ponds, activated sludge, and the upflow anaerobic sludge blanket reactors represent 80% of the treatment facilities of the sample, providing treatment to 81% of the total flow considered. Moreover, 67% of the plants in the sample are small (flow <25 L/s) and the very small facilities (influent flow <5 L/s) are extensively applied in the region (34% of the sample), especially in Mexico and Brazil. The use of very small treatment plants may result in low energy efficiency systems and on possible incompliance of the discharge standards. This common practice in several countries in Latin America should be revised in order to improve the environmental performance of such facilities.  相似文献   

Parameters of Higuchi’s method to characterize primary waves in some seismograms from the Mexican subduction zone     

Gonzalo Gálvez-Coyt  Alejandro Mu?oz-Diosdado  José A. Peralta  José A. Balderas-López  Fernando Angulo-Brown 《Acta Geophysica》2012,60(3):910-927

Higuchi’s method is a procedure that, if applied appropriately, can determine in a reliable way the fractal dimension D of time series; this fractal dimension permits to characterize the degree of correlation of the series. However, when analyzing some time series with Higuchi’s method, there are oscillations at the right-hand side of the graph, which can cause a mistaken determination of the fractal dimension. In this work, an appropriate explanation is given to this type of behaviour. Using the seismogram as a time series and the properties of the P and S waves, it is possible to use the properties of Higuchi’s method to previously detect the arrival of the earthquake shacking stage, some seconds in advance, approximately 30–35 s in the case of Mexico City. Thus, we propose the Higuchi’s method to characterize and detect the P waves in order to estimate the strength of the forthcoming S waves.  相似文献   

Non-extensivity analysis of seismicity within four subduction regions in Mexico     

Sharon M. Valverde-Esparza  Alejandro Ramírez-Rojas  E. Leticia Flores-Márquez  Luciano Telesca 《Acta Geophysica》2012,60(3):833-845

The non-extensivity approach based on the Tsallis entropy has been applied to seismicity that occurred from 1988 to 2010 along the Mexican South Pacific coast. We analyzed four different regions, characterized by different subduction patterns. Our results indicate a possible correlation between the non-extensive parameters and the seismicity pattern associated with the inclination angle of each subduction region.  相似文献   

Effect of simultaneous state–parameter estimation and forcing uncertainties on root-zone soil moisture for dynamic vegetation using EnKF     

Alejandro Monsivais-Huertero  Wendy D. Graham  Jasmeet Judge  Divya Agrawal 《Advances in water resources》2010

In this study, an EnKF-based assimilation algorithm was implemented to estimate root-zone soil moisture (RZSM) using the coupled LSP–DSSAT model during a growing season of corn. Experiments using both synthetic and field observations were conducted to understand effects of simultaneous state–parameter estimation, spatial and temporal update frequency, and forcing uncertainties on RZSM estimates. Estimating the state–parameters simultaneously with every 3-day assimilation of volumetric soil moisture (VSM) observations at 5 depths lowered the average standard deviation (ASD) and the root mean square error (RMSE) for RZSM by approximately 1.77% VSM (78%) and 2.18% VSM (93%), respectively, compared to the open-loop ASD where as estimating only states lowered the ASD by approximately 1.26% VSM (56%) and the RMSE by 1.66% VSM (71%). The synthetic case obtained RZSM estimates closer to the observations than the MicroWEX-2 case, particularly after precipitation/irrigation events. The differences in EnKF performance between MicroWEX-2 and synthetic observations may indicate other sources of errors in addition to those in parameters and forcings, such as errors in model biophysics.  相似文献   

Prospects of solar axion searches with crystal detectors     

S. Cebrin  E. García  D. Gonzlez  I. G. Irastorza  A. Morales  J. Morales  A. Ortiz de Solrzano  J. Puimedn  A. Salinas  M. L. Sarsa  S. Scopel  J. A. Villar 《Astroparticle Physics》1999,10(4):397-404

A calculation of the expected signal due to Primakoff coherent conversion of solar axions into photons via Bragg scattering in several crystal detectors is presented. The results are confronted with the experimental sensitivities of present and future experiments concluding that the sensitivity of crystal detectors does not challenge the globular cluster limit on the axion-photon coupling g_aγγ. In particular, in the axion mass window m_a 0.03 eV explored with this technique (not accessible at present by other methods), g_aγγ might be constrained down to 10⁻⁹ GeV⁻¹ (the recent helioseismological bound) provided that significant improvements in the parameters and performances of these detectors be achieved and large statistics accumulated. This bound should be considered as a minimal goal for the sensitivity of future crystal experiments. Consequently, finding a positive signal at this level of sensitivity would necessarily imply revisiting other more stringent astrophysical limits derived for the same range of m_a values.  相似文献   

Modelling the influence of snow accumulation and snow-ice formation on the seasonal cycle of the Antarctic sea-ice cover   总被引：5，自引：5，他引：0  

T. Fichefet  M. A. Morales Maqueda 《Climate Dynamics》1999,15(4):251-268

 Recent observational and numerical studies of the maritime snow cover in the Antarctic suggest that snow on top of sea ice plays a major role in shaping the seasonal growth and decay of the ice pack in the Southern Ocean. Here, we make a quantitative assessment of the importance of snow accumulation in controlling the seasonal cycle of the ice cover with a coupled snow–sea-ice–upper-ocean model. The model takes into account snow and ice sublimation and snow deposition by condensation. A parametrisation of the formation of snow ice (ice resulting from the freezing of a mixture of snow and seawater produced by flooding of the ice floes) is also included. Experiments on the sensitivity of the snow–sea-ice system to variations in the sublimation/condensation rate, the precipitation rate, and the amount of snowfall transported by the wind into leads are discussed. Although we focus on the model response in the Southern Hemisphere, results for the Arctic are also discussed in some cases to highlight the relative importance of the processes under study in both hemispheres. It is found that the snow loss by sublimation can account for the removal of 0.45 m of snow per year in the Antarctic and that this loss significantly affects the total volume of snow ice. A precipitation decrease of 50% is conducive to large reductions in the Antarctic snow and snow-ice volumes, but it leads only to an 8% decrease in the annual mean ice volume. The Southern Ocean ice pack is more sensitive to increases in precipitation. For precipitation rates 1.5 times larger than the control ones, the annual mean snow, ice, and snow-ice volumes augment by 30, 20, and 180%, respectively. It is also found that the transfer to the ocean of as much as 50% of the precipitating snow as a result of wind transport has almost negligible effects on the total ice volume. All the experiments exhibit a marked geographical contrast in the ice-cover response, with a much larger sensitivity in the western sector of the Southern Ocean than in the eastern sector. Our results suggest that snow-related processes are of secondary importance for determining the sensitivity of the Arctic sea ice to environmental changes but that these processes could have an important part to play in the response of the Antarctic sea-ice cover to future, or current, climatic changes. Received: 30 June 1997/Accepted: 2 October 1998  相似文献