Video Experimental Relacionado
Updated: Jul 12, 2026

06:55
Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
Conciliando cortos intervalos de recurrencia con deformaciones menores en la nueva zona sísmica de Madrid
Resumen
La zona sísmica de Nueva Madrid experimentó grandes terremotos entre 1811 y 1812. A pesar de la evidencia de frecuentes grandes terremotos, la falta de deformación significativa de la corteza sugiere que esta zona sísmica es geológicamente joven.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- La zona sísmica de Nueva Madrid (NMSZ) es conocida por grandes terremotos históricos, incluidos tres en 1811-1812.
- Las estimaciones actuales de la tasa de deformación y los datos paleosismológicos sugieren un intervalo de repetición de 1000 años o menos para los grandes terremotos en la NMSZ.
- Los eventos de licuefacción del suelo en los últimos 5000 años apoyan aún más una historia de actividad sísmica significativa.
Objetivo del estudio:
- Para conciliar la evidencia histórica y paleosismológica de frecuentes grandes terremotos con la observada falta de deformación penetrante de la corteza en el NMSZ.
- Para investigar la edad y las características tectónicas de la zona sísmica de Nuevo Madrid.
Principales métodos:
- Análisis de las tasas de deformación actuales.
- Interpretación de datos paleosismológicos, incluida la evidencia de la licuefacción del suelo.
- Evaluación geológica para evaluar los patrones de deformación de la corteza.
Principales resultados:
- Los datos paleosismológicos indican que los terremotos que causan la licuefacción del suelo han ocurrido varias veces en los últimos 5000 años.
- Las estimaciones de las tasas de deformación sugieren un tiempo de repetición de 1000 años o menos para los grandes terremotos.
- La deformación de la corteza observada no es generalizada, contrariamente a las expectativas para una zona sísmica madura y frecuentemente activa.
Conclusiones:
- La limitada deformación de la corteza en la zona sísmica de Nuevo Madrid sugiere que se trata de una característica geológicamente joven.
- La edad de la zona sísmica se estima en el rango de decenas de miles a unos pocos millones de años.
- Este hallazgo tiene implicaciones para la comprensión de los peligros sísmicos y la evolución tectónica en la región.
Videos de Conceptos Relacionados
Adjusting a Traverse
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
Creep in Concrete
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
Residual Stresses
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
Expansion and Contraction in Masonry Walls
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
To...
Residual Stresses in Bending
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
Microcracking in Concrete
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
