Video Experimental Relacionado
Updated: Jul 8, 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
Evidencia sísmica de un manto litosférico indio desprendido debajo del Tíbet
1Institute of the Physics of the Earth, Russian Academy of Sciences, B. Gruzinskaya 10, 128810 Moscow, Russia. GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany. Freie Universität Berlin, Geophysik, Malteser Strasse 74-100, 12249 Berlin, Germany.
Science (New York, N.Y.)
|February 26, 1999
Resumen
Las ondas sísmicas revelan una interfaz de inmersión hacia el norte debajo del Tíbet, lo que sugiere un distinto desprendimiento del manto litosférico entre las placas india y asiática debido a diferencias de composición y flotabilidad.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- La meseta tibetana es el resultado de la colisión continental India-Asia.
- Comprender la estructura litosférica debajo del Tíbet es crucial para la investigación de la tectónica de placas.
Objetivo del estudio:
- Para obtener imágenes de la estructura subterránea debajo de la meseta tibetana utilizando datos sísmicos.
- Para investigar la naturaleza del desprendimiento del manto litosférico.
Principales métodos:
- Análisis de las ondas telesísmicas convertidas de P a S.
- Utilizando datos de redes sísmicas temporales de banda ancha en todo el Tíbet.
Principales resultados:
- Se imaginó una interfaz de inmersión hacia el norte que comienza a 50 km al norte de la sutura de Zangbo a una profundidad de Moho (80 km) y se extiende a 200 km de profundidad debajo de la sutura de Bangong.
- Se observó una estructura segmentada de inmersión hacia el sur debajo del norte del Tíbet.
Conclusiones:
- Las estructuras observadas indican un desprendimiento diferencial de los mantos litosféricos indio y asiático.
- Las variaciones en la composición del manto y la flotabilidad probablemente impulsan estos distintos procesos de desprendimiento.
Videos de Conceptos Relacionados
01:18Fault Types
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
01:23Types of Building Separation Joints
Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200 feet...
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200 feet...
01:12Differential Leveling
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:17Common Leveling Mistakes and Errors
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
01:12Design Example: Marking Boundaries of a Site Using a Compass
Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...