Video Experimental Relacionado
Updated: Jun 14, 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
8.4K
Investigando un terremoto megatrust tsunamigénico en la zanja de Japón
Shuichi Kodaira1, Takeshi Iinuma2, Kentaro Imai2
1Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan kodaira@jamstec.go.jp.
Science (New York, N.Y.)
|March 12, 2021
Resumen
El terremoto de Tohoku-oki de 2011 mostró un inesperado deslizamiento de fallas poco profundas en la Fosa del Japón. La actividad y la deformación sísmica posteriores al terremoto continúan, con una baja probabilidad de otro gran terremoto pronto.
Área de la Ciencia:
- Ciencias de la Tierra
- Sismología
- La geofísica
Sus antecedentes:
- La Fosa de Japón es una zona de subducción conocida por terremotos y tsunamis devastadores.
- La placa del Pacífico se subduce debajo de la placa norteamericana en esta región.
- El terremoto de Tohoku-oki de 2011 fue un evento importante con consecuencias significativas.
Objetivo del estudio:
- Para analizar los datos sísmicos, geodésicos y del tsunami del terremoto de Tohoku-oki de 2011.
- Investigar las características del deslizamiento de la falla cosismica, en particular su extensión superficial.
- Para entender la actividad sísmica en curso y la deformación de la corteza en el este de Japón.
Principales métodos:
- Utilizó densas redes de observación sísmica, geodésica y de tsunami.
- Observaciones del fondo marino incorporadas para el registro preciso de eventos.
- Estudios geofísicos marinos aplicados para analizar las variaciones del deslizamiento de fallas.
Principales resultados:
- Documentó un gran deslizamiento de falla cosismica que inesperadamente se extendió a la falla de megatrust poco profunda.
- Se registraron fuertes variaciones laterales en el deslizamiento cosismico cerca de la zanja.
- Se observó una actividad sísmica elevada y una deformación de la corteza en el este de Japón después del terremoto.
Conclusiones:
- El deslizamiento superficial del terremoto de Tohoku-oki de 2011 fue una característica clave del evento.
- Las variaciones laterales en el deslizamiento sugieren controles geológicos específicos cerca de la zanja.
- Si bien es poco probable que se repita un terremoto de magnitud ~9 pronto, un terremoto de falla normal hacia el mar de la zanja es un posible peligro futuro.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:15Elastic Collisions: Case Study
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
01:16Shock Waves
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high pressures...
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...
01:20Microcracking 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...
01:19Vibrating Concrete
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
01:23Investigation of Disease Outbreaks
Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...