Video Experimental Relacionado
Updated: Jul 9, 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
Un evento secundario de alta frecuencia durante el terremoto de Parkfield de 2004
Bettina P Allmann1, Peter M Shearer
1Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0225, USA. ballmann@ucsd.edu
Science (New York, N.Y.)
|November 24, 2007
Resumen
Los investigadores identificaron un evento sísmico de alta frecuencia durante el terremoto de Parkfield de 2004. Esta explosión de radiación sísmica sugiere un abrupto crecimiento de deslizamiento y proporciona información sobre la dinámica de ruptura de terremotos.
Área de la Ciencia:
- Sismología Sismología Sismología.
- Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos
- La geofísica es la geofísica.
Sus antecedentes:
- El terremoto de Parkfield de 2004 (magnitud 6.0) proporciona valiosos datos sísmicos para el estudio de los procesos de ruptura de los terremotos.
- Comprender la evolución espacial y temporal de la radiación sísmica es crucial para la evaluación del riesgo de terremotos.
Objetivo del estudio:
- Identificar y caracterizar un evento específico de radiación sísmica de alta frecuencia durante el terremoto de Parkfield de 2004.
- Para investigar la relación entre este evento, la distribución del deslizamiento y la velocidad de ruptura.
Principales métodos:
- Se utilizaron registros sísmicos del terremoto de Parkfield en el 2004.
- Empleó un método de retroproyección tridimensional de la forma de onda para obtener imágenes de eventos sísmicos.
- Analizó distintas llegadas sísmicas y realizó inversiones de deslizamiento de largo período.
Principales resultados:
- Se identificó un estallido de radiación sísmica de alta frecuencia a 13 km al noroeste del hipocentro, 5 segundos después del inicio de la ruptura.
- Localizado este evento cerca del borde de una gran mancha de deslizamiento, lo que sugiere un abrupto crecimiento de deslizamiento.
- Se estimó una velocidad de ruptura de 2,5 km/s y se encontró una menor caída de tensión promedio en la parte norte de la ruptura del terremoto.
Conclusiones:
- El evento de alta frecuencia indica una aceleración de deslizamiento localizada y abrupta durante el terremoto de Parkfield.
- Los resultados son consistentes con las estimaciones de caída de estrés de las réplicas, apoyando las variaciones en la caída de estrés a través de la zona de ruptura.
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...
01:03Modes of Standing Waves - I
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
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...
01:15Elastic 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...
01:23Induced Electric Fields
The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
01:11Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...