Abstract: This note addresses the stabilization of a one-dimensional wave equation with control at one end and noncollocated observation at another end. A simple exponentially convergent observer is ...

The wave equation is studied under the effect of a persistent external perturbation. A dynamical distributed controller is suggested, based on an infinite-dimensional generalization of second-order ...

They have demonstrated why earthquake waves change abruptly at a depth of 2,700 kilometres at the so-called D'' layer. The reason for this is a type of solid rock that nevertheless flows. This mineral ...

Only when all the crystals of the mineral point in the same direction in the model are the seismic waves accelerated - as can be observed in the D" layer at a depth of 2700 kilometres. In an unusual ...

Seismic waves accelerate in the D" layer, about 2,700 km deep, due to the alignment of post-perovskite crystals, which occurs as solid mantle rock flows horizontally under extreme pressure and ...

Aug. 9, 2024 — In September 2023, a megatsunami in remote eastern Greenland sent seismic waves around the world, piquing the interest of the global research community.

Seismic observations made thousands of miles away, alongside weather and tidal readings, further enabled the researchers to reconstruct the waves and conclusively link them to the mysterious ...

Fracture development induces seismic anisotropy, which significantly alters wave propagation characteristics (Schoenberg, 1980; Hudson, 1981; Pan et al., 2017). Traditional isotropic reflection ...

This study paves the way for the design of graded seismic metamaterials. This concept allows flexible manipulation of the surface wave propagation by adjusting the graded level, fillers, geometric ...

Get Instant Summarized Text (Gist) Tidal forces induce distinct diurnal, semi-diurnal, and monthly cycles in seismic wave velocity within fault fracture zones, correlating with periodic tidal strain.