Some new passive and active methods for reducing the effects of seismic disturbances on suspended masses are described, with special reference to gravitational radiation detectors in which differential horizontal motions of two or more suspended test masses are monitored. In these methods it is important to be able to determine horizontal seismic accelerations independent of tilts of the ground...

This paper proposes a design method of tracking control for electric shaking tables via the stochastic optimal control theory with preview action based on a third-order model with respect to the jerk, acceleration, velocity and displacement of the table. The reaction force caused by the dynamic motion of a test structure subjected to seismic disturbances can be regarded as a random disturbance ...

Information can be conveyed as visual, tactile, vocal, olfactory or seismic signals (e.g. 5, 7, 9, 10). Different signalling modalities are present in different species, depending upon their sensory capacity and the environment where they evolved (1). For example, in a noisy environment visual display can have higher importance, while in nocturnal animals, animals that live in an environment wi...

In order to solve the geophysics inverse problem, the artificial neural networks of Elmen type were trained to extract acoustic parameters from seismic trace. This type of network offers an advantage of training simplicity by the Backpropagation conjugate gradient algorithm. The networks behaviour observed on training data is very close to the one observed on test data. The efficiency of these ...

Weak values arise experimentally as conditioned averages of weak (noisy) observable measurements that minimally disturb an initial quantum state, and also as dynamical variables for reduced quantum state evolution even in the absence of measurement. These averages can exceed the eigenvalue range of the observable ostensibly being estimated, which has prompted considerable debate regarding their...

Over the past decade, widespread disturbance has brought a large amount of narrow-linear and small-area disturbance features (e.g., ATV trails, seismic lines, pipelines/powerlines, well sites, forest roads and cut blocks) to forest areas in the Foothills Region of Alberta, Canada. This issue has prompted research into finding appropriate data and methods for mapping these narrow-linear and smal...

We propose a method for decomposing a seismic record into atomic events defined by a smooth phase and a smooth amplitude. The method uses an iterative refinement-expansion tracking scheme to minimize the highly nonconvex objective function. We demonstrate the proposed method on a noisy synthetic record from the shallow Marmousi model. Finally, we show an application of our method to low frequen...