... for the evaluation of steel plate thicknesses; however, they lack energy for penetrating a Portland cement grout in contact with a steel wall to detect debonding conditions. In this work, a joint analysis of surface waves and Lamb waves (high and low frequency) is used for the detection of debonding conditions...

... included a Lamb wave containing periods at least up to 2000 s. The Lamb wave and tsunami are well recorded on infrasound and near‐shore seismometers. The air wave generated a precursor tsunami ahead of the main tsunami, but we do not observe it on the hydroacoustic IMS network. The dispersive tail...

... excited the atmospheric Lamb and Pekeris waves and accompanying sea‐surface disturbances, and the coupled atmospheric and sea‐surface disturbances traveled worldwide. To understand the propagation characteristics of sea‐surface disturbances in an atmosphere‐ocean coupled system, we applied wave...

... directions more nearly north–south than those of the leading disturbances at the coast of southwestern Japan. These results indicate that the pressure disturbances recorded at the OBPG arrays propagated as tsunamis rather than sea‐surface disturbances excited by atmospheric Lamb waves, although atmospheric...

... eruption produced acoustic gravity waves that were recorded globally. For example, the Lamb wave from this eruption produced early‐arriving and long‐lasting tsunami waves. This eruption also provided globally recorded coupling of atmospheric modes with solid Earth modes, providing another example...

... multiple reflections, as well as interference from the primary zero-order antisymmetric Lamb wave (A 0 ). We develop a two-step method to enhance and accurately pick the TIE arrivals. We first use mathematical morphological filtering with a neural network framework to mitigate the influence of A 0...

...Ruolong Song; Hefeng Dong; Xueshan Bao ABSTRACT Cement-bond evaluation is needed for new wells and plug and abandonment activities. The ultrasonic leaky Lamb-wave (also called the flexural-wave) technique, in combination with the pulse-echo technique, has been widely used for cement-quality...

... vector. We discuss the general solution of equations of motion. This solution describes the following wave types: longitudinal and transverse bulk waves, Rayleigh wave, surface transverse wave in a half-space as well as Lamb wave and transverse wave in a thin layer. Within the framework of Cosserat...

...Figure 7. Schematic overview of the interaction between leaky Lamb wave packets on two parallel pipes, as seen in Figure  2e . Arrows show the influence from earlier wave packets on later ones. ...

.... The superimposed elastic energy from swell‐triggered sources illuminates the shelf interior as extensional (elastic plate) Lamb waves that are observable more than 100 km from the ice edge. Seismic swarms show threshold excitation and hysteresis with respect to rising and falling swell excitation. This behavior...

...Klaus Schiel; João S. Protázio Abstract An exact analytic solution of Lamb's problem is presented with no approximation or restriction for material parameters or source observer geometries. The transient-wave field for a directional point force normal to the surface of an elastic half-space...

... the cement sheath and the formation. Previous studies revealed that the properties of leaky Lamb waves are sensitive to the mechanical features of interfaces in multilayered media ( Rose, 1999 ). Hence, such guided waves have been used in the nondestructive detection for the concealed debonding...