Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground

Details Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground

2006-05-27

arxiv.org/abs/physics/0605239v2

Physics

Classical Physics

Third International Symposium on the Effects of Surface Geology on Seismic Motion, Grenoble, 2006

Scientific paper

When a flat stress-free surface (i.e., the ground in seismological applications) separating air from a isotropic, homogeneous or horizontally-layered, solid substratum is solicited by a SH plane body wave incident in the substratum, the response in the substratum is a single specularly-reflected body wave. When the stress-free condition, equivalent to vanishing surface impedance, is relaxed by the introduction of a {spatially- constant, non- vanishing surface impedance}, the response in the substratum is again a single reflected body wave whose amplitude is less than the one in the situation of a stress-free ground. When the stress-free condition is relaxed by the introduction of a a {spatially-modulated surface impedance}, which simulates the action of an uneven (i.e., not entirely-flat) ground, the frequency-domain response takes the form of a spectrum of {plane body waves} and {surface waves} and {resonances} are produced at the frequencies of which one or several surface wave amplitudes can become large. It is shown, that at resonance, the amplitude of one, or of several, components of the motion on the surface can be amplified with respect to the situation in which the surface impedance is either constant or vanishes. Also, when the solicitation is pulse-like, the integrated time history of the square of surface displacement and of the square of velocity can be larger, and the duration of the signal can be considerably longer, for a spatially-modulated impedance surface than for a constant, or vanishing, impedance surface.

Affiliated with

Also associated with

No associations

Rating

Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplification and Increased Duration of Earthquake Motion on Uneven Stress-Free Ground will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-681245