Universal Slow Dynamics in Granular Solids

TenCate, James A.; Smith, Eric; Guyer, R. A.

doi:10.1103/physrevlett.85.1020

Cited by 224 publications

(243 citation statements)

References 18 publications

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“…However, no such longterm recovery is found at sandy gravel site, IBUH03. We note that there are experimental studies using granular solid samples for the recovery according to the logarithm of lapse time as found in these two cases [e.g., TenCate et al, 2000]. Pavlenko and Irikura [2002] showed short-term recovery lasting a few minutes after a strong motion at watersaturated alluvium sites, which is similar to our result at IBUH03.…”

Section: Discussion and Summarysupporting

confidence: 81%

Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement

Sawazaki¹,

Sato²,

Nakahara³

et al. 2006

Geophysical Research Letters

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The spectral ratios of coda waves of local earthquakes have been often used as measures of relative amplification factors of different sites. Applying this method to coda waves registered by seismometers installed on the surface and at the bottom of a borehole, we succeeded in stably measuring the temporal change in site response associated with the occurrence of a large earthquake strong motion. A remarkable drop of coda spectral ratio and a shift of the peak frequency were observed during strong shake at two sites by the 2000 Western Tottori Earthquake and at a site by the 2003 Tokachi‐Oki Earthquake in Japan. The reduction of the peak frequency reached 30–70% at all the sites. After that, the peak frequency logarithmically recovered to the value before the strong motions for a few years at two sites, whereas the other one quickly recovered in a few tens of minutes.

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Section: Discussion and Summarysupporting

confidence: 81%

Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement

Sawazaki¹,

Sato²,

Nakahara³

et al. 2006

Geophysical Research Letters

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“…It should be noted that elasticity of fluid films can be hysteretic (due to different values of G for the motions back and forth in Eq. (10) [8]) and also can provide log time relaxation of parameters that is seen in experiment [10]. This is subject of intense research currently.…”

Section: The Role Oflntergrain Fluidsmentioning

confidence: 99%

The mechanism of strong nonlinear elasticity in earth solids

Ostrovsky¹,

Johnson²,

Shankland³

2000

AIP Conference Proceedings

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“…Recent additional measurements [15] have shown remarkably universal log(time) behavior in these materials.…”

Section: Nonlinear Memow Effects Indicate Anmentioning

confidence: 99%

New nonlinear acoustic techniques for NDE

TenCate

2001

AIP Conference Proceedings

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Abstract. Acoustic nonlinearity in a medium may occur as a result of a variety of mechanisms. Some of the more common nonlinear effects may come from: (1) one or several cracks, volumetrically distributed due to age or fatigue or single disbonds or delamination;(2) imperfect grain-to-grain contacts, e.g., materials like concretes that are "cemented" together and have less than perfect bonds; (3) hard parts in a "soft" matrix, e.g., extreme duty materials like tungsten/copper alloys; or (4) atomic-scale nonlinearities. Nonlinear effects that arise from the first two mechanisms are considerably larger than the last two; thus, we have focused considerable attention on these. The most pervasive nonlinear measure of damage today is a second harmonic measurement.We show that for many cases of interest to NDE, a second harmonic measurement may not be the best choice. We examine the manifestations of nonlinearity in (nonlinear) materials with cracks and/or imperfect bonds and illustrate their applicability to NDE. For example, nonlinear resonance frequency shifts measured at increasing drive levels correlate strongly with the amount of ASR (alkali-silica reaction) damage of concrete cores. Memory effects (slow dynamics) also seem to correlate with the amount of damage.

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Universal Slow Dynamics in Granular Solids

Cited by 224 publications

References 18 publications

Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement

Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement

The mechanism of strong nonlinear elasticity in earth solids

New nonlinear acoustic techniques for NDE

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