Effects of fracture scale length and aperture on seismic waves: An experimental study

2007 ◽  
Author(s):  
Jianxin Wei ◽  
Bangrang Di ◽  
Xiang‐Yang Li
Keyword(s):  
Experimental Study ◽  
Seismic Waves ◽  
Fracture Scale ◽  
Scale Length

Experimental study of laser beam transmission and power accounting in a large scale length laser plasma

2000 ◽  
Vol 7 (8) ◽  
pp. 3388-3398 ◽  
Author(s):  
J. D. Moody ◽  
B. J. MacGowan ◽  
R. L. Berger ◽  
K. G. Estabrook ◽  
S. H. Glenzer ◽  
...  
Keyword(s):  
Experimental Study ◽  
Laser Beam ◽  
Laser Plasma ◽  
Large Scale ◽  
Beam Transmission ◽  
Scale Length

scholarly journals The variations of characteristic scale length of friction evolution affect earthquake dynamics

2021 ◽  
Vol 64 (2) ◽  
Author(s):  
Andrea Bizzarri
Keyword(s):  
Seismic Waves ◽  
Temporal Variations ◽  
Friction Model ◽  
Analytical Models ◽  
Physical Parameters ◽  
Characteristic Scale ◽  
Earthquake Dynamics ◽  
Stable Regime ◽  
Event Time ◽  
Scale Length

Within a fault governing model the characteristic scale length is one of the most relevant physical parameters because it accounts for the so–called fracture energy (density) of the system, its dynamics, the time during which the accumulated stress is released and the seismic waves are excited, the amount of slip developed during an instability event. Friction laboratory experiments reveal that it is not a material property, but that it changes with the sliding velocity. We propose two rather different analytical models to fit laboratory evidence and we incorporate them into a fault model able to simulate repeated earthquakes in the framework of various formulations of rate and state friction. We demonstrate that temporal variations of the scale length do not prevent the system to reach its limit cycle, but they systematically reduce the magnitude of the expected event (both in term of developed slip, and thus seismic moment, and released stress) and also reduce the inter–event time (recurrence interval). Depending on the friction model, the system can penetrate into the stable regime and can either continue the accelerating phase toward to failure or decelerate and abort instability.

scholarly journals Experimental study on the effect of fracture scale on seismic wave characteristics

2008 ◽  
Vol 5 (2) ◽  
pp. 119-125 ◽  
Author(s):  
Jianxin Wei ◽  
Bangrang Di ◽  
Qiang Wang
Keyword(s):  
Experimental Study ◽  
Seismic Wave ◽  
Wave Characteristics ◽  
Fracture Scale

Experimental study of fracture scale effect on P-wave velocity, amplitude and anisotropy

2016 ◽  
Author(s):  
Da Shuai ◽  
Jianxin Wei ◽  
Bangrang Di ◽  
Pinbo Ding ◽  
Wenpeng Si ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wave Velocity ◽  
Scale Effect ◽  
P Wave ◽  
Velocity Amplitude ◽  
P Wave Velocity ◽  
Fracture Scale

Experimental Study on Dynamic Characteristics and Seismic Response Analysis of Yingxian Wooden Pagoda

2012 ◽  
Vol 433-440 ◽  
pp. 6077-6083
Author(s):  
Xu Yan ◽  
Tie Ying Li
Keyword(s):  
Experimental Study ◽  
Transfer Function ◽  
Function Method ◽  
Seismic Waves ◽  
Response Analysis ◽  
Vibration Modes ◽  
Test Results ◽  
Seismic Response Analysis ◽  
Horizontal Vibration ◽  
Transfer Function Method

In order to have a better understanding of the vibration characteristics, micro tremor measurements are carried out on Yingxian Wooden pagoda. Horizontal vibration modes of the tower and the torsional vibration modes on each floor are attained by analysis of the test results. Based on transfer function method, elastic displacements of the tower under the different seismic waves are derived. Trough theoretical analysis, the significative conclusions are received as a basis for researching and protecting the ancient building.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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