Detection Seismology: 1. Phase Reversal and Time Delay of Explosion-Generated Surface Waves. 2. Instrument Response of the Kongsberg VLP-System. 3. Unidentified Events Recorded by the Kongsberg VLP-System

1976 ◽  
Author(s):  
Eivind Rygg
Keyword(s):  
Time Delay ◽  
Surface Waves ◽  
Phase Reversal ◽  
Instrument Response

Anomalous surface waves from underground explosions

1979 ◽  
Vol 69 (6) ◽  
pp. 1995-2002 ◽  
Author(s):  
Eivind Rygg
Keyword(s):  
Rayleigh Wave ◽  
Surface Waves ◽  
Rayleigh Waves ◽  
Major Part ◽  
Wave Generation ◽  
Love Waves ◽  
Phase Reversal ◽  
Wave Phase ◽  
Anomalous Surface

abstract The Rayleigh waves at Δ ∼40° from an eastern Kazakh explosion are shown to be polarity reversed and delayed relative to the Rayleigh waves from two other explosions of comparable magnitudes in the same area. The event generating the anomalous Rayleigh waves excited very strong Love waves which were not delayed. The Rayleigh wave phase reversal is shown to be a source phenomenon and it is suggested that in this particular case, spall closure was responsible for a major part of the Rayleigh-wave generation.

scholarly journals Antlions are sensitive to subnanometer amplitude vibrations carried by sand substrates

2018 ◽  
Author(s):  
Vanessa Martinez ◽  
Elise Nowbahari ◽  
David Sillam-Dussès ◽  
Vincent Lorent
Keyword(s):  
Time Delay ◽  
Aggressive Behavior ◽  
Surface Waves ◽  
Aggressive Behaviour ◽  
Piezoelectric Transducers ◽  
Remarkable Feature ◽  
Laser Velocimetry ◽  
Low Level ◽  
Cataglyphis Cursor ◽  
Time Sequences

European pit-building antlions (Myrmeleon inconspicuus / Rambur 1842) are studied in their capacity to detect vibrations generated by the locomotion of an ant (Cataglyphis cursor) outside the pit. These locomotions have been recorded by laser velocimetry and copied in detail in their time sequences. The sequences are replicated by micro-controllers digital outputs acting on piezoelectric transducers placed several centimeters outside the peripheries of the pits: their actions on the surface of a sand media create surface waves with particle accelerations that are 3 orders of magnitude less than g, alleviating any possibility of sand avalanche towards the bottom of the pit. Depending on the amplitude of the vibrations, the antlions answer back, generally by sand tossing. One remarkable feature is the time delay from the start of the cue and the aggressive behavior induced by this cue. This time delay is studied versus the cue amplitude. The result of this work is that anlions answer back within minutes to cues with amplitudes between 1 to 2 nanometers at the level of their mechanosensors, and within seconds to these same cues if they are preceded by a sequence of signals at the Ångström amplitude. This induced aggressive behaviour evidences the sensitivity to vibrations at extremely low level.

Attenuation and Time-Delay Analysis of Surface Waves to Detect Subsurface Tunnels

2017 ◽  
Vol 6 (0) ◽  
pp. 1
Author(s):  
Payman Hajiani ◽  
Neil Anderson ◽  
J. David Rogers
Keyword(s):  
Time Delay ◽  
Surface Waves ◽  
Delay Analysis

Determination and modelling of the formative and statistical time delay in neon

2007 ◽  
Vol 38 (1) ◽  
pp. 73-78 ◽  
Author(s):  
V. Lj. Marković ◽  
S. N. Stamenković ◽  
S. R. Gocić ◽  
S. M. Durić
Keyword(s):  
Time Delay ◽  
Statistical Time

Pulsed discharges produced by surface waves

1998 ◽  
Vol 08 (PR7) ◽  
pp. Pr7-317-Pr7-326 ◽  
Author(s):  
O. A. Ivanov ◽  
A. M. Gorbachev ◽  
V. A. Koldanov ◽  
A. L. Kolisko ◽  
A. L. Vikharev
Keyword(s):  
Surface Waves ◽  
Pulsed Discharges
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