Earth‐vibrations from dynamite blasts

Leet, L. Don

doi:10.1029/tr010i001p00049

Cited by 3 publications

(3 citation statements)

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“…The C pulses resemble Leet's (1939Leet's ( , 1946 "coupled" waves. They occur at the same place with respect to other types of motion on both Leet's records and those shown here.…”

Section: Dispersed Waves On Ti-ie Longitudinal Componentmentioning

confidence: 89%

Ground vibration near explosions.*

Howell

1949

Bulletin of the Seismological Society of America

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Summary In summary, the following pulses were recognized on many or all of the records taken in the Los Alamitos region: P The first pulse to arrive. P3 A compressional pulse arriving later than P. X1, X2, X3 Three pulses assumed to be body waves traveling along deeper paths than P and P3. C A strongly dispersed pulse largely confined to the longitudinal component. T Motion on the transverse component arriving largely coincident with C. H A direct elliptical motion in a vertical plane. R A Rayleigh-type motion. P, C, H, and R are prominent on all the records, though at distances less than 300 meters from the explosions C, H and R overlap each other, and are not separable. They are strongly dispersed, and their beginnings are therefore difficult to identify. It is the times of arrival of their maxima which are plotted in the travel-time curves. The recorded pulses of energy are all of types previously reported. However, no completely satisfactory theory explaining C, H, or R exists. Any theory describing these pulses must be based on a knowledge of the fundamental properties of the first few meters of the earth's crust, a complicated medium which is plainly neither homogeneous nor elastic. The fact that such a medium can transmit both compressional and Rayleigh-type waves is an encouraging sign, since it means that its behavior can not be radically different from that of elastic substances. It is to be hoped that the mathematical physicists will soon develop equations describing wave transmission through such media. In closing, the author would like to thank the many persons, especially Dr. Beno Gutenberg of the California Institute of Technology and Dr. R. A. Peterson of United Geophysical Company, for their advice and assistance, without which this research could not have been done.

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“…The C pulses resemble Leet's (1939Leet's ( , 1946 "coupled" waves. They occur at the same place with respect to other types of motion on both Leet's records and those shown here.…”

Section: Dispersed Waves On Ti-ie Longitudinal Componentmentioning

confidence: 89%

Ground vibration near explosions.*

Howell

1949

Bulletin of the Seismological Society of America

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“…The distinction between Rayleigh and Love waves breaks down in anisotropic media and a generalized surface is propagated with elliptic particle motion in a vertical plane inclined to the direction of propagation. Coupled waves with such motion were first reported by Leet (1939) from records of explosions in unconsolidated material. Individual grains are usually anisotropic and mechanisms such as magnetic alignment may result in unconsolidated materials showing anisotropy.…”

Section: Anisotropy In the Earthmentioning

confidence: 92%

Coupled Rayleigh-Love Second Modes

Crampin¹

1967

Geophys J Int

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Second-mode seismic wave trains along many paths in Eurasia are observed to have a phase relationship between the vertical motion and the transverse horizontal motion which cannot exist for elastic waves in isotropic layered media. These coupled, or generalized, surface waves are caused by an anisotropic layer immediately beneath the crust. It is suggested that this anisotropy is the result of orientation of crystalline mantle material by convection currents. 229 1

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“…It has long been realized that the motion of the ground near an explosion is a complicated mixture of various surface and body waves. These waves have been studied by LEET [1939], who observed several types of motion which were not readily correctable with the waves predicted by theory. One of the types described by Leet consisted of in-phase mo tion observed on three orthogonal recording components.…”

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confidence: 99%

Dispersion of seismic waves near a small explosion

Keller

1955

Eos Trans. AGU

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The characteristics of the ground vibrations caused by the detonation of small dynamite charges were studied at distances from ten to 3070 ft from the point of detonation. The motion which was observed could be separated into several types on the basis of velocity and particle motion paths. The major part of the recorded motion following the arrival of body waves exhibited strong dispersion. A comparison of this dispersion with that theoretically predicted for Rayleigh waves by Love, Sezawa, and others, showed that these motions are probably Rayleigh waves of the first and second types. The complex particle motion orbits observed near the shot point are probably a result of the overlap of these two normal modes of surface wave propagation.

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Earth‐vibrations from dynamite blasts

Cited by 3 publications

References 0 publications

Ground vibration near explosions.*

Ground vibration near explosions.*

Coupled Rayleigh-Love Second Modes

Dispersion of seismic waves near a small explosion

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