Portable, high‐frequency vibrator forh high‐resolution shallow seismic profiling

Nijhof, V.

doi:10.1190/1.1889624

Cited by 11 publications

(6 citation statements)

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“…The other approach is to independently design the core vibration unit. For instance, Nijhof (1989) designed a portable high-frequency electromagnetic seismic vibrator. Tenghamn (2006) designed an electromagnetic seismic vibrator with a flexible shell for marine exploration.…”

Section: Portable Electromagnetic Seismic Vibratormentioning

confidence: 99%

Ground force analysis of a portable electromagnetic seismic vibrator for different surface environments and driving voltages

Chen

Lin

Jiang

et al. 2023

Geophysical Prospecting

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Knowing the actual ground force is important for seismic data processing and seismic vibrator control. However, the weighted-sum method is widely used to estimate the actual ground force in seismic vibrator exploration. Due to the nonideal body of the baseplate and the nonlinear coupling between the baseplate and the ground, the weighted-sum method suffers from estimation error. It is feasible to obtain the actual ground force by using load cells. In previous studies, the effects of different surface environments and driving voltages on the actual ground force were rarely analysed. In this paper, a field experiment was conducted to study the actual ground force of a portable electromagnetic seismic vibrator for different surface environments and driving voltages. The fundamental wave, multiple harmonics, phase distortion, response delay, weighted-sum method estimation error and ground impedance were analysed.The experimental results show that there are obvious second-to-fifth harmonics in the actual ground force. An increase in the driving voltage will enhance the energy ratio of the fundamental wave, suppress the phase distortion and increase the response time of the actual ground force. In a soft soil environment, there are obvious amplitude and phase differences between the weighted-sum ground force and the actual ground force. The phase difference is affected by the driving voltage, which causes a time delay in the cross-correlated wavelet between the weighted-sum ground force and the actual ground force. The ground impedance beneath the baseplate is highly non-linear. As the vibration frequency increases, the viscosity and stiffness of the coupled ground tend to be stable.

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Section: Portable Electromagnetic Seismic Vibratormentioning

confidence: 99%

Ground force analysis of a portable electromagnetic seismic vibrator for different surface environments and driving voltages

Chen

Lin

Jiang

et al. 2023

Geophysical Prospecting

View full text Add to dashboard Cite

show abstract

“…Several such vibrators have been built over the years but have failed to achieve widespread use. During the mid-1990s OYO developed a portable vibrator weighing 70 kg and generating 500 N (122 lbf) at frequencies of between 20 and 1,500 Hz (Nijhof 1989, Nijhof 1990). Haines (2006) mounted a commercially available 'tactile transducer', within a specially made housing, that had a peak power of 400 W over a claimed frequency range of 5 to 800 Hz.…”

Section: The Sourcementioning

confidence: 99%

How to build your own simple, low-cost, seismic system

Dean

Nguyen

Kepic

2018

ASEG Extended Abstracts

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Acquiring seismic data has typically been an expensive pursuit due to the high price of the acquisition systems. Such systems are also typically not easily adaptable to suit different acquisition scenarios. In this paper we detail how you can build your own simple, lowcost (~$60/channel), seismic acquisition system. Data recorded using such systems is comparable to that obtained using a far more expensive commercial seismograph.Seismic sources are similarly expensive with the only low-cost option being a sledgehammer. In this paper we also describe how to manufacture a small vibroseis unit from easily available components at a cost of less than $3,000. This unit has a wider, more controllable, bandwidth than an impact source and can be easily adapted to create a shear wave source for MASW surveys.

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“…During the mid-1990s OYO developed a portable vibrator weighing 70 kg and generating 500 N (122 lbf) at frequencies of between 20 and 1,500 Hz (Nijhof 1989, Nijhof 1990). This unit was used for various experiments giving depth penetrations of up to 50 m, although the minimum frequency employed was 50 Hz ( Matsubara et al 1994( Matsubara et al , 2002Kaida 1995;Kaida et al 1995;Takahashi et al 2000).…”

Section: Introductionmentioning

confidence: 99%

The construction of a simple portable electromagnetic vibrator from commercially available components

Dean

Nguyễn

Kepic

et al. 2018

Geophysical Prospecting

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Since its introduction in the late 1950s, hydraulic vibrators have become the dominant source for land seismic surveys. The hydraulic vibrators typically used for commercial land seismic acquisition, however, are large, costly to operate and expensive to purchase. This inhibits their use for small‐scale and short‐duration surveys as well as Vibroseis research. In this paper we describe, in detail, the construction of a portable vibrator from commercially available components for a cost of less than $US2,000. Data shows that the vibrator is able to successfully transmit sweeps from 15 to 180 Hz with different spectral contents. The vibrator produces a stronger signal than a sledgehammer and we estimate its output to be around 1 kN. The frequency content of the data was concentrated at lower frequencies (<100 Hz) and the ground‐roll was far more energetic than that produced using a sledgehammer.

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Portable, high‐frequency vibrator forh high‐resolution shallow seismic profiling

Cited by 11 publications

References 0 publications

Ground force analysis of a portable electromagnetic seismic vibrator for different surface environments and driving voltages

Ground force analysis of a portable electromagnetic seismic vibrator for different surface environments and driving voltages

How to build your own simple, low-cost, seismic system

The construction of a simple portable electromagnetic vibrator from commercially available components

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