physics

Seismic vibrator

Seismic vibrator is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Seismic vibrator rather than just read about it. In short: A seismic vibrator is a truck-mounted or buggy-mounted device that is capable of injecting low-frequency vibrations into the earth. It is one of a number of seismic sources used in reflection seismology.

Key takeaways

Seismic vibrator belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Seismic vibrator to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Seismic vibrator from memory before moving on to harder problems.

Reference excerpt

A seismic vibrator is a truck-mounted or buggy-mounted device that is capable of injecting low-frequency vibrations into the earth. It is one of a number of seismic sources used in reflection seismology. The ‘Vibroseis’ exploration technique (performed with vibrators) was developed by the Continental Oil Company (Conoco) during the 1950s and was a trademark until the company's patent lapsed. Today, seismic vibrators are used to perform about half of all seismic surveys on land. The largest seismic vibration truck in the world, known as 'Nomad 90’, weighs 41.5T and has a 90,000 lbf force.

Principle A seismic vibrator transforms the energy provided by a diesel engine into a vibration. It is performed by a shaker, a movable element that generates the vibration thanks to a piston-reaction mass device driven by an electrohydraulic servo valve. The shaker is applied to the ground for each vibration, then raised up so that the seismic vibrator can move to another vibrating point. Vibrator capability is defined by the maximum force it is capable to generate, called High Peak Force and measured in pound-force. To transmit a maximum force to the ground and prevent the shaker from bumping, part of the weight of the vibrator is applied to the shaker. The vibration frequency typically ranges between 20–150 Hz.

Popular culture The plot of Ken Follett's 1998 thriller The Hammer of Eden turns on the use of a stolen seismic vibrator truck by ecoterrorists.

References

Industrial Vehicles International is a manufacturer of Seismic Vibrators

External links

Seismic Research at the KGS, description of seismic vibrator and how the Kansas Geological Survey uses it Alaska Department of Fish and Game, image of a vibroseis in use Geosys IVI Archived 2004-10-22 at the Wayback Machine Pictures and descriptions of seismic vibrators manufactured by Geosys, Inc. of Japan Vibrator truck Archived 2011-09-30 at the Wayback Machine Images of a vibrator trucks used by the University of Calgary

Illustrations

Worked examples

Example 1 — a first encounter with Seismic vibrator

Start with the simplest possible case. Write down what Seismic vibrator claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Seismic vibrator before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Seismic vibrator ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Seismic vibrator

In research: Seismic vibrator appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Seismic vibrator in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Seismic vibrator is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geological tools, Geophysics stubs, Seismology, so understanding it makes those chapters shorter.
In everyday life: Look for Seismic vibrator outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Seismic vibrator in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Seismic vibrator means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Seismic vibrator out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Seismic vibrator in simple terms?

Why does Seismic vibrator matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Seismic vibrator?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Seismic vibrator.