1.
Why is it useful to look at frequency data?
Correct Answer
A. It can be quicker/easier to do certain post-processing functions in the frequency domain.
Explanation
Looking at frequency data is useful because it can make certain post-processing functions quicker and easier to perform. By analyzing data in the frequency domain, we can gain insights into the distribution and power of events, which can be helpful in various applications such as signal processing, image processing, and data compression. This allows for efficient manipulation and analysis of data, leading to improved decision-making and problem-solving in various fields.
2.
Velocity =
Correct Answer
B. Change in distance over change in time (D/T)
Explanation
The correct answer is "Change in distance over change in time (D/T)". Velocity is a measure of how fast an object's position changes over time. It is calculated by dividing the change in distance traveled by the object by the change in time it took to travel that distance. This formula gives us the average velocity of the object.
3.
What is seismic data processing?
Correct Answer
B. Sorting through waveforms collected by geophones and reducing noise, isolating signal, and picking desired frequencies in order to create the best possible image of the subsurface.
Explanation
Seismic data processing involves sorting through waveforms collected by geophones and reducing noise, isolating signal, and picking desired frequencies in order to create the best possible image of the subsurface. This process helps to enhance the quality and clarity of the seismic data, allowing for a more accurate interpretation of the subsurface conditions. It does not involve using a supercomputer to determine material density or playing the data through geophones in a recording studio.
4.
What properties determine how long it takes a sound wave to travel through a material?
Correct Answer
A. Density, and Seismic Velocity.
Explanation
The properties that determine how long it takes a sound wave to travel through a material are density and seismic velocity. Density refers to the mass per unit volume of the material, while seismic velocity refers to the speed at which seismic waves, including sound waves, travel through the material. These two properties are directly related to the ability of a material to transmit sound waves, with higher density and lower seismic velocity resulting in slower sound wave propagation.
5.
How is seismic data collected?
Correct Answer
C. By sending controlled acoustic energy into the Earth and recording the enery transmitted back from different horizons.
Explanation
Seismic data is collected by sending controlled acoustic energy into the Earth and recording the energy transmitted back from different horizons. This method involves creating seismic waves that travel through the Earth's subsurface and are reflected or refracted by different layers or structures. The recorded data is then analyzed to understand the subsurface geology and identify potential oil, gas, or mineral reserves. The other options mentioned, such as using ultrasound or hitting the ground with a hammer, are not accurate methods for collecting seismic data.
6.
What is a Fast Fourier transform?
Correct Answer
B. A rapid algorithm used to convert time data to frequency data.
Explanation
The Fast Fourier Transform (FFT) is a rapid algorithm used to convert time data to frequency data. It is widely used in various fields, including engineering and signal processing, to analyze and manipulate signals in the frequency domain. By applying the FFT, the time-domain data can be transformed into its corresponding frequency components, providing valuable insights into the frequency content of the signal. The FFT is a powerful tool that allows for efficient computation of the discrete Fourier transform, making it essential in many applications where frequency analysis is required.
7.
What is the purpose of doing a seismic survey?
Correct Answer
C. To try and generate an accurate picture of the Earth's subsurface and geologic structure.
Explanation
A seismic survey is conducted to generate an accurate picture of the Earth's subsurface and geologic structure. This is achieved by using seismic waves, which are artificially generated vibrations that travel through the ground. By analyzing the way these waves propagate and reflect off different layers of rock and sediment, geologists can determine the composition, depth, and structure of the subsurface. This information is valuable in various industries, such as oil and gas exploration, mining, and civil engineering, as it helps in locating potential resources, assessing geological hazards, and planning infrastructure projects.