What is seismic tomography used for?
Seismic tomography is a powerful method to image the earth’s interior in three dimensions using seismic waves from natural earthquakes recorded at stations located at or near the surface around the world. It is an ill-posed inverse problem constrained by the available distribution of earthquakes and recording stations.
What is seismic reflection tomography?
1. n. [Geophysics] A technique to measure and display the three-dimensional distribution of velocity or reflectivity of a volume of the Earth by using numerous sources and receivers at the Earth’s surface.
What is surface wave tomography?
Surface wave tomography (SWT) is a well-established technique used at the regional/global scale to image crustal and upper mantle structures using surface waves produced by strong earthquakes at large distances.
Is seismic tomography similar to medical imaging?
Seismic tomography is a direct way of detecting these variations. It is a technique similar to those used in medical imaging (e.g. CAT scan) except that the energy source comes from earthquakes instead of a controlled source such as x-rays in the case of CAT scans.
What are the limitations of seismic tomography?
What are the limitations of seismic tomography? Global seismic tomography is limited by the irregularity in time and space of the source, and by the incomplete coverage of recording stations. The primary source is earthquakes, which are impossible to predict and only occur at certain locations around the world.
How is a CT scan like seismic tomography?
Both techniques have an energy source (seismic tomography uses the energy generated from earthquakes; CAT scans use x-ray energy) and a receiver (seismic tomography uses seismograph stations; CAT scans use comtuters) that records the data.
What’s the most likely interpretation of the red area in the seismic tomography data?
What’s the most likely interpretation of the red area in the seismic tomography data? It’s a thermal mantle plume.
Who invented seismic tomography?
The real breakthrough in body wave tomography occurred during 1974–1977 when Keiti Aki, a professor at the Massachusetts Institute of Technology, along with Anders Christoffersson of the University of Uppsala, Sweden, and Eystein Husebye of the Norwegian Seismic Array (NORSAR), Norway, developed an inversion technique …
What is the difference between seismic reflection and refraction?
In this sense, reflection method is a very sophisticated version of the echosounding used in submarines, ships, and radar systems. Whereas, in seismic refraction method, principal portion of the wave-path is along the interface between the two layers and hence approximately horizontal.
What are the advantages and disadvantages of seismic reflection data sets?
Advantages and Disadvantages of Seismic Methods
| Seismic Methods | |
|---|---|
| Advantage | Disadvantage |
| Can be used to delineate stratigraphic and, in some instances, depositional features. | Data reduction and processing can be time consuming, require sophisticated computer hardware, and demand considerable expertise. |
What is the difference between refraction and reflection of seismic waves?
In reflection, the waves bounce off the surface. On the contrary, in refraction, the waves pass through the surface, that changes their speed and direction.
What is the difference between reflection and refraction of seismic waves?
Key Differences Between Reflection and Refraction The reverting of light or sound waves in the same medium, when it falls on the plane, is called reflection. The shift in the direction of the radio waves, when it enters medium with different density, is known as refraction.
What is the difference between total internal reflection and refraction?
The key difference between total internal reflection and refraction is that total internal reflection is the complete underwater appearance with no loss of brightness, whereas refraction is the change in the direction of a wave that is passing from one medium to another.
What does a geophone measure?
A geophone is a device that converts ground movement (velocity) into voltage, which may be recorded at a recording station. The deviation of this measured voltage from the base line is called the seismic response and is analyzed for structure of the earth.