Seismic velocity structure

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/seismic-velocity-structure

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary data source?Analysis of seismic wave propagation characteristics (speed, travel time, amplitude)
2. What is the influencing factors?Elastic moduli, density, temperature, pressure, fluid content, and phase
3. Why do seismic waves travel faster in some parts of the Earth?Faster speeds usually mean the material is denser, cooler, and more rigid, like solid rock.
4. How do scientists learn about the Earth's layers using seismic waves?They listen to waves from earthquakes or artificial sources, measure how long they take, and use computers to build a 3D picture, similar to a medical CT scan.

Elastic Moduli: Measures of a material's resistance to deformation under stress.
Seismic Tomography: A technique to create 3D images of Earth's interior using seismic wave data.
Full-Waveform Inversion (FWI): An advanced method that uses the entire seismic wave signal to image subsurface structures.