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The main difference between geophysics and applied geophysics is the purpose of their research. 

Geophysics: also known as pure geophysics, this field studies the Earth's physical properties and processes to gain information and develop theories.
Applied Geophysics: This field uses the information and methods gained from geophysics to address real-world problems.
Geophysics is used in many industries, including oil and gas, mining, environmental consulting, infrastructure development, and space exploration.

Some applications of geophysics include: 

• Exploration Geophysics: Geophysical methods are used to search for valuable resources in the Earth's crust, such as oil, gas, coal, and minerals.
• Site Characterization: Geophysical services collect data to characterize a site, such as for monitoring electric and magnetic fields.
• Environmental Monitoring: Geophysical data can be used to monitor the environment, such as groundwater, landfills, and plume contamination.

Applied geophysics is used in many fields, including:

• Civil Engineering: Geophysical applications are used in roads, bridges, tunnels, and harbors.
• Archaeology: Geophysical applications are used to characterize sites.
• Geological Hazards: Geophysical applications are used to study landslides, erosion, and karst.