Final answer:
Earthquake magnitudes are measured by the energy released and expressed in numerical values, with the Richter scale being a common method. The felt area is not always the best indicator of magnitude due to varying factors. The US Geological Survey maps help illustrate earthquake locations relative to tectonic plates.
Step-by-step explanation:
Earthquakes are typically quantified according to their energy output, which is measured on a logarithmic scale such as the Richter scale. The magnitude of an earthquake is related to the energy it releases and is represented by numerical values such as 2.1, 5.0, or 6.7. This numerical data can help determine not only the strength but also the potential: destructive effect of an earthquake. However, the felt area is not always the best indicator of the earthquake's magnitude because various factors, including depth, geological conditions, and distance from the epicenter, influence how an earthquake is experienced on the surface.
Understanding Earthquake Effects
The Richter scale is one way to rate earthquakes based on their amplitude and the energy they carry. The US Geological Survey also provides valuable information by mapping recent earthquakes, illustrating the relationship between tectonic plate boundaries and earthquake occurrences. This data aids in understanding the potential impact zones and the necessity of aid during disasters.