Smartphones can be used as early warning systems for earthquakes

The video explains how ground movement during earthquakes can be detected and used to issue warnings, especially for earthquakes with a magnitude of 7 or greater. It highlights the role of crowdsourcing, where a small percentage of people in an area can contribute information via their smartphones to provide early warnings.

What is the primary capability discussed in the first section regarding earthquakes?

• Preventing earthquakes from occurring

• Detecting ground movement during an earthquake

• Predicting the exact time of an earthquake

• Measuring the temperature changes during an earthquake

What magnitude of earthquakes is mentioned as a threshold for issuing warnings?

• 7 or greater

• 6 or greater

• 5 or greater

• 8 or greater

How many people are needed to contribute information for crowd-sourced earthquake warnings?

• All people in the affected area

• Half of the population

• Only a tiny percentage of people

• A large percentage of the population

What device is primarily used to contribute information for early earthquake warnings?

• Tablets

• Desktop computers

• Smartphones

• Laptops

What is the main goal of using crowd-sourced data in earthquake detection?

• To reduce the cost of earthquake research

• To improve smartphone battery life

• To achieve early earthquake warnings

• To increase the speed of internet connections