The instrument used to record ground motion during earthquakes.

The instrument used to record ground motion during earthquakes.

• A. Epicenter
• B. Pangaea
• C. Tsunami
• D. Seismometer (Seismograph)

Answer: (D)

Recording ground motion during earthquakes is done with a seismometer, also known as a seismograph. This instrument detects vibrations in the ground and turns them into electrical signals, which are displayed as a seismogram. By analyzing the timing and size of the waves on the seismogram, scientists can determine how strong the quake was and help locate its epicenter. The other terms are not measuring devices: the epicenter is a location on the Earth's surface above the quake, Pangaea was an ancient supercontinent, and a tsunami is a large ocean wave caused by the quake, not a recording instrument.

Recording ground motion during earthquakes is done with a seismometer, also known as a seismograph. This instrument detects vibrations in the ground and turns them into electrical signals, which are displayed as a seismogram. By analyzing the timing and size of the waves on the seismogram, scientists can determine how strong the quake was and help locate its epicenter. The other terms are not measuring devices: the epicenter is a location on the Earth's surface above the quake, Pangaea was an ancient supercontinent, and a tsunami is a large ocean wave caused by the quake, not a recording instrument.