A seismogram is a visual record that is created by a seismograph. A seismograph is a piece of equipment that records earthquake movements. These two items go hand in hand and are essential for the study of earthquakes.Know More
Without a seismograph, there would be no seismogram. A seismograph detects movement in the Earth's crust, translating that movement through its inner workings to move a recording device, often a needle, that makes markings on what becomes the seismogram. The base of a mechanical seismograph moves beneath the hanging needle, and on the base rests paper. On the paper rests the needle, which should not move when the ground beneath it does. The resulting lines are a seismogram which can be read to understand information about the earthquake or movement, such as its intensity. Electronic seismographs produce printed seismograms. A seismograph can also be called a seismometer.
Seismographs and seismograms are also used to detect explosions, such as when a large bomb goes off, or volcanic activity. These items are used to detect not only how strong the vibrations are, but also to triangulate where the vibrations originate from. In other words, three seismographs in three different locations create seismograms that, when read correctly, can tell researchers where exactly the explosion or earthquake occurred.Learn more about Earthquakes
A seismograph has two basic parts; an outer case that moves with the undulations of the earth, and an inner core that remains stable and records the earth's movements. Some seismographs are manual, but most now record the data electromagnetically.Full Answer >
You can make a seismograph to measure vibrations such as earthquakes with such objects as a cup, a string, a box and a marker. This in-home science project only takes 10 to 20 minutes to set up.Full Answer >
The Chinese seismograph was an instrument developed in 132 A.D. by the Chinese philosopher Chang Hêng to detect earthquakes and determine the direction from which they came. It was a brass instrument decorated with eight dragons, each holding a copper ball. On the base were eight frogs, each with their mouth open, to catch the ball when it drops.Full Answer >
John Milne was given credit for creating the modern seismograph in 1880. His invention of the horizontal pendulum seismograph has been improved throughout the years, but the main concept is still being used today.Full Answer >