What is a seismograph recording?
Seismographs are instruments used to record the motion of the ground during an earthquake. As the seismograph shakes under the mass, the recording device on the mass records the relative motion between itself and the rest of the instrument, thus recording the ground motion.
What is the recording made by a seismograph called?
seismogram
The visual record produced by a seismograph is called a seismogram.
What 3 movements do a seismograph record?
To overcome this problem, modern seismograph stations have three separate instruments to record horizontal waves – (1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions.
How can seismograph record the occurrence of earthquake?
Seismometers allow us to detect and measure earthquakes by converting vibrations due to seismic waves into electrical signals, which we can then display as seismograms on a computer screen. Seismologists study earthquakes and can use this data to determine where and how big a particular earthquake is.
What can seismograms tell you?
Seismograms are used to determine the location and magnitude of earthquakes. By measuring the time interval between the arrivals of the P and S wave groups seismologists are able to calculate the distance between the seismograph and the origin of the earthquake.
How do seismometers work?
An instrument sensitive to tiny movements in the ground. A seismometer is a device that is sensitive to vibrations. It works on the principle of a pendulum: a heavy, inert mass with a certain resistance to movement (i.e. inertia) due to its weight is suspended from a frame by a spring that allows movement.
What’s the difference between seismograph and seismogram?
The terms seismograph and seismometer are often used interchangeably; however, whereas both devices may detect and measure seismic waves, only a seismograph possesses the capacity to record the phenomena. A record produced by a seismograph on a display screen or paper printout is called a seismogram.
How does seismograph help us?
Seismographs can detect quakes that are too small for humans to feel. During an earthquake, ground-shaking seismic waves radiate outward from the quake source, called the epicenter. These measurements allow scientists to estimate the distance, direction, magnitude, and the type of earthquake that just occurred.
What is graphical record of an earthquake?
The graphical output from a seismograph is called a seismogram. Figure 12.10 (right) shows how a seismograph works. The instrument consists of a frame or housing that is firmly anchored to the ground.
How do I read seismograph?
The seismogram is “read” like a book, from left to right and top to bottom (this is the direction that time increases). As with a book, the right end of any horizontal line “connects” with the left end of the line below it. Each line represents 15 minutes of data; four lines per hour.
What is seismograph explain with example?
Frequency: The definition of a seismograph is a measuring instrument for earthquakes that tracks duration and magnitude. A device used to measure the duration and magnitude of a San Francisco earthquake is an example of a seismograph.
What patterns do seismograph data reveal?
Seismographs record a zig-zag trace that shows the varying amplitude of ground oscillations beneath the instrument. This record is proportional to the motion of the seismometer mass relative to the earth, but it can be mathematically converted to a record of the absolute motion of the ground.
How does a modern seismograph work?
A seismograph works by using a suspended needle attached to a large mass that ‘draws’ on a piece of paper. When the ground moves, along with the paper, the suspended needle doesn’t move, wich results in the needle drawing zig zags on the paper corresponding to how the ground moves.
What are the parts of a seismograph?
A modern seismograph includes five basic parts: a clock, a sensor called a seismometer that measures intensity of shaking at the instrument’s location, a recorder that traces a chart, or seismogram , of the seismic arrivals, an electronic amplifier, and a data recorder that stores the information for later analysis.
Where was the earliest seismograph developed?
The earliest version of the seismograph was developed in China around the second century. Various versions of the device were developed over the following centuries, with models similar to modern incarnations appearing around the 1880s.