seismograph (sÿz -mŏ-graf, -grahf) An instrument used in seismology to detect and record the passage of seismic waves, normally by making a continuous recording of the position of a suspended mass in relation to a frame fixed to the ground. 0000011765 00000 n It might seem logical to make the heavy magnet serve as a mass, but that subjects the seismograph to errors when the Earth's magnetic field moves. Seismologist points to a map and seismograph of an earthquake of 6.3 magnitude that hit the New Zealand town of Christchurch (Picture: Ted Aljibe/AFP/Getty) The instrument itself has a … Some seismometers can measure motions with frequencies from 500 Hz to 0.00118 Hz (1/500 = 0.002 seconds per cycle, to 1/0.00118 = 850 seconds per cycle). The general-purpose instruments of small stations or amateurs usually oscillate once per ten seconds.
Some seismometers can measure motions with frequencies from 500 Hz to 0.00118 Hz (1/500 = 0.002 seconds per cycle, to 1/0.00118 = 850 seconds per cycle). In some systems, the mass is held nearly motionless relative to the frame by an electronic In other systems the weight is allowed to move, and its motion produces an electrical charge in a coil attached to the mass which voltage moves through the magnetic field of a magnet attached to the frame. A new technique for detecting earthquakes has been found, using The point of the cable first disturbed by an earthquake's This technique is expected to be a boon in observing earthquakes, especially the smaller ones, in vast portions of the global ocean where there are no seismometers, and at a cost much cheaper than ocean bottom seismometers.
A "Develocorder" was a machine that record data from up to 20 channels into a 16-mm film.
The voltage generated in the photomultiplier was used to drive galvanometers which had a small mirror mounted on the axis. Unfortunately, computer soundcards have filters that limit the frequencies detected to above 40-60 Hz, thus limiting the ability of your homemade seismograph to detect distant earthquakes One alternative is to construct a simple mechanical seismometer and then interface it with a specially designed (but relatively affordable) seismic digitiser . A rotating drum is attached to the frame and a pen is attached to the weight, thus recording any ground motion in a Any movement of the ground moves the frame. This can be mathematically Strong motion sensors are used for intensity meter applications. A seismograph is also sensitive to changes in temperature so many instruments are constructed from low expansion materials such as nonmagnetic The hinges on a seismograph are usually patented, and by the time the patent has expired, the design has been improved. 0000004340 00000 n 0000001167 00000 n 0000009251 00000 n One of the continuing problems with sensitive vertical seismographs is the buoyancy of their masses.
0000001222 00000 n Seismograms typically record motions in three cartesian axes (x, y, and z), with the z axis perpendicular to the Earth’s surface and the x- and y- … 0000002422 00000 n 0000010366 00000 n The level of oil, position on the arm, and angle and size of sheet is adjusted until the damping is "critical", that is, almost having oscillation. Due to the deterioration of older magnetic tape medias, large number of waveforms from the archives are not recoverable. Some other sensitive designs measure the current generated by the flow of a non-corrosive ionic fluid through an Seismometers spaced in an array can also be used to precisely locate, in three dimensions, the source of an earthquake, using the time it takes for A worldwide array of seismometers can actually image the interior of the Earth in wave-speed and transmissivity. 0000003591 00000 n
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seismograph is an example of which computer