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Topic: Seismograph

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	Howstuffworks "How does a seismograph work? What is the Richter scale?"
		A seismograph is the device that scientists use to measure earthquakes.
		The goal of a seismograph is to accurately record the motion of the ground during a quake.
		A big mechanical seismograph may have a weight attached that weighs 1,000 pounds (450 kg) or more, and it drives a set of levers that significantly magnify the pen's motion.
	science.howstuffworks.com /question142.htm (379 words)

	Scientists Resurrect World's Earliest Seismograph
		The announcement in Zhengzhou, also home to the seismograph's original inventor Zhang Heng (AD 78-139), came almost two months after the device passed relevant appraisal and examination by a scientific committee in April.
		According to "History of Later Han Dynasty," Zhang Heng's seismograph was an urn-like instrument with a central pendulum.
		Invented by Zhang Heng in AD 132 and given the name "Houfeng Didong Yi" Instrument for inquiring into the wind and the shaking of the Earth the original of the seismograph did not survive the passage of time.
	www.china.org.cn /english/features/Archaeology/132771.htm (645 words)

	Video -- Bucknell Seismograph Recorded Indian Ocean Earthquake \|\| Bucknell University
		The Bucknell seismograph readout from the Dec. 25 event shows a distinct cluster of waves that traveled through the earth followed by an intense readout of surface waves.
		The campus seismograph station was set up by Gary Nottis of Lewisburg, a Bucknell graduate who had worked for 16 years as an earthquake historian for the New York State Geological Survey.
		Data from the seismograph is sent to a computer where it is then analyzed.
	www.bucknell.edu /x29852.xml (548 words)

	What is a Seismograph?
		Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph.
		Advances in seismograph technology have increased our understanding of both earthquakes and the Earth itself.
		Perhaps the earliest seismograph was invented in China A.D. 136 by a m an named Choko.
	www.thetech.org /exhibits/online/quakes/seismo (0 words)

	How seismograph is made - Background, Raw materials, Design, The manufacturing process of seismograph, Quality control
		Seismographs are instruments designed to detect and measure vibrations within the earth, and the records they produce are known as seismograms.
		Today most seismographs still rely on the basic designs introduced by Milne and his associates, and scientists continue to evaluate tremors by studying the movement of the earth relative to the movement of a pendulum.
		Today, three types of seismographs are used in earthquake research, each with a period corresponding to the scale of the vibrations it will measure (the period is the length of time a pendulum requires to complete one full oscillation).
	www.madehow.com /Volume-1/Seismograph.html (2589 words)

	Seismograph - █ further reading:
		A seismograph is an instrument that measures and records elastic ground vibrations called seismic waves that are generated by earthquakes and man-made explosions.
		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.
		Their seismographs, however, recorded only a limited range of wave sizes and seismic events, the instruments were fairly inaccurate, and they required difficult mechanical calibration.
	www.espionageinfo.com /Re-Se/Seismograph.html (976 words)

	Seismology - Seismograph (Site not responding. Last check: )
		Seismograph is an instrument that amplifies and records small movements of the ground.
		A vertical seismograph that will register the ups and downs of the earth's crust and two horizontal seismographs that registers the north-south direction and the east-west direction.
		A seismograph produces wavy lines that reflect the size of seismic waves passing beneath it.
	library.thinkquest.org /C005686/htmfiles/seismograph.htm (327 words)

	Build Your Own Seismograph
		With a few materials and some time, you can build your own seismograph.
		A heavy weight is fastened to a horizontal rod as shown in the diagram.
		Ever since people first became curious about earthquakes, they have tried to design some kind of seismograph.
	cse.ssl.berkeley.edu /lessons/indiv/davis/hs/Seismograph.html (837 words)

	Maryland Geological Survey: Online Seismograph Help
		The seismograph is best viewed on a monitor with a resolution of 800 by 600, or better.
		Recent reports indicate the seismograph works on OS X. The online seismograph was designed and programmed by Jonathan Labin, a graduate of the Department of Computer Science and Electrical Engineering at University of Maryland, Baltimore County.
		The seismograph uses a Java applet which is downloaded into, and executed by, you web browser.
	www.mgs.md.gov /seismics/lshelp.shtml (369 words)

	Seismograph
		A seismograph is a device used for recording earth tremors.
		A simple seismograph, as shown here, is easy to build and will record local vibrations such as passing trucks or people walking past it.
		There is more room for improvisation with the recorder than with the rest of the seismograph.
	bizarrelabs.com /seis.htm (959 words)

	[No title] (Site not responding. Last check: )
		Since the seismograph is most sensitive to waves passing perpendicularly to the boom and since most earthquakes occur on an east-west azimuth, you should set up your seismograph with the boom running north and south.
		The distance is often quoted in terms of the angular distance between the focus of the earthquake and the seismograph as measured from the center of the earth.
		The seismograph seems to have received little attention from geology and earth-science teachers and it appears that perhaps less than a dozen are in operation in the United States (G. Barker, personal communication).
	psn.quake.net /lehman.txt (5667 words)

	Seismographs : Thomas Instruments, -vibration monitoring equipment
		Seismographs can be traced back many centuries to the Chinese and Egyptians using devices that would allow marbles to be rolled or cause objects to fall to determine levels of vibration.Many advances have taken place, particularly in the past twenty years, in blasting seismographs.
		A blasting seismograph is used to monitor, record, analyze, display and print ground vibration (motion) and airblast resulting from a blast event.
		When the trigger level is exceeded the seismograph collects and records the data for the selected record time (set by the operator in seconds) plus a half second of pre-trigger record time.
	vibration.com /v2/index.php?main_page=seismographs (651 words)

	Seismograph: World of Earth Science
		A seismograph is an instrument used to measure and record ground vibration caused by explosions and earthquake shock waves.
		After the first modern seismograph was installed in the United States at the University of California at Berkeley, it recorded the 1906 earthquake that devastated San Francisco.
		Seismographs detect the force of atomic blasts and nuclear explosions, and are also used to detect the speed of seismic waves traveling in the earth.
	science.enotes.com /earth-science/seismograph (758 words)

	REV - Glossary
		Magnitude is based on measurement of the maximum motion recorded by a seismograph.
		For REV the criteria for notable earthquakes is a magnitude greater than 5.5 for worldwide earthquakes and greater than 3 for earthquakes in the United States.
		This combination of instruments tells a seismologist the general direction of the seismic wave source, the magnitude at its source, and the character of the wave motion.
	rev.seis.sc.edu /definition.html (1612 words)

	Howstuffworks "How does a seismograph work? What is the Richter scale?"
		A seismograph is the device that scientists use to measure earthquakes.
		The goal of a seismograph is to accurately record the motion of the ground during a quake.
		A big mechanical seismograph may have a weight attached that weighs 1,000 pounds (450 kg) or more, and it drives a set of levers that significantly magnify the pen's motion.
	www.howstuffworks.com /question142.htm (379 words)

	Mintrop Mechanical Seismograph
		The Mintrop mechanical seismograph consists of the two units shown, a detector of seismic waves on the right and a recorder of these waves on the left.
		Commencing in the early 1930's, mechanical seismographs were supplanted by electronic recorders and electromagnetic transducers, called seismometers, which are several times more sensitive.
		It was the first commercial seismograph and its successful application was the catalyst for initiation of seismic exploration world wide.
	www.mssu.edu /seg-vm/Mintrop.html (647 words)

	Seistronix RAS-24 Exploration Seismograph
		The RAS-24 is a modular 24-channel, high resolution, signal enhancement seismograph designed for shallow refraction and reflection surveys, and general geophysical exploration.
		Based on a "distributed" approach, like larger seismic systems used for oil and gas surveys, the RAS-24 is the first refraction/reflection seismograph to combine state-of-the-art 24-bit conversion with a flexible, expandable architecture that provides the ease of use of a conventional system with the advantages of a distributed system.
		Whether you’re looking for a 12-channel refraction seismograph or a 240-channel reflection system for 3D, the RAS-24 has the data quality, features and performance you need for the most demanding jobs.
	seistronix.com /ras_g.htm (952 words)

	Sensational ancient artefact of the "Zhang Heng seismograph" (in English)
		Historic descriptions of the "Zhang Heng seismograph" indicate, that to the egg-shell body only dragon heads were attached, not whole dragons as it is visible on Figures 1 and 4.
		Furthermore, the general shape and the appearance of it, is strangely similar to the shape and the appearance of the "Zhang Heng seismograph".
		I personally believe that the current revival of "fashion" on the "Zhang Heng seismograph" is not just a coincidence, but actually one of such challenges for humanity to rebuild this unique device and to open new horizons through finding out how it really works.
	chi.maroc.to /artefact.htm (4008 words)

	[No title]
		Constructing the Seismograph: The educational seismograph (Figure 1) is constructed from commercial components (geophone, Vernier Serial Box Interface, SBI; and LoggerPro software installed on a computer) and a homemade electronic circuit (Figures 2 and 3).
		Handheld Seismometer: The educational seismograph can be used with the handheld seismometer as the sensor to record the shaking of the handheld seismometer (or the magnet and coil assembly) to illustrate how a seismometer works and the response of the instrument to motions of the ground.
		KMIdirect, Earthscope PC-based seismograph, $495, with 4.5 Hz geophone, http://www.kmidirect.com/
	web.ics.purdue.edu /~braile/edumod/educseis/educseis.htm (2159 words)

	Seismograph and Bluebell Pools, West Thumb Tour - Yellowstone
		These pools used to be known as the "Blue Pools." After the 1959 Hebgen Lake earthquake, which measured 7.5 on the Richter scale, the pools were renamed.
		At West Thumb, no one recorded the nature of the changes caused by the quake, but perhaps someone thought Seismograph Pool somehow "registered" the earthquakes.
		These days, Seismograph is sometimes muddy—but not from earthquakes.
	www.nps.gov /archive/yell/tours/westthumb/seismograph.htm (97 words)

	[No title] (Site not responding. Last check: )
		The seismograph is being operated at high enough gain so that newsworthy earthquakes from almost anywhere in the world can be recorded.
		The seismograph records ground vibrations from distant, and nearby, earthquakes, which are shaking the ground under Milwaukee.
		But, since the seismograph is highly sensitive, these vibrations are very, very small and cannot be felt by anyone in the city of Milwaukee.
	www.uwm.edu /Dept/Geosciences/qketour/Seistatn/seismic.html (384 words)

	Govt wakes up, proposes seismographs in 6 places - Deccan Herald - Internet Edition (Site not responding. Last check: )
		State Drought Monitoring Cell is setting up Seismographic stations at six places — Bangalore urban, Bangalore rural, Mysore, Shimoga, Bijapur and Gulbarga — in the State under the first phase of the project, Director of Drought Monitoring Cell V S Prakash told Deccan Herald.
		Though Karnataka had a small Seismographic station at Gowribidanur in Kolar, it was not effective to monitor the seismic activity for the entire State.
		Though a seismograph is capable of sensing tremors anywhere on the earth, the accurate data on the magnitude of the tremor can be obtained only when the seismograph is located within 10 km radius of the epicentre (the point on the earth surface directly above an earthquake), he explained.
	www.deccanherald.com /deccanherald/Jun282006/state1737132006627.asp (583 words)

	Seismograph > ENGINEERING.com > Articles Page (Site not responding. Last check: )
		A seismograph is a device used for recording earth tremors.
		Once the basic design is understood, it is possible to design and construct a much more sensitive seismograph.
		There is more room for improvisation with the recorder than with the rest of the seismograph.
	www.engineering.com /Library/ArticlesPage/tabid/85/articleType/ArticleView/articleId/200/Seismograph.aspx (940 words)

	Discoveries and Breakthroughs Inside Science
		A seismograph is an instrument installed in the ground that records and measures the vibrations produced by earthquakes.
		That's why a seismograph uses an object -- usually a large electromagnet -- suspended on springs within a case made of fine wire, to keep the object still, while the case around it moves with the ground's motion.
		The Global Seismograph Network goes one step further, linking 128 seismograph stations in more than 80 countries on all continents to collect and store seismic data from around the world that can be accessed by everyone.
	www.ivanhoe.com /science/story/2005/05/09si.html (461 words)

	Seismograph (Site not responding. Last check: )
		The seismograph was originally designed to record natural earthquakes; however, it can record small scale seismic disturbances caused by mining, induced earthquakes, and nuclear testing.
		In order to measure ground motions, the seismograph must remain steady when the ground moves.
		This method is simple and econmical; however, the seismograph must have a heavy mass to overcome the friction between the pen and paper.
	www.leo.lehigh.edu /projects/seismic/seismograph.html (699 words)

	Datalogging Seismograph: Seismograph
		The top mounting point for the seismograph is with a "1/4" inch bolt through the side of the display cabinet about 35 cm up from the floor of the display cabinet.
		There are hundreds of amateur seismograph web sites that I have surfed through over the last five years from the original 1979 Lehman design (http://psn.quake.net/lehmntxt.html) to very, very advanced electronic designs on the Public Seismic Network in California (http://psn.quake.net/equip.html).
		In some schools it might be more appropriate to have the seismograph, datalogger and computer in the prep or store room and a long VGA cable to the monitor in the lab.
	science.uniserve.edu.au /school/Seismograph/seismograph (3404 words)

	How Are Earthquakes Studied? (Site not responding. Last check: )
		A seismograph is an instrument that records the shaking of the earth's surface caused by seismic waves.
		Most seismographs today are electronic, but a basic seismograph is made of a drum with paper on it, a bar or spring with a hinge at one or both ends, a weight, and a pen.
		When there is an earthquake, everything in the seismograph moves except the weight with the pen on it.
	www.geo.mtu.edu /UPSeis/studying.html (360 words)

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