Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Strainmeter> ?p ?o. }
Showing items 1 to 28 of
28
with 100 items per page.
- Strainmeter abstract "A strainmeter is an instrument used by geophysicists to measure thedeformation of the Earth.Linear strainmeters measure the changes in the distance between two points,using either a solid piece of material (over a short distance)or a laser interferometer (over a long distance, up to several hundred meters).The type using a solid length standard was invented by Benioff in 1932,using an iron pipe; later instruments used rods made of fused quartz.Modern instruments of this type can make measurements of length changes oververy small distances, and are commonly placed in boreholes to measuresmall changes in the diameter of the borehole.Another type of borehole instrument detects changes in a volume filled withfluid (such as silicone oil).The most common type is the dilatometer invented by Sacks and Evertson in the USA(patent 3,635,076);a design that uses specially shaped volumes to measure the strain tensorhas been developed by Sakata in Japan.All these types of strainmeters can measure deformation over frequenciesfrom a few Hz to periods of days, months, and years. This allows them to measuresignals at lower frequencies than can be detected with seismometers.Most strainmeter records show signals from the earth tides, and seismic wavesfrom earthquakes.At longer periods, they can also record the gradual accumulation of stress (physics)caused by plate tectonics, the release of this stress in earthquakes,and rapid changes of stress following earthquakes.The most extensive network of strainmeters is installed in Japan;it includes mostly quartz-bar instruments in tunnels and borehole strainmeters,with a few laser instruments.Starting in 2003 there has been a major effort (the Plate Boundary Observatory)to install many more strainmeters along the Pacific/North-America plate boundaryin the United States.The aim is to install about 100 borehole strainmeters,primarily in Washington, Oregon and California, and five laser strainmeters,all in California.".
- Strainmeter wikiPageExternalLink pboweb.unavco.org.
- Strainmeter wikiPageExternalLink pfostrain.ucsd.edu.
- Strainmeter wikiPageExternalLink index.html.
- Strainmeter wikiPageExternalLink www.gtsmtechnologies.com.
- Strainmeter wikiPageID "2052015".
- Strainmeter wikiPageRevisionID "601125502".
- Strainmeter hasPhotoCollection Strainmeter.
- Strainmeter subject Category:Geophysics.
- Strainmeter subject Category:Measuring_instruments.
- Strainmeter subject Category:Seismology_measurement.
- Strainmeter type Artifact100021939.
- Strainmeter type Device103183080.
- Strainmeter type Instrument103574816.
- Strainmeter type Instrumentality103575240.
- Strainmeter type MeasuringInstrument103733925.
- Strainmeter type MeasuringInstruments.
- Strainmeter type Object100002684.
- Strainmeter type PhysicalEntity100001930.
- Strainmeter type Whole100003553.
- Strainmeter comment "A strainmeter is an instrument used by geophysicists to measure thedeformation of the Earth.Linear strainmeters measure the changes in the distance between two points,using either a solid piece of material (over a short distance)or a laser interferometer (over a long distance, up to several hundred meters).The type using a solid length standard was invented by Benioff in 1932,using an iron pipe; later instruments used rods made of fused quartz.Modern instruments of this type can make measurements of length changes oververy small distances, and are commonly placed in boreholes to measuresmall changes in the diameter of the borehole.Another type of borehole instrument detects changes in a volume filled withfluid (such as silicone oil).The most common type is the dilatometer invented by Sacks and Evertson in the USA(patent 3,635,076);a design that uses specially shaped volumes to measure the strain tensorhas been developed by Sakata in Japan.All these types of strainmeters can measure deformation over frequenciesfrom a few Hz to periods of days, months, and years. ".
- Strainmeter label "Strainmeter".
- Strainmeter sameAs m.06hqmh.
- Strainmeter sameAs Q7621134.
- Strainmeter sameAs Q7621134.
- Strainmeter sameAs Strainmeter.
- Strainmeter wasDerivedFrom Strainmeter?oldid=601125502.
- Strainmeter isPrimaryTopicOf Strainmeter.