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Seismic Vibrator
A seismic vibrator is a truck-mounted or buggy-mounted device that is capable of injecting low-frequency vibrations into the earth. It is one of a number of seismic sources used in reflection seismology. The ‘Vibroseis’ exploration technique (performed with vibrators) was developed by the Continental Oil Company (Conoco) during the 1950s and was a trademark until the company's patent lapsed. Today, seismic vibrators are used to perform about half of all seismic surveys on land. The largest seismic vibration truck in the world, known as 'Nomad 90’, weighs 41.5T and has a 90,000 lbf force. Principle A seismic vibrator transforms the energy provided by a diesel engine into a vibration. It is performed by a shaker, a movable element that generates the vibration thanks to a piston-reaction mass device driven by an electrohydraulic servo valve. The shaker is applied to the ground for each vibration, then raised up so that the seismic vibrator can move to another vibrating poin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nomad 90 Vibrating
A nomad is a member of a community without fixed habitation who regularly moves to and from the same areas. Such groups include hunter-gatherers, pastoral nomads (owning livestock), tinkers and trader nomads. In the twentieth century, the population of nomadic pastoral tribes slowly decreased, reaching an estimated 30–40 million nomads in the world . Nomadic hunting and gathering—following seasonally available wild plants and game—is by far the oldest human subsistence method. Pastoralists raise herds of domesticated livestock, driving or accompanying them in patterns that normally avoid depleting pastures beyond their ability to recover. Nomadism is also a lifestyle adapted to infertile regions such as steppe, tundra, or ice and sand, where mobility is the most efficient strategy for exploiting scarce resources. For example, many groups living in the tundra are reindeer herders and are semi-nomadic, following forage for their animals. Sometimes also described as "no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Vibrator Shaker
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. It also includes studies of earthquake environmental effects such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic, atmospheric, and artificial processes such as explosions. A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of Earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology. History Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus (c. 585 BCE), Anaximenes of Miletus (c. 550 BCE), Aristotle (c. 340 BCE), and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Source
A seismic source is a device that generates controlled seismic energy used to perform both reflection and refraction seismic surveys. A seismic source can be simple, such as dynamite, or it can use more sophisticated technology, such as a specialized air gun. Seismic sources can provide single pulses or continuous sweeps of energy, generating seismic waves, which travel through a medium such as water or layers of rocks. Some of the waves then reflect and refract and are recorded by receivers, such as geophones or hydrophones. Seismic sources may be used to investigate shallow subsoil structure, for engineering site characterization, or to study deeper structures, either in the search for petroleum and mineral deposits, or to map subsurface faults or for other scientific investigations. The returning signals from the sources are detected by seismic sensors (geophones or hydrophones) in known locations relative to the position of the source. The recorded signals are then subjected ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reflection Seismology
Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves. The method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator. Reflection seismology is similar to sonar and echolocation. This article is about surface seismic surveys; for vertical seismic profiles, see VSP. History Reflections and refractions of seismic waves at geologic interfaces within the Earth were first observed on recordings of earthquake-generated seismic waves. The basic model of the Earth's deep interior is based on observations of earthquake-generated seismic waves transmitted through the Earth's interior (e.g., Mohorovičić, 1910). The use of human-generated seismic waves to map in detail the geology of the upper few kilometers of the Earth's crust followed shortly thereafter and h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Oil Company
Conoco Inc. ( ) was an American oil and gas company that operated from 1875 until 2002, when it merged with Phillips Petroleum to form ConocoPhillips. Founded by Isaac Elder Blake in 1875 as the "Continental Oil and Transportation Company". Currently the name Conoco is a brand of gasoline and service station in the United States which belongs to Phillips 66 following the spin-off of ConocoPhillips' downstream assets in May 2012. History The "Continental Oil and Transportation Company" was founded by Isaac Elder Blake in 1875. Based in Ogden, Utah, the company distributed oil, kerosene, benzene, and other products in the western United States. Continental Oil Company was acquired by Standard Oil Company in 1884 and was spun off from Standard Oil during the Standard Oil divestiture in 1911. The main office was later moved to Ponca City, Oklahoma, when in 1929, Marland Oil Company (founded by exploration pioneer E. W. Marland) acquired the Continental Oil Company. Marland Oil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conoco
Conoco Inc. ( ) was an American oil and gas company that operated from 1875 until 2002, when it merged with Phillips Petroleum to form ConocoPhillips. Founded by Isaac Elder Blake in 1875 as the "Continental Oil and Transportation Company". Currently the name Conoco is a brand of gasoline and service station in the United States which belongs to Phillips 66 following the spin-off of ConocoPhillips' downstream assets in May 2012. History The "Continental Oil and Transportation Company" was founded by Isaac Elder Blake in 1875. Based in Ogden, Utah, the company distributed oil, kerosene, benzene, and other products in the western United States. Continental Oil Company was acquired by Standard Oil Company in 1884 and was spun off from Standard Oil during the Standard Oil divestiture in 1911. The main office was later moved to Ponca City, Oklahoma, when in 1929, Marland Oil Company (founded by exploration pioneer E. W. Marland) acquired the Continental Oil Company. Marland Oil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrohydraulic Servo Valve
An electrohydraulic servo valve (EHSV) is an electrically-operated valve that controls how hydraulic fluid is sent to an actuator.https://www.moog.com/literature/ICD/Valves-Introduction.pdf Servo valves are often used to control powerful hydraulic cylinders with a very small electrical signal. Servo valves can provide precise control of position, velocity, pressure, and force with good post-movement damping characteristics. History of electrohydraulic servo valves The electrohydraulic servo valve first appeared in World War II. The EHSVs in use during the 1940s was characterized by poor accuracy and slow response times due to the inability to rapidly convert electrical signals into hydraulic flows. The first two-stage servo valve used a solenoid to actuate a first stage spool which in turn drove a rotating main stage. The servo valves of the World War II-era were similar to this — using a solenoid to drive a spool valve. Advancement of EHSVs took off in the 1950s, largely due to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ken Follett
Kenneth Martin Follett, (born 5 June 1949) is a British author of thrillers and historical novels who has sold more than 160 million copies of his works. Many of his books have achieved high ranking on best seller lists. For example, in the US, many reached the number-one position on the ''New York Times'' Best Seller list, including ''Triple'' (1979), ''The Key to Rebecca'' (1980), ''Lie Down with Lions'' (1985), ''A Dangerous Fortune'' (1993), '' World Without End'' (2007), ''Fall of Giants'' (2010), ''Winter of the World'' (2012), and '' Edge of Eternity'' (2014).New York Times List of Number One Best Sellers Early life and education Follett was born on 5 June 1949 in Cardiff, Wales. He was the first child of Martin Follett, a tax inspector, and Lavinia (Veenie) Follett, who went on to have two more children, Hannah and James. Barred from watching films and television by his Plymouth Brethren parents, he developed an early interest in reading but remained an indifferen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Hammer Of Eden
''The Hammer of Eden'' is a work by Ken Follett published in 1998. Plot It is about a group of people living together in a commune cut off from the rest of the world. When their commune is threatened by a plan to build a dam, they turn desperate and devise a devious plan to arm-twist the governor of California to abandon the project. They transform themselves into eco-terrorists and threaten to start an earthquake if their demands are not met. They set off a series of earthquakes using a stolen seismic vibrator truck from an oil firm. Their leader is an illiterate man called Priest who is helped by a seismology student called Melanie in his plans. Judy Maddox, an FBI agent, is the only one who can stop them and the rest of the story revolves around how she tries to do so. List of characters Main characters * Richard "Priest" Granger: leader of the municipality. He does not hesitate to commit a series of murders to succeed in his insane enterprise. Charismatic personality ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismology
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. It also includes studies of earthquake environmental effects such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic, atmospheric, and artificial processes such as explosions. A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of Earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology. History Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus (c. 585 BCE), Anaximenes of Miletus (c. 550 BCE), Aristotle (c. 340 BCE), and Zha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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