- Ségur, Mme de (French author)
childrenâs literature: History: To it, Mme de SĂ©gur, in her enormously popular novels, added sentimentality, class snobbery, but also some liveliness and occasional fidelity to child nature. Her âSophieâ series (1850s and 60s), frowned on by modern critics, is still loved by obstinate little French girls. Sans Famille (1878), byâŠ
- Segura River (river, Spain)
Segura River, river in southeastern Spain. It rises in the Segura Mountains in Jaén province and flows east through the driest region of the Iberian Peninsula to enter the Mediterranean Sea south of Alicante, a course of 202 miles (325 km). Much water is drawn off the Segura and its major
- Segway HT (vehicle)
Dean Kamen: âŠAmerican inventor who created the Segway Human Transporter (Segway HT; later called the Segway Personal Transporter [Segway PT]), a motorized device that allowed passengers to travel at up to 20 km (12.5 miles) per hour.
- Segway Human Transporter (vehicle)
Dean Kamen: âŠAmerican inventor who created the Segway Human Transporter (Segway HT; later called the Segway Personal Transporter [Segway PT]), a motorized device that allowed passengers to travel at up to 20 km (12.5 miles) per hour.
- Segway Personal Transporter (vehicle)
Dean Kamen: âŠAmerican inventor who created the Segway Human Transporter (Segway HT; later called the Segway Personal Transporter [Segway PT]), a motorized device that allowed passengers to travel at up to 20 km (12.5 miles) per hour.
- Segway PT (vehicle)
Dean Kamen: âŠAmerican inventor who created the Segway Human Transporter (Segway HT; later called the Segway Personal Transporter [Segway PT]), a motorized device that allowed passengers to travel at up to 20 km (12.5 miles) per hour.
- Seherin von Prevorst. Eröffnungen ĂŒber das innere Leben der Menschen und ĂŒber das Hereinragen einer Geisterwelt in die unsere, Die (work by Kerner)
Justinus Andreas Christian Kerner: âŠGeisterwelt in die unsere (1829; The Seer of Prevorst. Disclosures About the Inner Life of Men and the Projection of a Spiritworld into Ours).
- Sehested, Hannibal (Danish statesman)
Hannibal Sehested was a statesman who achieved partial autonomy for Norway under Denmark and who laid the basis for the modernization of Denmarkâs administrative system. After foreign travels in 1629â32, Sehested was attached to the court of King Christian IV of Denmark and Norway. He was given
- Sehgal, Tino (British-born artist)
Tino Sehgal is a British-born artist who created installations that were known as âconstructed situations.â Sehgal was raised in France and Germany. He studied political economy in Berlin and pursued dance at the Folkwang University of the Arts in Essen, Germany. He joined French experimental dance
- Sehi (Chinese Buddhist monk)
Faxian was a Buddhist monk whose pilgrimage to India in 402 initiated Sino-Indian relations and whose writings give important information about early Buddhism. After his return to China he translated into Chinese the many Sanskrit Buddhist texts he had brought back. Sehi, who later adopted the
- Sehima (plant genus)
savanna: Flora: âŠgrass cover consisting mainly of Sehima and Dichanthium, the latter also referred to as bluestem.
- Sehna knot (carpet-making)
rug and carpet: Materials and technique: The Persian, or asymmetrical, knot is used principally in Iran, India, China, and Egypt. This knot was formerly known as the Senneh (Sehna) knot. The Spanish knot, used mainly in Spain, differs from the other two types in looping around only one warp yarn. After theâŠ
- Sehna rug
Senneh rug, handwoven floor covering made by Kurds who live in or around the town of Senneh (now more properly Sanandaj) in western Iran. The pile rugs and kilims of Senneh are prized for their delicate pattern and colouring and for their fine weave. They are by far the most sophisticated of the
- Sehnsucht der Veronika Voss, Der (film by Fassbinder [1982])
Rainer Werner Fassbinder: âŠSehnsucht der Veronika Voss (1982; Veronika Voss), based on the life of the German actress Sybille Schmitzâwas well received. He also adapted Alfred Döblinâs novel Berlin Alexanderplatz for a 14-part television series in 1980 and later released all of the episodes as a feature film that ran nearly 16 hours.
- Sehore (India)
Sehore, city, western Madhya Pradesh state, central India. It is located on the northern edge of the Vindhya Range near the confluence of the Siwan and Latia rivers, about 20 miles (32 km) west of Bhopal. Sehore was a former British cantonment, and it served as the headquarters of the British
- Sehorn, Marshall (American record producer)
Allen Toussaint: When Toussaint and promotion man Marshall Sehorn set up Sea-Saint Studios in the mid-1960s, a new group of session musicians emerged, including Art Neville on organ, Leo Nocentelli on guitar, George Porter on bass, and Joseph Modeliste on drums. These musicians evolved a new variation of New Orleansâs famous âsecondâŠ
- Sehul, Mikael (regent of Ethiopia)
Mikael Sehul was a nobleman who ruled Ethiopia for a period of 25 years as regent of a series of weak emperors. He brought to an end the ancient Solomonid dynasty of Ethiopia, which had ruled for 27 centuries, and began a long period of political unrest. In the reign of Iyoas (1755â69), son of the
- Ćehzade Mosque (mosque, Istanbul, Turkey)
Islamic arts: Architecture: âŠthe Selim Mosque (1522), the Ćehzade kĂŒlliye (1548), and the SĂŒleyman kĂŒlliye (after 1550). The Ćehzade and SĂŒleyman kĂŒlliyes were built by Sinan, the greatest Ottoman architect, whose masterpiece is the Selim Mosque at Edirne, Turkey (1569â75). All those buildings exhibit total clarity and logic in
- Sei Fuji v. State of California (law case)
international law: International law and municipal law: In Sei Fujii v. State of California (1952), for example, the California Supreme Court held that the UN Charter was not self-executing because its relevant principles concerning human rights lacked the mandatory quality and certainty required to create justiciable rights for private persons upon its ratification;âŠ
- Sei personaggi in cerca dâautore (play by Pirandello)
Six Characters in Search of an Author, play in three acts by Luigi Pirandello, produced and published in Italian in 1921 as Sei personaggi in cerca dâautore. Introducing Pirandelloâs device of the âtheatre within the theatre,â the play explores various levels of illusion and reality. It had a great
- Sei ShĆnagon (Japanese writer)
Sei ShĆnagon was a diarist, poet, and courtier whose witty, learned Pillow Book (Makura no sĆshi) exhibits a brilliant and original Japanese prose style and is a masterpiece of classical Japanese literature. It is also the best source of information on Japanese court life in the Heian period
- sei whale (mammal)
sei whale, (Balaenoptera borealis), species of baleen whale capable of short bursts of speed that make it the swiftest of the rorquals. Usually attaining a length of about 13â15 metres (43â49 feet), this cetacean is bluish gray or blackish above with paler underparts and a relatively large
- Sei-in (Japanese government)
DajĆkan: âŠthe various ministries; and a Central Chamber (Sei-in), which subsumed the powers of the other two chambers.
- Seibert, Florence (American scientist)
Florence Seibert was an American scientist, best known for her contributions to the tuberculin test and to safety measures for intravenous drug therapy. Seibert contracted polio at age three, but became an outstanding student, graduating at the top of her high-school class and winning a scholarship
- Seibert, Florence Barbara (American scientist)
Florence Seibert was an American scientist, best known for her contributions to the tuberculin test and to safety measures for intravenous drug therapy. Seibert contracted polio at age three, but became an outstanding student, graduating at the top of her high-school class and winning a scholarship
- Seibou, Ali (military dictator of Niger)
Niger: Independence and conflict: âŠin 1987) and then by Ali Seibou. Mahamane Ousmane of the Social Democratic Convention became president in the countryâs first multiparty presidential elections in 1993. Meanwhile, a Tuareg rebellion that had begun in the northern part of the country in the early 1990s gained momentum until a cease-fire agreement inâŠ
- Seibu Lions (Japanese baseball team)
Daisuke Matsuzaka: âŠwho agreed to pay the Seibu Lions more than $51 million for the negotiating rights to Matsuzaka and then signed the pitcher to a six-year contract worth another $52 million.
- seiche (water and meteorology)
seiche, rhythmic oscillation of water in a lake or a partially enclosed coastal inlet, such as a bay, gulf, or harbour. A seiche may last from a few minutes to several hours or for as long as two days. The phenomenon was first observed and studied in Lake Geneva (Lac Léman), Switzerland, in the
- SeichĆno-ie (religion)
Ćmoto: These include SeichĆno-ie (Household of Growth) and Sekai KyĆ«sei-kyĆ (Religion of World Salvation), both founded by former disciples of OnisaburĆ. Ćmoto emphasizes the universal character of religion. It promotes the use of the international language Esperanto and sponsors an organization called ULBA (Universal Love and Brotherhood Association).
- Seidan (work by Ogyƫ Sorai)
Japan: Heterodox Confucian schools: In his work Seidan, for example, Sorai insisted that the main reason for the financial distress of the warrior class in both the bakufu and the domains was that warriors had moved to the cities, where they were at the mercy of a monetary economy. If they wouldâŠ
- seide (Sami religion)
seide, in Sami religion, idols of wood or stone, either natural or slightly shaped by human hands, worshipped as possessing impersonal supernatural power or as actually being inhabited by a spirit with whom one could communicate. Seides were most commonly located in places where some feature of the
- Seidel sum (optics)
optics: Seidel sums: If a lens were perfect and the object were a single point of monochromatic light, then, as noted above, the light wave emerging from the lens would be a portion of a sphere centred about the ideal image point, lying in the paraxialâŠ
- Seidensticker, Edward (American historian, scholar and translator)
National Book Awards: Katherine Anne Porter, Edward Seidensticker, Flannery OâConnor, Lewis Thomas, and Madeleine LâEngle.
- Seider, Christopher (American patriot)
Boston Massacre: The killing of Christopher Seider and the end of the rope: Early in 1770, with the effectiveness of the boycott uneven, colonial radicals, many of them members of the Sons of Liberty, began directing their ire against those businesses that had ignored the boycott. The radicals posted signsâŠ
- Seiemon (Japanese potter)
Ninsei was a Japanese potter active in KyĆto during the Edo period between the Meireki (1655â57) and the Genroku (1688â1703) eras. He learned the art of ceramics by working at the Awata-guchi kiln in KyĆto and the Seto kiln in Mino. His patron, the prince of the Ninna Temple at Omuro Katamachi,
- seif (sand dune)
seif, a long, narrow sand dune or chain of dunes, generally oriented in a direction parallel to the prevailing wind or in a direction resulting from two or more winds blowing at acute angles to each other. The dune crest consists of a series of peaks and gaps, and the steep, or slip, face may
- Seifert, Jaroslav (Czech author)
Jaroslav Seifert was a poet and journalist who in 1984 became the first Czech to win the Nobel Prize for Literature. Seifert made a living as a journalist until 1950, but his first book of poetry, MÄsto v slzĂĄch (âTown in Tearsâ), was published in 1920. His early proletarian poetry reflects his
- Seiffert, Ernst (Austrian-British opera singer)
Richard Tauber was an Austrian-born British tenor celebrated for his work in opera and, especially, operetta. Tauber was studying voice at Freiberg, Ger., at the time of his highly successful operatic debut, as Tamino in Wolfgang Amadeus Mozartâs The Magic Flute (Die Zauberflöte) at the Chemnitz
- Seigenthaler, John, Sr. (American journalist)
Wikipedia: Issues and controversies: In 2005 the American journalist John L. Seigenthaler, Jr., discovered that his Wikipedia biography falsely identified him as a potential conspirator in the assassinations of both John F. Kennedy and Robert F. Kennedy and that these malicious claims had survived Wikipediaâs community policing for 132 days. The author of thisâŠ
- Seignelay, Jean-Baptiste Colbert, marquis de (French diplomat)
Jean-Baptiste Colbert, marquis de Seignelay was the French secretary of state under Louis XIV. As the eldest son of the famous secretary of state of that name, Colbert was given the best possible tutors, who found him bright but lazy. In 1683 Colbert became head of the navy and performed
- Seigner, Emmanuelle (French actress)
Roman Polanski: âŠPolanski married the French actress Emmanuelle Seigner, who starred in his films Frantic (1988), Bitter Moon (1992), The Ninth Gate (1999), La VĂ©nus Ă la fourrure (2013; Venus in Fur), and DâaprĂšs une histoire vraie (2017; Based on a True Story).
- seigneur (feudal lord)
benefice: âŠFrankish sovereign or lord, the seigneur, leased an estate to a freeman on easy terms in beneficium (Latin: âfor the benefit [of the tenant]â), and this came to be called a beneficium, a benefice. The lease normally came to an end on the death of the seigneur or of theâŠ
- seigneur, droit du (feudal law)
droit du seigneur, (French: âright of the lordâ), a feudal right said to have existed in medieval Europe giving the lord to whom it belonged the right to sleep the first night with the bride of any one of his vassals. The custom is paralleled in various primitive societies, but the evidence of its
- seigneurie (European history)
manorialism, political, economic, and social system by which the peasants of medieval Europe were rendered dependent on their land and on their lord. Its basic unit was the manor, a self-sufficient landed estate, or fief that was under the control of a lord who enjoyed a variety of rights over it
- seigniorage (coinage)
seigniorage, the charge over and above the expenses of coinage (making into coins) that is deducted from the bullion brought to a mint to be coined. From early times, coinage was the prerogative of kings, who prescribed the total charge and the part they were to receive as seigniorage. The
- seignorial system (European history)
manorialism, political, economic, and social system by which the peasants of medieval Europe were rendered dependent on their land and on their lord. Its basic unit was the manor, a self-sufficient landed estate, or fief that was under the control of a lord who enjoyed a variety of rights over it
- seignorialism (European history)
manorialism, political, economic, and social system by which the peasants of medieval Europe were rendered dependent on their land and on their lord. Its basic unit was the manor, a self-sufficient landed estate, or fief that was under the control of a lord who enjoyed a variety of rights over it
- seika (Japanese floral art)
Ko: Calling the arrangements seika rather than shĆka, the Ko school retained the tall, narrow-mouthed type of vase used in the shĆka arrangements of the IkenobĆ school. The mood of the arrangements was known as nageire, a fresh and spontaneous style that adheres only loosely to the classical rulesâŠ
- Seika ron (work by Ishida Baigan)
Ishida Baigan: Ishidaâs works include Seika ron (1774), an essay on family government espousing the Confucian view that a man who cannot govern his family cannot govern a nation. His disciples published Ishida sensei goroku (âThe Sayings of Professor Ishidaâ) in 1806.
- Seikan Tonneru (tunnel, Japan)
Seikan Tunnel, undersea tunnel linking Japanâs main island of Honshu with the northern neighbouring island of Hokkaido. The Seikan Tunnel is the second longest tunnel in the world, after the Gotthard Base Tunnel in Switzerland. It is 53.8 km (33.4 miles) long, 23.3 km (14.3 miles) of which lie
- Seikan Tunnel (tunnel, Japan)
Seikan Tunnel, undersea tunnel linking Japanâs main island of Honshu with the northern neighbouring island of Hokkaido. The Seikan Tunnel is the second longest tunnel in the world, after the Gotthard Base Tunnel in Switzerland. It is 53.8 km (33.4 miles) long, 23.3 km (14.3 miles) of which lie
- Seimas (Lithuanian legislature)
Lithuania: Constitutional framework: âŠpresident and a legislature, the Seimas, under a parliamentary system. The Seimas consists of 141 members, who are elected to four-year terms. The prime minister, formally appointed by the president, oversees the countryâs day-to-day affairs and is generally the leader of the Seimasâs majority party. The president is popularly electedâŠ
- Sein (sculpture by César)
CĂ©sar: His sensational gigantic Sein was modeled on a cabaret dancerâs breast and molded in pink polyester resin. One of his more widely available works, reproduced in many sizes for commercial sale, was a representation of his thumb; Le Pouce, a 12-metre (40-foot) version, was erected in the ParisianâŠ
- Sein und Zeit (work by Heidegger)
Being and Time, work by the German existentialist philosopher Martin Heidegger, first published in German (as Sein und Zeit) in 1927, that permanently altered the course of philosophy in continental Europe. Widely regarded as Heideggerâs masterpiece, Being and Time generated a level of excitement
- Seine Basin (region, France)
Paris Basin, geographic region of France, constituting the lowland area around Paris. Geologically it is the centre of a structural depression that extends between the ancient Armoricain Massif (west), the Massif Central (south), and the Vosges, Ardennes, and Rhineland (east). The area, which forms
- seine net
commercial fishing: Seines: The seine net has very long wings and towing warps (tow lines), with or without bags for the catch. With purse seines, pelagic fish are surrounded not only from the side but also from underneath, preventing them from escaping by diving downward. Purse seines can beâŠ
- Seine River (river, France)
Seine River, river of France, after the Loire its longest. It rises 18 miles (30 kilometres) northwest of Dijon and flows in a northwesterly direction through Paris before emptying into the English Channel at Le Havre. The river is 485 miles (780 kilometres) long and with its tributaries drains an
- Seine Series (geology)
Seine Series, division of Precambrian rocks that occur in Ontario and northern Minnesota (the Precambrian began about 3.96 billion years ago and ended 540 million years ago). The Seine Series, named for prominent exposures studied along the Seine River, Ontario, forms a thick sequence of
- Seine, Battle of the (English history)
Henry V: The French wars: âŠmedieval kings, and after the Battle of the Seine (August 1416), Englandâs naval mastery of the Channel was not seriously disputed. At home, Henry turned to the systematic financing of his projected invasion, partly through large-scale borrowing, partly through parliamentary taxation, the generosity of which reflects his success in arousingâŠ
- Seine-et-Marne (department, France)
Ăle-de-France: âŠthe north-central dĂ©partements of Val-dâOise, Seine-et-Marne, Seine-Saint-Denis, Ville-de-Paris, Hauts-de-Seine, Val-de-Marne, Essonne, and Yvelines. Ăle-de-France is bounded by the rĂ©gions of Hauts-de-France to the north, Grand Est to the east,
- Seine-Inférieure (department, France)
Haute-Normandie: âŠnorthern dĂ©partements of Eure and Seine-Maritime and encompassed the northeastern portion of historical Normandy.
- Seine-Maritime (department, France)
Haute-Normandie: âŠnorthern dĂ©partements of Eure and Seine-Maritime and encompassed the northeastern portion of historical Normandy.
- Seine-Saint-Denis (department, France)
Ăle-de-France: of Val-dâOise, Seine-et-Marne, Seine-Saint-Denis, Ville-de-Paris, Hauts-de-Seine, Val-de-Marne, Essonne, and Yvelines. Ăle-de-France is bounded by the rĂ©gions of Hauts-de-France to the north, Grand Est to the east, Bourgogne-Franche-ComtĂ© to the southeast,
- Seinen no wa (work by Noma)
Noma Hiroshi: âŠmultivolume work completed in 1971, Seinen no wa (âRing of Youthâ), which won the Tanizaki Prize in 1971. Other later works include the autobiographical Waga tĆ wa soko ni tatsu (1961; âMy Tower Stands Thereâ), Shinran (1973), and Sayama saiban (1976; âThe Sayama Trialâ). These works, while conveying a deepeningâŠ
- seiner (fishing vessel)
commercial fishing: Seiners: Seiners range in size from canoes, where the net is hauled by hand, to larger vessels with powerful net-handling equipment. This equipment generally consists of a power block mounted on a crane placed aft of the wheelhouse, as well as winches and drums forâŠ
- Seinfeld (American television series)
Seinfeld, U.S. television situation comedy that was among the most popular programs of the 1990s. Revered by critics, Seinfeld aired for nine seasons (1989â98) on National Broadcasting Co. (NBC), serving as the linchpin of the networkâs ââmust-see TVââ Thursday night lineup. Set in Manhattan and
- Seinfeld, Jerome (American comedian)
Jerry Seinfeld is an American comedian whose television show Seinfeld (1989â98) was a landmark of American popular culture in the late 20th century. Ostensibly a âshow about nothing,â the sitcom highlighted Seinfeldâs observational humor. Seinfeldâs interest in comedy was sparked at an early age
- Seinfeld, Jerry (American comedian)
Jerry Seinfeld is an American comedian whose television show Seinfeld (1989â98) was a landmark of American popular culture in the late 20th century. Ostensibly a âshow about nothing,â the sitcom highlighted Seinfeldâs observational humor. Seinfeldâs interest in comedy was sparked at an early age
- Seingalt, Jacques, Chevalier de (Italian adventurer)
Giacomo Casanova was an ecclesiastic, writer, soldier, spy, and diplomatist, chiefly remembered as the prince of Italian adventurers and as the man who made the name Casanova synonymous with âlibertine.â His autobiography, which perhaps exaggerates some of his escapades, is a splendid description
- Seinte Resurreccion (French literature)
French literature: Religious drama: Neither it nor the Seinte Resurreccion (c. 1200; âResurrection of the Saviourâ), certainly Anglo-Norman, shows the events preceding the Crucifixion, the matter of the Passion plays; these first appeared in the early 14th century in the Passion du Palatinus (âPassion of Palatinusâ). Of relatively modest proportions, this contains diversifiedâŠ
- Seipel, Ignaz (chancellor of Austria)
Ignaz Seipel was a Roman Catholic priest, twice chancellor of Austria (1922â24 and 1926â29), whose use of the Fascist paramilitary Heimwehr in his struggle against Austriaâs Social Democrats led to a strengthening of Fascism in his country. Ordained in 1899, Seipel taught moral philosophy at the
- Seis de Septiembre (county seat, Argentina)
MorĂłn, cabecera (county seat) and partido (county) of Gran (Greater) Buenos Aires, eastern Argentina. It lies west of the city of Buenos Aires, in Buenos Aires provincia (province). In the 16th century MorĂłn served as a way station for travelers en route to the area that is now Chile and Peru. The
- Seis del Solar (musical group)
RubĂ©n Blades: With Seis del Solar he recorded Buscando AmĂ©rica, which was named a Top Ten album of 1984. At the height of his popularity, Blades took a break from his musical career to earn a masterâs degree (1985) in international law from Harvard University. In 1987 heâŠ
- Seis problemas para Don Isidro Parodi (work by Borges and Bioy Casares)
Adolfo Bioy Casares: âŠpara Don Isidro Parodi (1942; Six Problems for Don Isidro Parodi) and CrĂłnicas de Bustos Domecq (1967; Chronicles of Bustos Domecq), both of which satirize a variety of Argentine personalities. The two also edited Los mejores cuentos policiales (1943; âThe Greatest Detective Storiesâ), a two-volume book of gaucho poetry (PoesĂaâŠ
- seisachtheia (ancient Greek law)
land reform: Ancient reforms: âŠreform law, known as the seisachtheia, or âshaking-off the burdens,â cancelled all debts, freed the hektÄmoroi, destroyed the horoi, and restored land to its constitutional holders. Solon also prohibited the mortgaging of land or of personal freedom on account of debt.
- Seisenegger, Jakob (painter)
Titian: Portraits: âŠcopy of a portrait by Jakob Seisenegger, survives. Charles was so pleased with Titianâs work that in May 1533 he bestowed upon the artist the most extraordinary honor of knighthood. Thereafter, the Austrian-Spanish Habsburgs remained Titianâs most important patrons. Charles attempted to induce Titian to go to Spain in 1534âŠ
- Seishimaru (Buddhist priest)
HĆnen was a Buddhist priest and the founder of the Pure Land (JĆdo) Buddhist sect of Japan. He was seminal in establishing Pure Land pietism as one of the central forms of Buddhism in Japan. Introduced as a student monk to Pure Land doctrines brought from China by Tendai priests, he stressed
- Seisill family (English family)
Cecil Family, one of Englandâs most famous and politically influential families, represented by two branches, holding respectively the marquessates of Exeter and Salisbury, both descended from William Cecil, Lord Burghley, Elizabeth Iâs lord treasurer. Burghleyâs elder son, Thomas, was created Earl
- seisin (feudal law)
seisin, in English feudal society, a term that came to mean a type of possession that gained credibility with the passage of time. Seisin was not ownership nor was it mere possession that could be established by the seizure of land. Seisin belonged to someone who used the land or exercised rights
- seismic array (geophysics)
earthquake: Seismographs and accelerometers: âŠto secure such measurements, special arrays of strong-motion seismographs have been installed in areas of high seismicity around the world. Large-aperture seismic arrays (linear dimensions on the order of 1 to 10 km, or 0.6 to 6 miles) of strong-motion accelerometers can now be used to improve estimations of speed,âŠ
- seismic belt
seismic belt, narrow geographic zone on the Earthâs surface along which most earthquake activity occurs. The outermost layer of the Earth (lithosphere) is made up of several large tectonic plates. The edges where these plates move against one another are the location of interplate earthquakes that
- seismic detector
infrasonics: With an array of seismic detectors, a computational form of holography may be achieved.
- seismic discontinuity (geophysics)
olivine: Meteorites and the Earthâs mantle: âŠso-called 20° discontinuity, an observed seismic discontinuity in the mantle at a depth of about 400 kilometres.
- seismic expectancy map (seismology)
earthquake: Constructing seismic hazard maps: âŠavoid weaknesses found in earlier earthquake hazard maps, the following general principles are usually adopted today:
- seismic hazard map (seismology)
earthquake: Constructing seismic hazard maps: âŠavoid weaknesses found in earlier earthquake hazard maps, the following general principles are usually adopted today:
- seismic moment (geophysics)
earthquake: Earthquake magnitude: âŠearthquake size is usedânamely, the seismic moment (M0). Such a parameter is related to the angular leverage of the forces that produce the slip on the causative fault. It can be calculated both from recorded seismic waves and from field measurements of the size of the fault rupture. Consequently, seismicâŠ
- seismic ray (geophysics)
earthquake: Seismological tomography: âŠeach wave type with its ray path through the Earth must be made.
- seismic recording
seismic wave: Seismographs record the amplitude and frequency of seismic waves and yield information about the Earth and its subsurface structure. Artificially generated seismic waves recorded during seismic surveys are used to collect data in oil and gas prospecting and engineering.
- seismic reflection method
Earth exploration: Seismic reflection methods: Most seismic work utilizes reflection techniques. Sources and Geophones are essentially the same as those used in refraction methods. The concept is similar to echo sounding: seismic waves are reflected at interfaces where rock properties change and the round-trip travel time, togetherâŠ
- seismic refraction method
Earth exploration: Seismic refraction methods: Seismic methods are based on measurements of the time interval between initiation of a seismic (elastic) wave and its arrival at detectors. The seismic wave may be generated by an explosion, a dropped weight, a mechanical vibrator, a bubble of high-pressure airâŠ
- seismic sea wave (water wave)
tsunami, catastrophic ocean wave, usually caused by a submarine earthquake, an underwater or coastal landslide, or a volcanic eruption. The term tidal wave is frequently used for such a wave, but it is a misnomer, for the wave has no connection with the tides. After an earthquake or other
- Seismic Sea Wave Warning System
earthquake: Tsunamis: A key development is the Seismic Sea Wave Warning System, an internationally supported system designed to reduce loss of life in the Pacific Ocean. Centred in Honolulu, it issues alerts based on reports of earthquakes from circum-Pacific seismographic stations.
- seismic survey
seismic survey, method of investigating subterranean structure, particularly as related to exploration for petroleum, natural gas, and mineral deposits. The technique is based on determining the time interval that elapses between the initiation of a seismic wave at a selected shot point (the
- seismic tomography (geology)
plate tectonics: Seismic tomography: A powerful technique, seismic tomography, provides insight into the understanding of plate-driving mechanisms. This technique is similar in principle to that of the CT (computed tomography) scan and creates three-dimensional images of Earthâs interior by combining information from many earthquakes. Seismic waves
- seismic wave
seismic wave, vibration generated by an earthquake, explosion, or similar energetic source and propagated within the Earth or along its surface. Earthquakes generate four principal types of elastic waves; two, known as body waves, travel within the Earth, whereas the other two, called surface
- seismicity (geology)
seismicity, the worldwide or local distribution of earthquakes in space, time, and magnitude. More specifically, it refers to the measure of the frequency of earthquakes in a regionâfor example, the number of earthquakes of magnitude between 5 and 6 per 100 square km (39 square
- seismogram
seismic wave: Seismographs record the amplitude and frequency of seismic waves and yield information about the Earth and its subsurface structure. Artificially generated seismic waves recorded during seismic surveys are used to collect data in oil and gas prospecting and engineering.
- seismograph
seismograph, instrument that makes a record of seismic waves caused by an earthquake, explosion, or other Earth-shaking phenomenon. Seismographs are equipped with electromagnetic sensors that translate ground motions into electrical changes, which are processed and recorded by the instrumentsâ
- seismology (science)
seismology, scientific discipline that is concerned with the study of earthquakes and of the propagation of seismic waves within the Earth. A branch of geophysics, it has provided much information about the composition and state of the planetâs interior. The goals of seismological investigations
- seismometer
warning system: Detection of nuclear explosions: âŠcaused by nuclear explosions, the seismometers record many extraneous motions from natural sources; these are called noise. To reduce noise, a large number of seismometers arranged in arrays is used to reinforce the desired signal and exclude unwanted signals. Elaborate data processing, with the help of recorders and computers, furtherâŠ