| 单词 | seismic survey | 
| 释义 | > as lemmasseismic survey  1.  Pertaining to, relating to, characteristic of, connected with, or produced by an earthquake, earthquakes, or earth-vibration. Also, relating to or involving earth vibrations produced artificially by explosions.  seismic survey, 		 †(a) a survey of an area in connection with its liability to earthquakes;		 (b) a survey (for oil and gas) employing seismic methods. ΘΚΠ the world > the earth > structure of the earth > formation of features > convulsion > 			[adjective]		 > earthquake terremotive1837 seismic1858 seismical1869 earthquaking1881 seismotic1889 principal1899 macroseismic1903 primary wave1919 seismal1977 1858    R. Mallet in  Rep. Brit. Assoc.  i. 7  				The period of the year at which seismic action appears to be greatest. 1858    R. Mallet in  Rep. Brit. Assoc.  i. 18  				Whether, as a seismic region, Northern Africa have a centre disturbance of its own [etc.]. 1877    Rudler in  Encycl. Brit. VII. 611/1  				The depth of the seismic focus is easily determined. For since the waves radiate from this focus, any two wave-paths when produced backwards will meet at the seismic centre. 1887    G. H. Darwin in  Fortn. Rev. Feb. 267  				Regions subject to earthquakes, or seismic areas. 1887    Trans. Seismol. Soc Japan 10 36  				The first method of avoiding earthquake motion in a given district is to make a seismic survey of that area. 1935    Geol. Natural Gas 		(Amer. Assoc. Petroleum Geologists)	 664  				Seismic surveys isolated a relatively small area with structural closure on the upthrown side of the fault. 1941    Bull. Amer. Assoc. Petroleum Geologists 25 1261  				The unsolved problems in the field of seismic surveying require for their solution a more complete understanding of the properties of the earth strata. 1944    A. Holmes Princ. Physical Geol. xii. 206  				Near the middle of the sheet the ice has been shown by seismic methods..to be over 8,000 feet thick. 1969    Times 16 July 4/2  				The scientific equipment bay where the seismic experiment and the laser rangefinding device are stowed. 1972    Daily Tel. 1 May 2/7  				Seismic studies show these areas could be almost as rich in oil and gas as the North Sea. 1979    Jrnl. Royal Soc. Arts 127 405/1  				The first stage in oil and gas exploration is usually in the form of seismic surveys. < as lemmas  | 
	
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