To aid in the search and location of the data pertinent to a specific 

 site under investigation, a listing of possible sources of oceanographic data 

 has been prepared and is presented as Table A-4. Information, such as that 

 shown in Figure 10, is collected as background information for various experi- 

 ments. Often, these data are not published. In many cases, the existing data 

 are sufficient for placement of a particular structure. In other cases, only 

 supplemental measurements may be required in the detail survey phase. 



Much information of scientific interest in the areas of geological and 

 biological characteristics can be found in various publications. Data obtained 

 for oil exploration or other engineering-oriented services, however, are usually 

 not published. As an example of published information, during the period 

 June-July 1 967, Geotech 18 conducted a continuous seismic reflection survey 

 from Trinidad to South Africa over a route totaling 7,000 miles. It is probable 

 that if the profile includes areas of interest for a particular structure, the 

 records could be purchased. Existing geological and biological data may also 

 be available for other specific areas of interest. To facilitate the search for 

 this data, Table A-5 for geological properties and Table A-6 for biological 

 properties have been prepared. 



Weather information is collected daily at various locations throughout 

 the world and is generally available. The data on surface effects resulting from 

 the influences of the weather, however, may not be readily available. To 

 facilitate the search for this information on weather and surface effects, a 

 listing of possible sources for these data has been prepared and is presented 

 as Table A-7. 



Contained in Table A-8 is a listing of possible sources for information 

 on earthquakes and earthquake effects. Information such as shown in Figure 1 1, 

 which is a plot of earthquake epicenters occurring in the Southern California 

 offshore area, is available for various oceanic regions. This information, in 

 addition to being required for design of the structure, could be one of the 

 controlling factors in the selection of candidate sites. Since it is not possible 

 to gain epicenter location and other data on earthquake effects in the detail 

 survey phase, it is necessary to rely chiefly on available historial information. 

 Thus, the search for this information must be made in the preliminary survey 

 phase. 



Investigation of existing information is essential. In general, the 

 purpose of locating these existing data is twofold: (1) to determine if exis- 

 ting data are adequate for selecting a site and placement of the structure, 

 and (2) if not, to determine which parameters require assessment in the 

 detail survey phase. 



