-4. collection and interpretation of data in a scientific manner, | The history of the Atomic Energy Commission nuclear explosion program since 1945 shows a steadily growing fund of seismic data whose precision and reliability are incomparably superior to any data collected prior to that date. For example, a direct result of applying these data to earthquake problems has been improvement in the knowledge and accuracy of seismic travel times from source to observatories throughout the world. Let me give you an example. When an earthquake occurs in California, stations throughout the world record the seismic wave arrivals with an accuracy of about 0.1 seconds. Data of this kind from several large nets of seismic obser- vatories in various parts of the world have been compiled and afford the basis of improved travel time tables. of the earth's crust. These cover major segments Compilation of the data and their publication are performed by a number of contributing organizations. The Inter- national Seismological Summary is one repository of these data. The U. S&S. Coast and Geodetic Survey at Washington, the International Central Seismological Office at Strasbourg, France, are other examples of international cooperation among seismologists. During the International Geophysical Year, 1957-1958, worldwide cooperative programs were conducted. These data have been published and form a further contribution to the science of seismology and solution of earth problems. DOE ARCHIVE These data are mainly derived from observations of earthquakes. Although travel times may be measured to an accuracy of 0.1 seconds, there is always some uncertainty regarding the location of an earthquake, ZY