Accession Number : ADA305536

Title :   Detection and Identification of Small Regional Seismic Events.

Descriptive Note : Final rept. 24 Jun 93-28 Sep 95,

Corporate Author : MAXWELL LABS INC LA JOLLA CA S-CUBED DIV

Personal Author(s) : Bennett, Theron J. ; Barker, Brian W. ; Marshall, Margaret E. ; Murphy, John R.

PDF Url : ADA305536

Report Date : SEP 1995

Pagination or Media Count : 60

Abstract : Only very limited experience exists for regional seismic signals from small or decoupled nuclear explosions, which would be important in a CTBT monitoring environment. The goal of this research has been to enhance the experience base for such events at the prototype International Data Center (IDO) and to identify potential techniques and limitations of IDC seismic monitoring at the low magnitude levels appropriate to a CTBT. To accomplish this objective theoretical source scaling was used to scale the original records observed from underground nuclear explosions down to the levels appropriate to CTBT monitoring goals (e.g. 1 kt fully decoupled), and the scaled signals were reembedded into normal background noise conditions. We then analyzed the simulated records in the time and frequency domains to assess their implications for detection, location, and identification The regional signal characteristics for the scaled explosions can then be compared to similar behavior in signals from small events of other source types In a separate study under this contract, we also investigated regional seismic identification techniques for some specific events recently detected by the IDC.

Descriptors :   *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, MONITORING, PROTOTYPES, SCALING FACTOR, DECOUPLING, SEISMIC WAVES, ARMS CONTROL, RECORDS.

Subject Categories : Seismic Detection and Detectors
      Government and Political Science
      Nuclear Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE