Accession Number : ADA019428

Title :   Tectonic Strain Release by Underground Nuclear Explosions.

Descriptive Note : Final rept. 1 Oct 73-30 Jun 75,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH AND PLANETARY SCIENCES

Personal Author(s) : Toksoz,M. Nafi

Report Date : 01 SEP 1975

Pagination or Media Count : 241

Abstract : Static and dynamic methods are developed to study the elastic field produced by earthquake faulting. An earthquake is considered as the slip on a planar fault due to frictional instability. The dynamics of a circular fault model is considered as a circular rupture front that expands subsonically from a nucleation point until it suddenly stops at its final radius. It was found that both the final slip on the fault and the rise time are zero on the edge of the fault and reach their maxima at the center of the fault. This slip-time history is quite different from that of the usual Haskell model where slip and rise time are assumed constant over the fault. The far field radiation due to this fault model was studied. A new method to compute the static near field of a shallow earthquake was developed.

Descriptors :   *Earthquakes, *Faults(Geology), Nuclear explosions, Tectonics, Strain(Mechanics), Displacement, Earth models, Finite element analysis, Rupture, Fourier analysis, Friction, Seismic waves, Far field, Sources, Deformation, Seismology

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE