Open AccessModelling Local Seismograms of French Nuclear Tests In Taourirt Tan Afella Massif, Hoggar, Algeria
Author(s) -
Gaffet S.,
Massi B.,
Plantet J.L.,
Cansi Y.
Publication year - 1994
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1994.tb04028.x
Subject(s) - seismogram , massif , geology , amplitude , azimuth , seismology , phase (matter) , reflection (computer programming) , nuclear test , nuclear explosion , field (mathematics) , geophysics , test site , optics , paleontology , physics , mathematics , quantum mechanics , computer science , nuclear physics , pure mathematics , programming language
SUMMARY The influence of topography on the shape and amplitude of seismograms recorded at short distances is investigated for a set of nuclear explosions detonated in the Taourirt tan Afella mountain, Hoggar, Algeria, which was the French nuclear test site during the 1960s. the wavefield observed on one side of the mountain compared to that on the other shows a large‐amplitude phase generated by reflection of the direct field inside the mountain. This phase is back‐diffracted and can be seen in one azimuth and not in the opposite. the existence of such a phase depends on the source location inside the mountain. the amplitudes of standard phases are also modified with a factor of 2.5 by the topography between observations made in one azimuth compared to the others.