Open AccessTwo‐dimensional analysis of the effect of subsurface anomalies on the free surface response to incident SH ‐waves
Author(s) -
Crichlow Joel M.,
Beckles David,
Aspinall William P.
Publication year - 1984
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1984.tb02237.x
Subject(s) - seismogram , geology , anomaly (physics) , seismology , free surface , surface (topology) , surface wave , seismic wave , position (finance) , geophysics , geodesy , geometry , optics , mechanics , physics , mathematics , finance , economics , condensed matter physics
Summary Two‐dimensional finite element modelling of subsurface anomalies at shallow depth has been done to obtain the response to incident SH ‐waves. Vertically incident SH and obliquely incident SH have been examined. Power spectral ratios were studied to determine the effect on the surface seismograms of the position, shape, depth, size and material composition of the anomaly. A number of relationships between the surface response and the anomaly has been identified. These relationships may be used in solving the inverse problem: given the seismic motion of the ground surface, determine the physical properties of the underground structure.