Surface waves in strong ground motion with application to offshore environments
Abstract
Synthetic seismogram techniques are used to determine the characteristics of one to ten second period strong ground motion due to seismic surface waves. Of particlar interest is the response of offshore geologies, for which little or no strong ground motion data exist. Theoretical responses were computed for a continental shelf-like crustal model and an onshore crustal model and compared. The synthetic offshore motions have larger peak velocities, longer durations and larger spectral response. Over much of the period range of interest, the large response is independent of the site soil characteristics and due to the velocity gradients of the rock structure. This suggests that the use of average onshore response characteristics adjusted only for local soil conditions may not be adequate for specifying design characteristics offshore. Site specific studies accounting for both the local rock and soil properties are probably necessary.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1981
- Bibcode:
- 1981PhDT........32S
- Keywords:
-
- Continental Shelves;
- Dynamic Response;
- Earth Crust;
- Earth Movements;
- Seismic Waves;
- Seismology;
- Shorelines;
- Structural Properties (Geology);
- Surface Waves;
- Wave Propagation;
- Amplitudes;
- Displacement;
- Ocean Bottom;
- Offshore Platforms;
- Rocks;
- Sedimentary Rocks;
- Sediments;
- Seismograms;
- Soils;
- Velocity Distribution;
- Geophysics