Coherence of dispersed synthetic strong earthquake ground motion at small separation distances

• Published in: Soil dynamics and earthquake engineering (1984) 2015-03, Vol.70, p.1-10
• Main Authors: Ding, Haiping, Trifunac, Mihailo D., Todorovska, Maria I., Orbović, Nebojša
• Format: Article
• Language: English
• Subjects: Coherence; Coherency of deterministic dispersed waves; Coherency of synthetic strong motion body and surface waves; Dispersions; Earthquake engineering; Flat surfaces; Grounds; Separation; Similarity of strong motion at surface stations less than 100 m apart; Soil (material); Translations
• ISSN: 0267-7261; 1879-341X
• DOI: 10.1016/j.soildyn.2014.11.010

It is shown that the observed loss of coherency of synthetic strong motion on ground surface for separation distances less than about 100m can be described in terms of the dispersion of strong motion waves. Additional contributions to the loss of coherency from variations of material properties in the soil and from geometrical departures from perfectly flat ground surface and irregular layer geometries are not considered in this paper. It is also shown that the synthetic surface displacements over a large rectangular area (100×100m) on ground surface can be described well by a flat surface undergoing translations and rotations only, and with only minor departures from the plane flat surface. •Coherency of strong earthquake ground motion for short separation distances.•Role of dispersion on coherency of earthquake wave motions.•Displacements of soil beneath large foundations.•Coherency of synthetic body and surface waves in parallel layers.