Source distribution of ocean microseisms and implications for time-dependent noise tomography     

Sharon Kedar 《Comptes Rendus Geoscience》2011,343(8-9):548-557

A qualitative analysis of ocean microseism source distribution observed in North America during fall and winter months was carried out. I review the theory of the origin of ocean microseisms and show that it can be used in conjunction with wave-wave interaction maps to quantify the source distribution anisotropy. It is demonstrated that microseisms generation in the North Atlantic and in the North Pacific Oceans are inherently different. North Atlantic microseisms are generated predominantly in the deep ocean, while North Pacific microseisms are dominated by coastal reflections. In spite of these differences both result from repeated ocean wave patterns that give rise to an anisotropic noise pattern, which cannot be randomized by time averaging. Considering time-varying ambient noise imaging, which aims to resolve a fraction of a percent changes in the crust over short distances, the source anisotropy would introduce a relatively significant error that needs to be accounted for.  相似文献   

Earthquake Response of Ring Foundation in Cohesionless Soil     

Birid  Kedar  Choudhury  Deepankar 《Geotechnical and Geological Engineering》2022,40(8):4269-4288

Geotechnical and Geological Engineering - Ring foundations are commonly adopted to support tall and heavy cylindrical structures such as silos, chimneys, cooling towers, circular storage tanks, and...  相似文献