High-resolution offshore 3D seismic geophysical studies of infrastructure geohazards
As global earthquake activity continues to impact Communities, infrastructure, and lives, the necessity of better identification and characterization of seismic hazards becomes ever clearer. The tragic 2011 Tohoku, Japan earthquake and tsunami increased the attention on critical coastal infrastructure projects exposed to earthquake hazards. Offshore faults are more difficult to identify and characterize than onshore faults. While multibeam bathymetric surveys can reveal surface geomorphologic expression of faults, seismic source characterization studies also require investigations of fault geometry in the subsurface. High-resolution offshore geophysical surveys can be a highly valuable tool for these tasks. Specifically, the use of high-resolution three-dimensional seismic reflection investigations can provide some of the most precise information about fault location, activity, and geometry. This work will discuss how the latest generation of ultra-high-resolution/high-fidelity marine seismic systems can be used to investigate sub-sea faults, and how it applies to complex geologic hazards to coastal infrastructure.