Gas hydrate on the northern Cascadia margin: regional geophysics and structural framework
2006
Integrated Ocean Drilling Program Expedition 311 is based on ex-
tensive site survey data and historic research at the northern Cas-
cadia margin since 1985. This research includes various regional
geophysical surveys using a broad spectrum of seismic tech-
niques, coring and logging by the Ocean Drilling Program Leg
146, heat flow measurements, shallow piston coring, and bottom
video observations across a cold-vent field, as well as novel con-
trolled-source electromagnetic and seafloor compliance surveying
techniques. The wealth of data available allowed construction of
structural cross-sections of the margin, development of models
for the formation of gas hydrate in an accretionary prism, and es-
timation of gas hydrate and free gas concentrations. Expedition
311 established for the first time a transect of drill sites across the
northern Cascadia margin to study the evolution of gas hydrate
formation over the entire gas hydrate stability field of the accre-
tionary complex. This paper reviews the tectonic framework at
the northern Cascadia margin and summarizes the scientific stud-
ies that led to the drilling objectives of Expedition 311 Cascadia
gas hydrate.
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