Two-thirds of the Earth's surface is covered by oceans, which represents a considerable challenge to investigations of global-scale dynamic processes in the Earth's interior and of tectonic processes at ocean-continent boundaries. Long-term ocean-floor observations are also necessary to better constrain regional tectonics, such as on the western margin of North America where tectonics and seismic activity do not stop at the continental edge. In northern California, for example, the most active seismic zone is near the Mendocino triple junction and is mostly offshore, as are a number of hazardous faults such as the San Gregorio and Hosgri faults and part...

First Page Preview

First page PDF preview
You do not currently have access to this article.