Instrument Deployments

During the USGS study, instrumented tripods were deployed and recovered at LT-A three times each year, typically in February, May or June, and September. This report presents photographs obtained during 19 deployments that took place during the period October 1996 through September 2005. The deployments are identified by a three-digit USGS mooring number that is assigned sequentially to all instrument deployments (table 2). The camera on tripods 632 and 708 failed to operate. Because of camera and strobe failures, systems were not available to be deployed on tripods 611, 645, 683, 697, and 756 (table 1).

Each tripod was located near the USCG Boston Approach B Buoy (National Ocean Service, 1997) on the southern flank of a ridge in water about 32 m deep (fig. 8). This location was selected for long-term observations because the USCG buoy marked the site and provided some physical protection from other marine activities.

Table 2. USGS mooring number, date, location, and water depth of time-series photographs contained in this Data Series report.

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Table 1.

Figure 8.