LDEO IIC 2010-11

LDEO IIC 2010-11

• Summary of year’s activities– Forsyth/Wiens Recoveries– Cascadia Construction and TRM Deployment (testing)– Staffing

• Upcoming plans/schedule– Cascadia deep deployment (2011)– Mariana deployment (2012)– Chile deployment (2012)– Cascadia recoveries/turnaround (2012)

• Development– Completed/ongoing projects– Future projects

Forsyth Recoveries (S of Shatsky)

Site Depth, m Acoustics Release Data

14 6002 Good No release

12 5788 Good 1 wt dropped after ~2h 244/370

9 5933 Good 1 wt dropped after ~2h 150/370

8 6007 Good Normal release 372/372

5 5994 None

2 5752 None

Faulty burnwires: Sites 9, 12, 14?

Sites 2, 5: implosion or early release ?

Wiens Lau Recoveries

• 21 of 22 recovered• 13 had OBMs

• OK performance,• Some bad channels

• Depth restriction 5000 m• No low-pressure leaks

Inventories (instruments and people)

• ~29 standard OBS (5 TCs; 24 L4s)• 30 (20 TRM; 10 standard) in Cascadia fleet (considerable overlap in design)

• People: 3 core, 5 peak– Engineer Gassier– Engineer Koczynski– Technician Oletu– Technicians Stolzmann, Brusa

Cascadia Construction/Deployment

2 test cruises in LI Sound (battery issues; instrument survived 3’ drop)Corrosion test in LI sound

Made decision early 2011 to add popup buoys

Construction:

Possible TRM delays became apparent ~ April/May

Steel supplier/coater overwhelmed (19 tons in 900 pcs)

Estimated 5+ instruments ready for deployment cruise

10 standard Cascadia OBSs on track for October 2011

New standard OBS

TRM OBS

Cascadia Deployment

15 delivered for cruise

TRM Deployment Cruise July, 2011

15 deployed9 with popups

Heave challenges

1 TRM fell

1 tilted

1 recovered

Some had temperaturesensors

Major fishing collaboration

TRM Recovery

2011-12 Activities

• Cascadia Standard deployment, October 2011• Mariana experiment (Wiens) Jan/Feb 2011

– 10 standard OBSs– 5 moored instruments– Temperature sensors ?

• Chile experiment (Trehu) April/May 2011– 10 standard OBSs– Flowmeters

• Cascadia Recoveries/Turnaround [All summer…]

Completed Development

• Switched to Trillium Compact leveling system in Al tube

• TRMs developed and built• OBS dataloggers redesigned: batteries separated• APG dataloggers incorporated into OBSs• TRM deployment/recovery approaches

2011-12 Development Directions

• New FPGA for APG logger• Atomic clocks• TRM tweaks• Mariana moored instruments• Adding SIO flowmeters to standard OBSs • Incorporate broadband sensor• New OBS datalogger• Deep OBS

Issues

• Confidence has increased (5 years)• But… recognize need to consolidate.

• Last year, working flat-out. May be false economy given per-instrument and data costs.

• Data: Backlog is critical problem. First Forsyth

experiment site to DMC yesterday.