Skip to main content

October 10, 2012 CIET Meeting at LDEO

 

CIET Conference Calls

 

Minutes 

The CIET, NSF and OBSIP OMO met at LDEO on October 10, 2012 for our annual face-to-face meeting.  The CIET meeting immediately followed an OBSIP IIC, OC, OMO meeting, thereby allowing us to benefit from those discussions.

Participants:

  • CIET:  Doug Toomey, John Collins, Bob Dziak, Susan Schwartz, Maya Tolstoy, Anne Trehu, William Wilcock
  • NSF:  Rodey Batiza, Donna Blackman,
  • IRIS OMO: Brent Evers 
  • Presentations by:  Spahr Web (LDEO), Andrew Barclay (LDEO), Vickin Ferrini (LDEO)

 

Formalize cruise report

Discussion focused on items to be included in all cruise reports.  Generally, these are all there for 2011 and 2012, except perhaps the clock drift corrections. We decided to not make a single template.

  • OBS Locations
  • OBS Drop/survey positions
  • OBS clock drifts as separate table
  • Notable events on deployments
  • CTD/XBT tables
  • Marine mammal surveys
  • Wind/weather in narrative

ACTION ITEM: Metadata for easy access 

Some metadata should be posted in an easy to find location, as opposed to within individual cruise reports.

  • Template for cruise reports
    • Clock drifts
    • Maps
  • Lat/lon/depth and consistency with IRIS data base
    • Draw from IRIS database and check against cruise report for consistency
    • Need to have a couple of different eyes check numbers

Summary of recovery and deployment cruises

We reviewed the 2012 field season, which included both deployments and recoveries.

  • Leg 1 needs 1 pager
  • Leg 2:  TRM recovery
    • Recovered 14 TRMS and 10 regular, 1 errant WHOI
    • Heave compensated winch is a MUST; great video of what happens to an TRM when a heave compensated winch is not available.
    • Rough handling clearly affects data quality; effectively throwing the instrument around.
    • Enormous amounts of biology and possibility for fish bumps, starfish clamped over release, preventing operation.
    • OBSs in shallow water become artificial reefs!
    • Lots of fish, go figure!  Great photos and videos.
    • For TRMs also have orientations from Jason/Medea, so it will be possible to check IRIS methodologies
    • It appeas as though a trawl hit one.  Gouge marks from trawling.  Stayed where it was left, so that is good.
    • 5 columbia undergrads participated and created a blog.  4 of 5 are now working at LDEO in this capacity.  
    • A TRM recovery cruise needs 2 chiefs and 6 students for Jason watches
    • Need a heave compensated winch.
  • Leg 3, SIO/Dziak
    • Went well, 2 undergrads, 2 MMOs and an educational coordinator participated.
  • Leg 4, WHOI/Wilcock/Hooft
    • 25 OBSs to deploy.  Only surveyed a few in order to save time.  Problems with G36, tried to recover. Deployed a second OBS at this site.  See cruise report.
    • Did not deploy lowest priority site, since 2 at G36
    • 2 Korean student (undergrad/grad student)
    • 2 other students
    • EdgeTech had poor quality control on burn wires; found 1/2 way through the deployment.
    • Got a new batch for Nabelek experiment.
  • Leg 5, SIO/Schwartz/Toomey
    • Deployed all 15 SIO OBSs
    • Interrogated 2 WHOI that did not respond
    • Surveyed 6 WHOI instruments
    • 3 grad students
    • 2 MMOs
  • Leg 6, LDEO/Trehu/McGuire
    • Heave compensated winch was fantastic
    • Flat and foggy most days.
    • 6-8 ft swells with TRM deployments
    • 5 from LDEO, one undergrad from OSU, recent grad from Stanford, WHOI grad, UO grad
    • 12 on, 12 off watches (2-2)  
    • 24 instruments (10 regular, 14 TRMs) 
    • Shallow high spots with bubbles, deeper did not.
    • Anne uses feed to MacGPS
    • Orca, Blue, Fin, porpoises, Barn owl, warblers in lab
    • LT/ST event detects vs water depth

 

Summary of Data Quality

LDEO

  • Important to close off Oceanus side by leaving CTD off the ship, otherwise waistdeck is awash.
  • 11 instruments with poor data
  • Deep systems consistently good
  • 3 TRM battery packs leaked
    • ​Violence on deployment caused many of the problems
    • Also shallow water has less pressure to hold end cap on. Held on by vacuum typically, so that if it leaks and is brought to shallow water the lithium reaction will push off the end cap.
  • 2012 Oceanus with heave-compensating winch in AHC mode.  
    • Worked extremely well
  • Good recording of Langseth data.
  • Oct. 31 for data to DMC
    • No hydrophones; APG
  • Navy data process
    • 5 OBSs analyzed.
    • Seismometer mini seed at sea.
    • APG miniseed code early Sept.
    • Redacted data expected in a few weeks
    • Very accomadating

WHOI

  • Navy redaction, 15 of 22 were of interest, redacted from 3 to 7%.  Three segments over a day long, most under 10 hours.  All data is now at DMC
  • 1 sps data is complete for redacted data
  • filtered data will go in this week
  • 100 s period.  Never re-leveled once on seafloor
  • Verticals are quite good
  • Data looks pretty good for the large events, Mw>7
  • Horizontals reasonable, but some odd noise of unknown origin
  • Blanco events look very good
  • Data archiving and availability
    • Navy
      • ​Are they pleased with situation
      • Post Navy policy on web site
      • Do they have most recent locations, etc?

SIO

  • SIO provided a report, to be posted her
  • DPGs appear to be quite noise 

Data Delivery to Community

Seismic Data

  • Current timelines
    • WHOI, redacted in, 4 hz one week later.
    • LDEO, Oct 31.
    • SIO, Dec 1 (maybe earlier)
  • Future policy
    • Goal is to turn it around more quickly.
    • Post mini seed data, one data set per instrument on the CIET web site
      • 4 Hz, Unfiltered, disk delivered dockside, to be delivered to UO and posted
      • Data removed once IICs post data at the DMC.
      • Readme, indicating that if data is being used its at ones own risk
      • <10GB per instrument

Bathymetry Data

  • Bathymetry
    • Chris Goldfinger’s data was meant to be supplied this summer.
    • Del’s grid includes this data; will post on CIET site
    • There are still tracks that are not yet included in GeoMapApp
    • Last summer, specific sites of interest were mapped.  Not merged into GMRT database
    • Dziak had data that has also been submitted to NGDC that is not yet included in GeoMapApp
  • Bathymetry update from Vick Ferrini (LDEO)
    • Goldfinger cruise is next on list
    • v2.3 coming out Oct 11, 2012
    • List to William, he will compare the spreadsheet
    • Will ping edit raw Goldfinger data and add this to the dataset

 

Facilitating Community Involvement

  • Announcement at GeoPrisms meeting
  • General call for participation via website
    • Could be hosted at GeoPrisms
    • Which cruises, reason for participation/statement
  • NSF deadlines
    • Feb 15 OCE
    • GeoPrisms/EarthScope, summer 2013
  • Opportunities for Cascadia
    • AGU session 2013
    • October meeting, OBS meeting in 2013.  Special interest groups
    • Special volume or issue
    • IASPEI July 2013 Sweden

Should year 3 focused rray be reoccupied?

When should this be discussed by the community.

Data QC and metadata 

  • Orientations, month or two after data is ready
  • IICs to do some amount of QA/QC
  • Run PQLx on database, provides statistical evaluation

2013 Proposal

  • Run as supplement; get it in January 2013

Announcements of data availability

  • Announce ASAP, with estimated times. Send to listservs (GeoPrisms, Earthscope, IRIS, COL, send to Rodey for NSF newsletter)

AASC

CIET met with G. Abers, chair of AASC.  Discussion of Grays Harbor focussed array, in particular, if rec. fcn. do not work, what should we do. Possibilities include redeploy to record seismicity, which raises questions:

  • Where would it go
  • Announce at workshop:
    • possibilities of moving instruments of northern focussed array
    • opportunity to look at data for May 12-15, Raleigh NC

Summary of Action Items

  1. Need a tally of all students involved
  2. Calculate transit times and make a request for additional ROV days.  Known and worst case scenarios; send to Rose/NSF ASAP
  3. Year 3, request XBTs, not CTDs.  Include in budget. Need 1000 m lengths, 500 m might be ok
  4. Layback length has changed; communicate to IICs
  5. Create a single Fisheries report for Oregon and N. California
  6. Request clock drift corrections
  7. Reporting of progress to the community.  Request information from IICs.
  8. Powerpoint for community, website information, videos, summary of data
  9. Post raw data on website in 2013
  10. Navy communication. Check to see that they are happy with the situaiton, do they have most recent locations, etc?
  11. Post Navy policy on the web site
  12. Post existing bathymetry grid on web site