Marine Geoscience Digital Seismic Data System

Access for education and research

Field Data Center (LDEO)Marine Seismic Data Center (UTIG)

October 2007

Scope and Goals

• Preserve U.S. academic digital seismic reflection data and supporting information

• Help investigators share project data and products• Help define and unify seismic-related metadata• Promote improvements in comprehensive seismic data discovery

October 2007

MSDC Home

October 2007

FSDC Home

October 2007

Seismic System Components

• Field Seismic Data Center (LDEO)– serves digital field data

• R/V Ewing 57 cruises 1990-2005• R/V Langseth (operational January, 2008)

• Marine Seismic Data Center (UTIG)– serves digital seismic products

• stacks, migrations, SCS, UTIG OBS, 3-D, 3.5 kHz, chirp– serves field data from 86 cruises (mostly UTIG)– serves other types of ‘seismic’ data not otherwise being preserved

October 2007

Soliciting Digital Seismic Data– organize project history, acquisition, processing and publication

information in FGDC-compliant relational database– create trace geographic positions, line-by-line– trace locations inserted into SEGY binary data– create annotated raster images

Cruise-organized metadata

October 2007

User Interaction• View and select SEGY, images, navigation

- map-based search- metadata-based search- Google Earth files with image links

• External access to metadata- xml metadata evaluation with Lamont- web map service support (www.ig.utexas.edu:8080/geoserver/wms)- GeoMapApp links

• Custom seismic images• Automated download cart

October 2007

Custom Images

• create custom images with window selection, aspect ratio, filtering and amplitude control.

• produces gif and pdf files.

October 2007

Google Earth with Image Links wxww.ig.utexas.edu/sdc/web_services/ReflectionSections_v1.kmz

October 2007

Cumulative Contents 26,073 SEGY Files

Year ending Cruises‘Processed’SEGY Files

Field SEGY Files

2001 1,193 14,697

2002 4,798 16,028

2003 5,171 16,049

2004 6,007 16,148

2005 6,966 16,149

2006 161 8,109 17,068

Sept 2007 177 8,533 17,540

October 2007

User Activity 795 Registered Users

Year ending New registered users

File transfers*

Total Download

(GB)

2001 25+

2002 65+

2003 130 1,116 29

2004 116 1,969 60

2005 138 8,362 283

2006 160 11,341 443

Sept 2007 161 16,275 439

*”small” image downloads not monitored +estimated before start of cart system

October 2007

Downloads by Data Types 37,946 files, 1.224 TB (since July 2004)

Type Files Volume (GB)

Large images+ 6,253 9

Trace locations (nav) 16,182 8

SEGY:

Shot 5,315 515

Stacks & Migrations 6,684 540

3-D migrations 87 60

OBS 1,236 77

Total SEGY 13,363 1,131+ not all image downloads monitored

October 2007

Data Discovery--Alaska

October 2007

From Jon Childs

October 2007

Challenges to Comprehensive Seismic Discovery

• Differing institutional priorities– just for U.S. seismic data

• at least 6 institutions with seismic data, plus Antarctic Data Library• funding, individual priorities and institutional priorities vary widely,

and some will never participate• Differing ‘metadata’ inhibits discovery

– for example, navigation not specific to each line but instead for the entire cruise, whether seismic collected or not

• Differing tools/methods for discovery among centers• WMS/WFS large files (slow unless windowed or decimated)• Google Earth virtual globe (commercial product limitations)

– well-known educational and cross-generational browser– data center controls information in the placemark, has complete

‘ownership’ control

October 2007

Digital Marine Seismic Data• Major U.S. data centers Projects

• Other– Antarctic seismic library (includes many U.S. not included in the

above list) ~ 100– Other U.S. digital ‘seismics’ > 120

• hull mounted chirps, small portable systems chirp, seismic, 3.5kHz (lakes and ocean)

USGS (e.g., Lee, WesternGeco, Chevron) >> 200NSF (LDEO & UTIG) ~ 200NGDC (plus MMS released) ? 100SIOSEIS (Ewing, Conrad, Washington) ~ 30SIOExplorer (Melville, Revelle) < 30IRIS marine (plus more terrestrial) ~ 25

MMS unreleased digital projects >>? 3,000

October 2007

Challenges to Seismic Data Centers• Soliciting contributions post-cruise (‘processed data’)

– requires connection between contributor-data center and contributor-user, including proper acknowledgment of PI investments by end-users

• which is at odds with higher-purpose science tools, which to be effective, sever connection to contributors

• Funding model– must assume limited 3-5 year life– careful monitoring of use activities a necessity for refunding

• which is at odds with sharing data• for example, wholesale incorporation of data into other science tools

that don’t have monitoring for contributor connections (like GMA, LOS, regional data bases)

• But tremendous progress from 1999 and 2001 workshops