Data access and related issues in seismic imaging of the Earth's
deep interior
Barbara Romanowicz Institut de Physique du Globe de Paris,
Collège de France Univ. of California, Berkeley
ERC advanced grant “WAVETOMO”
Convective Currents
in the Earth’s mantle
P S
Surface waves
Loma Prieta (CA) 1989 M 7 earthquake observed at KEV, Finland
SS
50 mn
Imaging the earth’s interior using seismic waves
(hot) (cold)
The age of numerical wavefield simulations
Observed
calculated Spectral Element Method and the “cubed sphere”
– Founded in 1985
– Established design standards for broadband seismic instrumentation
– Established a standard format for the exchange of data (SEED – Standard for Exchange of Earthquake Data)
– Encourages the coordination of national and international data centres. • IRIS DMC (Data Management Center) in the USA • ORFEUS Data Center in Europe • Plans for 3rd global data center in Japan or Australia • Digital data freely available through Internet in
standardized formats
International Federation of Digital Seismograph Networks
• In the US: – IRIS DMC (funded by NSF)
• centralized data center • US national regional and global networks and also hosts FDSN data
collections since the 1980’s
– Northern California Earthquake Data Center (funded by USGS/UC Berkeley)
• In Europe: more heterogeneous landscape – ORFEUS data center – Towards a distributed data system – Currently under construction
• The rules (at least in US):
– Data from permanent nationally funded networks freely and
immediately available, – Data from temporary PI-lead deployments are hosted in the
IRIS DMC, but usage restricted for the first 2 years
EIDA: The European distributed data archive for Seismology
• EIDA Goals: – safe, persistent archival and dissemination of high
quality seismic waveform data collected by European datacenters via distributed archives
– easy access for scientists - support multiple access methods, standards
– open access where possible, closed / restricted access is possible
– all stations require standardised metadata
– distributed archives allows robust system independent of each individual node
EIDA: More than just data
• Coordination of data holdings
• Coordination of software/strategic developments
• Provides quality control of data/ metadata
• Helps define seismological center “best practice” for ORFEUS community – Planning for next generation software (scalability,
interoperabiity, compliance with standards) – Extension to other types of geophysical data
• EIDA is the seismological branch of (EPOS-S)
EPOS = European Plate Observing System
• Long term integration plan of research infrastructures for solid Earth Science in Europe – Geophysical monitoring networks – Experimental & analogue laboratories in Europe – Local observatories
• EPOS will give open access to geophysical and
geological data and modeling tools, enabling a new era in multidisciplinary scientific research
• Preparatory Phase project (2010-2014)
Issues
• Some political issues – Related in particular to use of seismic
networks for monitoring nuclear tests – e.g. China, India
• Mostly issues related to funding channels
– Need for attribution – Solution: DOI, enforcement of
acknowledgment of data source in publications – Financial support for local organizations to
produce the last step: provide nationally funded data to the archive.
Thank you for your attention
Japon, 2011
New Zealand 2010,2011
Haiti, 2010
Chili, 2010
Sumatra, 2004