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