GEOSCOPE and GEOSS

JEAN-PA

Jean-Paul Montagner , Geneviève Roult

Dept. Sismologie, I.P.G., Paris; France

E.O.S.T., Strasbourg; I.R.D., C.E.A./DASE;

I.P.E.V.; C.N.E.S.

GEOSCOPE: state-of-the-art

- launched in 1982- goal: 25 VBB stations => 30 (FDSN Standards)- active member of FDSN

- New challenges: Quality not Quantity- Evolution: Science-driven Program -> Delivery of Benefits to Society (GMES, GEOSS) -> New Services

GEOSCOPE, typical network faced to new mandates

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GEOSCOPE▲ FDSN

GEOSCOPE and FDSN (GNSN?)

GEOSCOPE DATA CENTERhttp://geoscope.ipgp.jussieu.fr

INTEREST ININTEREST INMULTIPARAMETER STATIONMULTIPARAMETER STATION

Multiparameter Stations

 

Spectrum after correction of atmospheric pressure effect clearly shows free oscillation peaks of the Earth.

(Roult & Crawford, 2000)

beofre correction of atmospheric pressure

After correction of atmospheric pressure

0Sl

l

Coordination with other fields in geo-environment

I.O.N. (International Ocean Network) -> O.R.I.O.N.

Ocean Bottom Observatories

 NERO Ninety East Ridge Observatory

partnersIPGP/JAMSTEC/IFREMER

Station NERO

NERO observatory (in 2008)

GEOSC0PE and SCIENCE

- Structure of the Earth

- Seismic sources

Importance of very long period data(successor to STS1?)

Study of Sumatra earthquake (26 december 2004)

GEOSCOPE and Source Investigations

(Roult and Clévédé, 2005 ; Park et al., Science, 2005)

Sumatra-Andaman earthquake26 December 2004

53.9’

44.2’

20.9’ r=0.05mm

0T2

2S1

0S30S2

0T4

1S2

0S5

0S0

0S4 3S1 2S2

1S3

0T3

35.6’

STS1

Estimation of the Sumatra earthquake size Roult & Clévédé

mode 0S0

mode 1S0

= 60° pour 0S0,

~119° pour 1S0

t ~ 200s, 1200km

f = 0.8146 mHz

f = 1.6292 mHz

= t0bf

- t0

hf)

rapport data/synth

~2.01 pour 0S0

~1.60 pour 1S0

J.Park

NERO

IOTWS (Indian Ocean Tsunami Warning System) for South-West Indian Ocean

GEOSCOPE AND GEOSSGEOSCOPE AND GEOSS

- 30 VBB stations (FDSN standards)- Data freely accessible- Strong involvement in CTBT, NERIES- Participation to IOTWS (Indian Ocean Tsunami Warning System) for SWIO

Goals:• To complete multiparameter stations (for geo-environment), real-time transmission• Extension toward ocean (and toward space),• Early warning system.• New VLP seismometer.

G E O S C O P E G E O S C O P E EEOOSSSS

NEW CHALLENGE:

- To continue Instrumental and Basic Research. - To deliver new products, services and benefits to Society in the framework of GMES and GEOSS.

Constant Budget and Personnel?

Difficult but exciting task for GEOSSCOPE!

Daily spectrum

before pressure correction

Daily spectrum

After pressure correction

Roult & Crawford, 2000

the ‘Seismic Hum’à TAM/Tamanrasset de 1994 à 1998

fréquence (mHz)

1998

1997

1996

1995

1994

1998

1997

1996

1995

1994

fréquence (mHz)