Imagerie sismique de haute résolution pour la prévention des risques volcanique et sismique

Abstract : THIS WORK IS METHODOLOGICAL AN EXPERIMENTAL AND FOCUSES ONT THE HIGH RESOLUTION SEISMIC IMAGING OF COMPLEX STRUCTURES ASSOCIATED TO VOLCANIC AND SEISMIC HAZARDS. WE DEVELOP AND APPLY NOVEL SEISMIC INVESTIGATION METHODS IN ORDER TO IMAGE SELECTED TARGETS. OUR OBJECTIVE IS TO GAIN SPATIAL RESOLUTION BY USING DENSE ARRAYS OF SOURCES AND SENSORS. THIS WORK IS MOREOVER CLOSELY RELATED TO THE RECENT DEVELOPMENT OF A NEW SEISMIC-SEISMOLOGIC ARRAY THAT ALLOWS CENTRALIZED MONOTORING OF THE DATA.
WE TAKE PART OF A PROJECT WHICH AIM IS TO STUDY THE SOUFRIERE OF GUADELOUPE VOLCANO IN ORDER TO PREDICT ITS ERUPTIONS. AS A PRELIMINARY STEP, WE FOCUS ON THE HIGH RESOLUTION SEISMIC IMAGING OF A STROMBOLIAN TYPE VOLCANO LOCATED IN CENTRAL FRANCE. WE IMAGE THE STUDIED SUB-KILOMETRIC SCALELENGTH STROMBOLIAN VOLCANO WITH A DECAMTRIC RESOLUTION. WE PROVE THE POTENCY OF OUR WORK IN ORDER TO IMAGE COMPLEX STRUCTURES AND THUS TO IMPROVE THE VOLCANIC HAZARD ASSESSMENT.
WE FURTHER FOCUS ON THE SEISMIC HAZARD ASSESSMENT AND STUDY THE NORTH-ANATOLIAN FAULT. WE OPERATED A REFLECTION SEISMIC PROFILE ACROSS THE FAULT. OUR RESULTS PROVE USEFUL FOR THE SEISMIC INVESTIGATION OF FAULT ZONES AND THE SEISMIC HAZARD ASSESSMENT IN NEAR FAULT AREAS.
THIS EXPERIMENTAL AND METHODOLOGICAL WORK CONFIRMS THE POTENCY OF USING DENSE ARRAYS OF SENSORS AND SOURCES IN ORDER TO IMAGE COMPLEX GEOLOGICAL STRUCTURES ASSOCIATED TO VOLCANIC AND SEISMIC HAZARDS.
Document type :
Theses
Geophysics. Université Joseph-Fourier - Grenoble I, 2006. French


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Contributor : Florent Brenguier <>
Submitted on : Monday, February 6, 2006 - 5:25:53 PM
Last modification on : Tuesday, February 7, 2006 - 8:49:21 AM

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Florent Brenguier. Imagerie sismique de haute résolution pour la prévention des risques volcanique et sismique. Geophysics. Université Joseph-Fourier - Grenoble I, 2006. French. <tel-00011546>

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