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Accurate Hypocenter Determination in Lesser Antilles Region from the Sismantilles I Experimen
Author(s)
Type
Extended abstract
Language
English
Obiettivo Specifico
3.2. Tettonica attiva
Status
Submitted
Conference Name
Issued date
April 3, 2012
Conference Location
Saint Petersburg, Russia
Abstract
In this study, we present results of the investigation programme SISMANTILLES I, conducted from November 1999 to January 2002, on the Lesser Antilles Arc. We analyzed seismicity by using the data recorded by a combined on- and offshore network that integrated the local volcano-seismological observatories of the Institut de Physique du Globe de Paris (IPGP). The SISMANTILLES I landward network comprised 43 three-component temporary stations. To improve azimuth coverage in earthquake location, it was complemented by 31 OBS.
A data-set of 155 well located earthquakes has been used to study the relationship between tectonic structures and seismicity. In particular, to obtain precise hypocenter locations, we applied the concept of minimum 1D model which incorporates the iterative simultaneous inversion of velocity and hypocenter parameters. To partly estimate the huge structural heterogeneity of the Lesser Antilles Subduction Zone, the minimum 1D model is complemented by station corrections which take into account near surface velocity heterogeneity. The relocated hypocenters improve our knowledge on the subduction zone since they have smaller uncertainties with respect to the permanent array locations. The vertical depth sections, perpendicular to the arc, will help define the slab structure and the dip angle.
A data-set of 155 well located earthquakes has been used to study the relationship between tectonic structures and seismicity. In particular, to obtain precise hypocenter locations, we applied the concept of minimum 1D model which incorporates the iterative simultaneous inversion of velocity and hypocenter parameters. To partly estimate the huge structural heterogeneity of the Lesser Antilles Subduction Zone, the minimum 1D model is complemented by station corrections which take into account near surface velocity heterogeneity. The relocated hypocenters improve our knowledge on the subduction zone since they have smaller uncertainties with respect to the permanent array locations. The vertical depth sections, perpendicular to the arc, will help define the slab structure and the dip angle.
References
DeMets, C., Jansma P. E., Mattioli G. S., Dixon T. H., Farina F., Bilham R., Calais E. and Mann P. [2000] GPS geodetic constraints on Caribbean-North America plate motion. Geophysical Research Letters, 27, 437-440.
Bengoubou-Valerius, M., Bazin, S., Bertil, D., Beauducel, F. and Bosson A. [2008] CDSA: a new seismological data center for the French Lesser Antilles. Seismological Research Letters, 79, 90-102.
Dorel, J. [1981] Seismicity and seismic gaps in the Lesser Antilles arc and earthquake hazards in Guadeloupe. Geophysical Journal of the Royal Astronomical Society, 67, 679-696.
Kissling, E., Ellworth W.L., Eberhart-Phillips D. and Kradolfer U., [1994] Initial reference models in local earthquake tomography. Journal of Geophysical Research, 99, 19,635−19,646.
Laigle, M., Becel, A., Kopp, H., Lebrun, J-F, and Klaeschen, D. [2010] Along-arc segmentation and interaction of subducting ridges with the Lesser Antilles Subduction forearc crust revealed by MCS imaging. EGU General Assembly, Vienna, Austria.
Bengoubou-Valerius, M., Bazin, S., Bertil, D., Beauducel, F. and Bosson A. [2008] CDSA: a new seismological data center for the French Lesser Antilles. Seismological Research Letters, 79, 90-102.
Dorel, J. [1981] Seismicity and seismic gaps in the Lesser Antilles arc and earthquake hazards in Guadeloupe. Geophysical Journal of the Royal Astronomical Society, 67, 679-696.
Kissling, E., Ellworth W.L., Eberhart-Phillips D. and Kradolfer U., [1994] Initial reference models in local earthquake tomography. Journal of Geophysical Research, 99, 19,635−19,646.
Laigle, M., Becel, A., Kopp, H., Lebrun, J-F, and Klaeschen, D. [2010] Along-arc segmentation and interaction of subducting ridges with the Lesser Antilles Subduction forearc crust revealed by MCS imaging. EGU General Assembly, Vienna, Austria.
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