Deep crustal structure of the Tuamotu plateau and Tahiti (French Polynesia) based on seismic refraction data

Details Deep crustal structure of the Tuamotu plateau and Tahiti (French Polynesia) based on seismic refraction data Deep crustal structure of the Tuamotu plateau and Tahiti (French Polynesia) based on seismic refraction data

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n...1p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 1-1, CiteID 1656, DOI 10.1029/2001GL013913

Physics

Geophysics

3

Exploration Geophysics: Oceanic Structures, Exploration Geophysics: Seismic Methods (3025), Geodesy And Gravity: Local Gravity Anomalies And Crustal Structure, Tectonophysics: Dynamics, Gravity And Tectonics

Scientific paper

In French Polynesia, the young (<5Ma) Society Islands appear to result from intraplate volcanism, while the old (>50 Ma) Tuamotu plateau was likely created at or near the ridge axis. The structure of the crust between those two archipelagoes is constrained by a 300 km long refraction seismic profile. Crustal and upper mantle arrivals recorded by 6 OBHs and 3 land stations were used to provide a 2D model of the crust. Results of our study, combined with that of Grevemeyer et al. [2001] show a slight flexure below the Tahiti apron, while a deep crustal root (21 km) underlies the Tuamotu plateau. These structures reflect the different modes of load emplacement and compensation mechanisms between these two volcanic edifices, consistent with an increasing elastic thickness of the oceanic lithosphere with age.

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