Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes

Details Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112304h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12304

Physics

Geophysics

2

Exploration Geophysics: Radioactivity Methods, Geochemistry: Geochronology, Marine Geology And Geophysics: Marine Sediments-Processes And Transport, Marine Geology And Geophysics: Marine Seismics (0935), Seismology: Paleoseismology

Scientific paper

Turbidite layers in surficial (<0.4 m) sediments of the southern Okinawa Trough and its vicinity were dated by 210Pb and further constrained by 137Cs and inter-site correlation of downcore profiles of particle size and porosity. Here we show striking temporal and spatial correspondence of such episodic deposits to large (ML > 6.8) submarine earthquakes recorded in the region since the 20th century. The repeating pattern of turbidite layers reported here on decadal to centennial time scales suggests what may be the long-term rhythm of seismic activities at this tectonically active plate boundary.

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