The shallow attenuation structure of the fast-spreading East Pacific Rise near 9 deg 30 min N

Details The shallow attenuation structure of the fast-spreading East Pacific Rise near 9 deg 30 min N The shallow attenuation structure of the fast-spreading East Pacific Rise near 9 deg 30 min N

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..321c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 5, p. 321-324

Physics

20

Mathematical Models, Mid-Ocean Ridges, Pacific Ocean, Sea Floor Spreading, Wave Attenuation, Boundary Layers, Crustal Fractures, Earth Crust, Power Spectra, Seismology

Scientific paper

Direct measurements of Q values in the shallow crust are difficult to obtain due to the lack of energy turning in this region. We analyze aunique data set consisting of seven refraction experiments carried out with both the source and receiver near the seafloor. This experimental geometry allows us to resolve the shallow compressional wave attenuation structure of young crust at the East Pacific Rise. All models depict a low-Q layer 2A (apparent Q = 11-22), and several models resolve a layer 2B with a much higher Q (apparent Q greater than 70). This structure is consistent with a layer 2A composed of extrusives overlying a layer 2B composed of sheeted dikes.

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