Physics – Geophysics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2525c&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 16, p. 2525-2528
Physics
Geophysics
9
Geodesy And Gravity: Crustal Movements-Interplate, Marine Geology And Geophysics: Instruments And Techniques, Tectonophysics: Plate Motions-Present And Recent, Geodesy And Gravity: Instruments And Techniques
Scientific paper
Direct-path acoustic measurements between seafloor transponders observed no significant extension (-10+/-14mm/yr) from August 1994 to September 1996 at the southern Juan de Fuca Ridge (44°40' N and 130°20' W). The acoustic path for the measurement is a 691-m baseline straddling the axial cleft, which bounds the Pacific and Juan de Fuca plates. Given an expected full-spreading rate of 56 mm/yr, these data suggest that extension across this plate boundary occurs episodically within the narrow (~1 km) region of the axial valley floor, and that active deformation is occurring between the axial cleft and the plate interior. A cleft-parallel 714-m baseline located 300 m to the west of the cleft on the Pacific plate monitored system performance and, as expected, observed no motion (+5+/-7mm/yr) between the 1994 and 1996 surveys.
Chadwell David C.
Hildebrand John A.
Morton Janet L.
Normark William R.
Reiss Carol A.
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