No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996
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Abstract
Direct-path acoustic measurements between seafloor transponders observed no significant extension (−10±14 mm/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±7 mm/yr) between the 1994 and 1996 surveys.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996 |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/1999GL900570 |
| Volume | 26 |
| Issue | 16 |
| Year Published | 1999 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 4 p. |
| First page | 2525 |
| Last page | 2528 |
| Google Analytic Metrics | Metrics page |