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.
Suggested Citation
Chadwell, C., Hildebrand, J.A., Spiess, F.N., Morton, J.L., Normark, W.R., and Reiss, C., 1999, No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996: Geophysical Research Letters, v. 26, no. 16, p. 2525-2528, https://doi.org/10.1029/1999GL900570.
| 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 |
| Publication Date | August 15, 1999 |
| Year Published | 1999 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 4 p. |
| First page | 2525 |
| Last page | 2528 |