Crustal Thickness beneath Ocean Islands
Abstract
We measured the thickness of the Earth's crust beneath about two dozen of the GDSN or GEOSCOPE stations located on ocean islands by stacking moveout-corrected high-quality P-to-S receiver functions (RFs). The RFs were filtered in the 0.05-0.5 Hz frequency bands to compress strong noises that are common for ocean island stations. Given the small (less than 2 s) time separation between the direct P and the P-to-S converted phase from the Moho, the PSmS phase, which has a negative polarity and can be clearly observed at almost all the stations, is used for the stacking. Preliminary resulting thickness at each of the stations is as follows: AFI (12.4 km), AIS (13.6), ASCN (9.6), BBSR (9.9), BORG (9.4), CRZF (6.6), GUMO (8.0), HNR (8.0), HOPE (19.0), KIP (13.0), MSEY (10.7), MSVF (15.1), NOUC (15.1), PAF (8.9), POHA (17.0), PPT (12.3), PTCN (10.4), RAR (12.8), RER (13.8), RPN (9.3), SEY (14.9), SHEL (17.5), TBT (14.1), XMAS (11.8). Crustal thickness at some of the stations has been measured previously, and our results are in general agreement with those measurements. Possible age-dependence of the resulting thickness and geological implications in the understanding of plume-lithosphere interactions and formation of ocean islands will be presented.
Recommended Citation
S. S. Gao et al., "Crustal Thickness beneath Ocean Islands," Eos, Transactions American Geophysical Union, vol. 86, no. 52, American Geophysical Union (AGU), Dec 2005.
Meeting Name
AGU Fall Meeting (2005: Dec. 5-9, San Francisco, CA)
Department(s)
Geosciences and Geological and Petroleum Engineering
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2005 American Geophysical Union (AGU), All rights reserved.
Publication Date
01 Dec 2005