HR: 08:15h
AN: S41E-02    [Abstracts]
TI: Crustal Thickness Beneath Ocean Islands
AU: * Gao, S S
EM: gao@ksu.edu
AF: Kansas State University, Department of Geology, 108 Thompson Hall, Manhattan, KS 66506 United States
AU: Liu, K H
EM: liu@ksu.edu
AF: Kansas State University, Department of Geology, 108 Thompson Hall, Manhattan, KS 66506 United States
AU: Cullers, R L
EM: rcullers@ksu.edu
AF: Kansas State University, Department of Geology, 108 Thompson Hall, Manhattan, KS 66506 United States
AB: 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.
DE: 7200 SEISMOLOGY
DE: 7203 Body waves
DE: 7218 Lithosphere (1236)
DE: 7220 Oceanic crust
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: Fall Meeting 2005