Source location of the 26 sec microseism from cross-correlations of ambient seismic noise

Details Source location of the 26 sec microseism from cross-correlations of ambient seismic noise Source location of the 26 sec microseism from cross-correlations of ambient seismic noise

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3318310s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 18, CiteID L18310

Physics

13

Seismology: Surface Waves And Free Oscillations, Seismology: General Or Miscellaneous

Scientific paper

Very strong, narrow band Rayleigh wave arrivals peaking near 26 sec are observed in cross-correlations of long time sequences of ambient noise records on US, European, and African stations with apparent arrival times that are typically smaller than expected for propagation along the great-circle linking the stations. Use of these apparent travel times to locate the source of narrow band arrivals shows that the waves originate off the west African coast in the Gulf of Guinea and propagate with an average speed of about 3.5 km/s; i.e., close to the expected group speed of Rayleigh waves at this period. Using data from different months demonstrate that the source location is temporally stable with amplitudes that maximize during the southern hemisphere winter. A microseism with similar features but with a slightly broader spectral peak is observed at stations in East Asia and in the western Pacific, and apparently originates in the North Fiji Basin. The nearly antipodal location of the two source regions leads to the hypothesis that the 26 sec signals are excited by a single source located in the Gulf of Guinea. The Pacific inter-station cross-correlations may be for major-arc propagation.

Affiliated with

Also associated with

No associations

Rating

Source location of the 26 sec microseism from cross-correlations of ambient seismic noise does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Source location of the 26 sec microseism from cross-correlations of ambient seismic noise, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Source location of the 26 sec microseism from cross-correlations of ambient seismic noise will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1079532