Open AccessRegional variations of higher Rayleigh‐mode phase velocities: a spatial‐filtering method
Author(s) -
Cara Michel
Publication year - 1978
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1978.tb04268.x
Subject(s) - rayleigh wave , geology , dispersion (optics) , rayleigh scattering , mode (computer interface) , phase (matter) , seismology , geodesy , phase velocity , variation (astronomy) , surface wave , optics , physics , quantum mechanics , computer science , astrophysics , operating system
Summary. Application of both spatial filtering and multiple‐frequency filtering techniques allows one to isolate a higher‐mode surface wave and to find the regional variation of its dispersion. The method is applied to four sets of long‐period records across the United States for intermediate earthquakes located in the New Hebrides. The first and second higher Rayleigh modes show lower phase velocities in the western part of the States than in the eastern part. Furthermore, an oceanic phase‐velocity curve is determined between 50 and 130 s for the first higher Rayleigh mode on the full path across the Pacific Ocean.