Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..395h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 5, p. 395-398.
Physics
2
Earth Movements, Earthquakes, Free Vibration, Seismic Waves, Vibration Mode, Crustal Fractures, Seismographs
Scientific paper
Free oscillations excited by the 1989 Macquarie Ridge earthquake were recorded by a local broadband seismograph network. Amplitude patterns of the earth's free oscillations vary rapidly across short distances and provide information about seismic sources. The apparent centroid location for the Macquarie Ridge earthquake was estimated by searching a minimum misfit between the observed and theoretical initial amplitudes. It is shown that local network observations can be used for a simple estimation of centroid location along the direction parallel to the epicenter-station path by utilizing the sensitivity of multiplet amplitudes to distance. Results indicate that local networks of broadband stations are useful for the analysis of local, regional, and teleseismic events.
Fukao Yoshio
Hirahara Kazuro
Hori Sadaki
Ishihara Yasushi
Shibutani Takuro
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