Download Advances in Geophysics, Vol. 49 by Renata Dmowska PDF

By Renata Dmowska

A transparent exposition of the new release T waves by means of earthquakes, the tension accumulation version, and seismic ray tracing and wavefront monitoring in laterally heterogeneous media.

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In particular, they showed that T -wave duration keeps growing with seismic moment, even for the very largest seismic events (Alaska, 1964; Chile, 1960). Consequently, Okal and Talandier (1986) suggested the use of T phase duration as an indicator of the tsunamigenic potential of large earthquakes, with a threshold of 100 s for the excitation of a destructive transoceanic tsunami (M0 5 × 1028 dyn cm). They noted, however, the presence of outliers in their dataset, notably strike–slip earthquakes on the Alaskan Fairweather Fault.

Also shown are the regular event nearby on 08 September 2002, and a small 2002 event near the coast of Hawaii interpreted by Reymond et al. (2004) as an underwater landslide. The background symbols in half-tone are the original dataset from Talandier and Okal (2001). D = 0 is shown as the dashed line. After Talandier and Okal (2004b). it is substantially deficient among Hawaiian earthquakes, and reminiscent of that of the 1998 PNG underwater landslide. , 2004). This tentative interpretation would support the contention that landslides are probably rather inefficient, if not occasionally silent, sources of hydroacoustic energy, even though their duration may be substantial.

438 km/s, indicates that its energy mostly reverberates at a steep incidence (25◦ ) between the surface and bottom of the ocean, and does not propagate laterally in the SOFAR channel. In this framework, modal theory cannot explain the excitation of an abyssal T phase in a flat-layered structure any better than its geometrical optics dual, namely ray theory. THE GENERATION OF T WAVES BY EARTHQUAKES F IG . 9. Theoretical modal solutions reproduced from Pekeris (1948) and Park et al. (2001). (a): Pekeris’ solution, obtained for his waveguide model shown on Fig.

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