Figure F88. Location of the WP-1 seafloor borehole seismic observatory in relation to global seismicity. M = magnitude of earthquakes. A total of 1334 earthquakes that occurred from 1992 to 1996 with a magnitude of >5.5 are plotted. Hypocenters are located by the International Seismological Centre (ISC). Concentric circles indicate epicentral distances of 45°, 90°, and 135° from the WP-1 observatory. Because earthquakes with magnitudes >5.5 can be generally observed by many seismic stations in the world, >1000 earthquakes are expected to be observed by the WP-1 seafloor borehole seismic station in a 5-yr period.

Figure F88. Location of the WP-1 seafloor borehole seismic observatory in relation to global seismicity. M = magnitude of earthquakes. A total of 1334 earthquakes that occurred from 1992 to 1996 with a magnitude of >5.5 are plotted. Hypocenters are located by the International Seismological Centre (ISC). Concentric circles indicate epicentral distances of 45°, 90°, and 135° from the WP-1 observatory. Because earthquakes with magnitudes >5.5 can be generally observed by many seismic stations in the world, >1000 earthquakes are expected to be observed by the WP-1 seafloor borehole seismic station in a 5-yr period.