Figure F1. Location map of seismic station coverage in the northwest Pacific. Solid circles = land seismic stations, open circles = current (Sites 1150, 1151, and 1179) and proposed (Site WP-1) seafloor borehole observatories, and the shaded circle = a presently inactive land seismic station (at HCH). Note that the few borehole stations effectively complement and expand the existing network. YSS = Yuzhno Sakhalinsk, Russia; NMR = Nemuro, Japan; HCH = Hachijojima, Japan; PHN = Pohang, Korea; OGS = Chichijima, Japan; MCSJ = Minami-torishima, Japan; ISG = Ishigakijima, Japan; TGY = Tagaytay, Philippines; PATS = Ponphei, Micronesia; PMG = Port Moresby, Papua New Guinea.