Figure F1. Location map of seismic station coverage in the northwest Pacific. Solid circles indicate land stations; open circles indicate ODP borehole seismometer site locations, current and future. Note that the ocean observatories complement the land stations, making a more regular net. 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; and PMG = Port Moresby, Papua New Guinea.