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Figure 1. 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 shaded circle (at HCH) = a presently inactive land seismic station. Note that the few borehole stations effectively complement and expand the existing network. YSS = Yuzhno Sakhalinsk, Russia; NMR = Nemuro, Japan; HCH = Hachijo-shima, Japan; PHN = Pohang, Korea; OGS = Chichi-jima, Japan; MCSJ = Minami-tori-shima, Japan; ISG = Ishigaki, Japan; TGY = Tagaytay, Philippines; PATS = Ponsei, Mictonesia; and PMG = Port Moresby, Papua New Guinea.

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