Figure 2. HAWAII MR1 bathymetric texture and acoustic imagery. Relocated epicenters (black circles) and earthquake focal mechanisms are from Abers et al. (1997). PP = Papuan Peninsula, G = Goodenough Island, F = Fergusson Island, N = Normanby Island, R = Rossel Island, T = Tagula Island, MS = Moresby Seamount, MT = Moresby Transform Fault, M = Misima Island, W = Woodlark Island. The solid line is the landward boundary of oceanic crust, and the dashed line marks the boundary of crust formed during the Brunhes Chron.
Figure 3. Location of the proposed drill sites (Sites ACE-1c, 3c, 7b, 8a, and 9a) and multichannel seismic track data plotted on a base map with 100-m bathymetric contours (thicker contours labeled every km). Relocated earthquake epicenters (open black circles) together with the focal mechanisms (beach balls) are from Abers et al. (1997). The western limit of the Woodlark spreading system is marked by the closed black line, the major rift-bounding normal faults by the ticked lines.
Figure 4. Migrated seismic profiles showing the location of the proposed drill sites, Sites ACE 1c, 3c, 7b, 8a, and 9a.
Figure 5.Nested meridional sections showing the regional and local structures across the incipient conjugate margins. The proposed drill sites are Sites ACE-3c, 8a, and 9a, with alternate Sites ACE-1c and 7b. VE = vertical exaggeration.
Figure 6. Planned reentry cone and casing installation at Site ACE-8a.
To 180 Table 1: Site Time Estimates
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