Figure 4A. Hypocenter locations from the 6-week 1978 onshore-offshore (ocean-bottom) experiment of Frohlich et al. (1982). The ocean-bottom experiment demonstrated that the locations of the Adak network were essentially correct. Inset shows stations of the Adak network used in the test (half filled triangles) and locations of the ocean-bottom seismometers (open triangles). Adapted from Frohlich et al. (1982), their figures 1 and 5A which were copyrighted by AGU, 1982.

Figure 4B. Overlay of Figure 4A onto Figure 13 of Murdock (1969). The latter was used by me, together with the Pn data, to estimate the position of the RTB-thrust, Figure 2 of this paper. Solid dots (or red, if color display), Murdock, 1969, half filled ones, Frohlich, 1982, Figure 4A this paper. See caption of Figure 4A for copyright information.

Comments and questions should be directed to James N. Murdock, 611 Green Valley Dr. SE, Albuquerque, NM 87123, USA, (phone: 505.299.5254).