Magnetic Anomalies off the Northwest Coast of the United States

Marine geology of the continental margin off southern Oregon

“…4 and 4. 5 km (Emilia, et al , 1968), which agrees with similar calculations made by Silver (1969a) (Emilia, ejt al . , 1968 Tobin and Sykes (1968) and Bolt, e_t al .…”

“…This anomaly may be due to the dip of the Moho beneath the continent and the overlying wedge of sediments at the base of the slope which appear to thicken northward of 42°00'N (Couch, 1970 Figure 12). Couch (1970) Emilia, et al ( 1968) and Silver ( 1969a, b). Silver ( 1969a) notes the presence of magnetic anomaly 3 (5 million years, Vine, 1966) Emilia, et al .…”

“…Couch (1970) Emilia, et al ( 1968) and Silver ( 1969a, b). Silver ( 1969a) notes the presence of magnetic anomaly 3 (5 million years, Vine, 1966) Emilia, et al . (1968), and anomaly 3 noted by…”

Site Survey of the Northern Oregon Continental Margin and Astoria Fan

“…Seismic reflection profiles across the northern Oregon continental shelf and slope show the shallow structure consists of relatively gentle folds and faults (Figure 10 reported by Emilia et al (1968) for this part of the shelf and the acoustic basement is probably a shelf extension of middle Miocene extrusive and intrusive basalt that crop out in the coastal region (Snavely and others, in press). A younger unconformity, which truncates folded structures, is present on the outer edge of the shelf and appears to be exposed on the westernmost limb of Nehalem Banks.…”

“…Seismic reflection profiles were made earlier in 1970 by the U. S. Geological Survey on the USNS Bartlett near Site 175 (Figure 2, G-F). Detailed gravity and magnetics studies on the Oregon margin are described by ,22= 42"- Dehlinger et al (1968) and Emilia et al (1968), respectively. The unconsolidated and consolidated sediments were sampled in previous studies of this area (Nelson, 1968;Kulm and Fowler, 1972).…”