Bulletin of the Seismological Society of America; February 2003; v. 93; no. 1;
p. 14-26; DOI: 10.1785/0120020013
© Seismological Society of America
Click on image to view larger version.
Figure 3. (A) Magnetic map of the Hayward Fault Zone and vicinity composed of two aeromagnetic surveys flown in a northeast direction, with a flight-line spacing of 500 m (
mile) and a nominal flight-line elevation of 250 m (820 ft) above water and 300 m (1000 ft) above land. Explanation as in Figure 2. (B) Magnetic map enhancing shallow magnetic sources of the Hayward Fault Zone and vicinity. Shallow magnetic sources were enhanced by upward continuing the magnetic data a small distance (250 m) and then subtracting this field from the unfiltered data set to derive a residual field. The resulting map highlights magnetic sources within about 2.5 km of the surface. Explanation as in Figure 2. Expanded view of rectangular area is shown in Figure 4.
