Figure 1
Map of northern California showing faults (lines), the extent of the 1906 rupture of the San Andreas fault (thick line), and the 1906 epicenter (star) of Bolt (1968).  Inset map shows the location of the larger map.

Figure 2
Map showing the intensity distribution for the 18 Apr 1906, 14:28 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 5.

Figure 3
Map showing the intensity distribution for the 18 Apr 1906 triggered event in the Imperial Valley.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Three "F" observations have been omitted from the figure for the sake of map legibility, because those points are near other observations: Heber, Silsbee, and Ballast Point.  Thin lines are faults.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 6.

Figure 4
Map showing the intensity distribution for the 19 Apr 1906 triggered event near Santa Monica Bay.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 7.

Figure 5
Map showing the intensity distribution for the 19 Apr 1906 triggered event near Fernley, Nevada.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 8.

Figure 6
Map showing the intensity distribution for the 23 Apr 1906 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 9.

Figure 7
Map showing the intensity distribution for the 25 Apr 1906 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Two "F" observations have been omitted from the figure for the sake of map legibility, because those points are near other observations: Alameda pier and Mile Rocks.  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 10.

Figure 8
Map showing the intensity distribution for the 17 May 1906 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Six "F" observations have been omitted from the figure for the sake of map legibility, because those points are near other observations: Alameda pier, Point Bonita, Point Pios, Mile Rocks, Yerba Buena, and Campbell.  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 11.

Figure 9
Map showing the intensity distribution for the 6 Jul 1906 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 12.

Figure 10
Map showing the intensity distribution for the 5 Jun 1907 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Nine "F" observations have been omitted from the figure for the sake of map legibility, because those points are near other observations: Dimond, 
Mills College, Oakland, Half Moon Bay, Menlo Park, San Gregorio, Alma, Campbell, and Santa Clara.  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 13.

Figure 11
Map showing the intensity distribution for the 8 Aug 1907 aftershocks, which are assumed to be similar.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 14.

Figure 12
Map showing the intensity distribution for the 11 Aug 1907 aftershock.  Triangles designate locations for which there is intensity information; adjacent to each triangle is either a Roman numeral (indicating the Modified Mercalli intensity), or "F" or "NF" (indicating felt or not felt, respectively, at that location).  Two "F" observations have been omitted from the figure for the sake of map legibility, because those points are near other observations: Ryan Slough and Shady Creek gravel mine.  Thin lines are faults, and the thick line is the location of the 1906 rupture.  Inset map shows the location of the larger map.  A complete list of intensities for this event is given in Table 15.