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Modified Mercalli Intensity (MM/) data are used by Bakun (in preparation) to estimate the location and moment magnitude M of California north-coast earthquakes from MMI observations only. The MMI data and site corrections used by Bakun (in preparation) are listed in this Open-file Report. This report is also accessible at h ttp://quake, wr. usgs. gov/~bakun/. Explanation of Table 1 Intensity observations have been obtained from several sources that assign intensity values according to descriptions in the Modified Mercalli Intensity (MM/) scale proposed by Wood and Neumann (1931): Toppozada et al. (1981) for earthquakes before 1900, Toppozada et al (1982) for the 29 October 1909 and 22 January 1923 earthquakes, Townley and Alien (1939) for the 31 January 1922 shock, United States Earthquakes for earthquakes in the interval 1931-1986 [Neumann (1934, 1936, 1938, 1943), Bodle and Murphy (1947), Murphy and Cloud (1953, 1956), Brazee and Cloud (1958), Talley and Cloud (1962), Lander and Cloud (1964), Stover and von Hake (1982), and Stover and Brewer (1994)], and Dreger et al. (1995) for the 17 August 1991 earthquake. Unpublished intensity data of the U S Geological Survey (J. W. Dewey, written communication, 1997) were used for the 31 July 1987, 25 April 1992, and 1 September

Modified Mercalli intensities for some California north-coast earthquakes