Open-File Report 02-109
Bakun et al. (submitted) calculated site corrections for communities in ENA with MMI assignments for more than 1 recent earthquake with independent estimates of moment magnitude M (Hanks and Kanamori, 1979) and epicenter location. The site corrections can account for amplification due to local geologic conditions and also to regional variations in crustal properties. Following Bakun and Wentworth (1997), the site correction is the mean {observed MMI - calculated MMI} at the site. The calculation of the ENA site corrections is described in detail in Bakun et al.(submitted). The 1,535 site corrections are based on 9,574 MMI assignments, 5,811 of which were not used because they were the only MMI assignment available for that site.
The site corrections reflect the consistent spatial intensity anomalies of the past 75 or so years of earthquakes in ENA. However, the empirical site corrections for many communities are estimated from MMI for only a few events and are uncertain. The standard deviations, the numbers of earthquakes used to calculate that site correction, and the uncertainties of the site corrections are listed. Site corrections flagged by ** are most reliable; those flagged by * are somewhat reliable, and unflagged site corrections were obtained from inconsistent MMI residuals.
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