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73 <br /> <br /> <br />Ground shaking is commonly characterized using the Modified Mercalli Intensity <br />(MMI) scale, which illustrates the intensity of ground shaking at a particular location <br />by considering the effects on people, objects, and buildings. The MMI scale describes <br />shaking intensity on a scale of 1-12. MMI values less than 5 don’t typically cause <br />significant damage; MMI values greater than 10 have not been recorded. <br /> <br />As described, there are a number of different faults that contribute to the seismic <br />hazard in the Bay Area. ABAG and the United States Geological Survey (USGS) worked <br />collaboratively to characterize which fault contributes most to an area’s seismic <br />hazard. Figure 5-6 maps which fault contributes most to an areas seismic risk, taking <br />into account the locations proximity to various faults, and the likelihood and severity <br />of each fault. The map characterizes the fault with the greatest hazard, but many <br />locations in the region can be severely impacted by multiple faults. <br /> <br />Figure 5-5 MMI Intensity <br /> <br /> <br />112