This electronic supplement contains “Did You Feel It?” (DYFI) maps for moderate (M 3.5–6.0) earthquakes in northern California.
The links to the DYFI maps for these 15 earthquakes have been incorporated to allow readers to review them easily and to evaluate for themselves the fragmentation of the felt areas that this article seeks to address. The brief comments highlight aspects of these DYFI maps that are similar to or different from the maps of the two earthquakes that are analyzed in the main article.
28 August 2016 M 4.5 Hayfork Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72686711#dyfi (last accessed May 2016). Similar to the 2012 Weitchpec earthquake.
10 August 2016 M 5.1 Upper Lake Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72672610#dyfi (last accessed May 2016). Fragmented in the northern Bay area and the Great Valley.
4 August 2016 M 4.5 Janesville Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72670060#dyfi (last accessed May 2016). Felt area badly fragmented in all directions.
19 July 2016 M 4.2 Ridgemark Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72663506#dyfi (last accessed May 2016). Weaker shaking to the northwest than in the 2012 San Juan Bautista earthquake.
16 February 2016 M 4.8 Big Pine Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72592670#dyfi (last accessed May 2016). Felt over a large but fragmented area.
17 August 2015 M 4.0 Piedmont Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72507396#dyfi (last accessed May 2016). Generally compact felt area that coincides with urbanized Bay area.
22 May 2015 M 4.1 Yountville Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72453246#dyfi (last accessed May 2016). Fragmented in the southern Bay area.
20 January 2015 M 4.4 Greenfield Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72383481#dyfi (last accessed May 2016). Many disjoint ZIP codes in the southeastern Great Valley.
4 October 2014 M 3.9 Willits Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72320511#dyfi (last accessed May 2016). Compact felt area with two distant outliers.
24 August 2014 M 6.0 South Napa Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72282711#dyfi (last accessed May 2016). Very fragmented felt area, particularly to the east.
28 September 2014 M 4.4 South Dos Palos Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72316031#dyfi (last accessed May 2016). Very fragmented felt area.
23 May 2013 M 5.7 Canyondam Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc71996906#dyfi (last accessed May 2016). Relatively compact felt area with outliers to the west and south.
9 May 2013 M 3.5 Alum Rock Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc71988946#dyfi (last accessed May 2016). Apparently compact felt area with many underreporting ZIP codes.
12 December 2013 M 4.1 Lost Hills Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72119970#dyfi (last accessed May 2016). Fragmented felt area that is strongly asymmetric to the northeast.
21 October 2012 M 5.3 New Idria Earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/ci15233041#dyfi (last accessed May 2016). Relatively compact felt area with many disjoint ZIP codes to the north.
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