List of 2013 shakes caused NOT by and earthquake (notice the depth). Maybe it can be usefull to research OPs reports.

Date Time Lat Lon Depth Mag Magt Nst Gap Clo RMS SRC Event ID
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2013/01/03 19:42:51.16 39.6255 -121.5383 0.01 1.51 Md 9 190 7 0.09 NC 71914631
2013/01/04 21:38:58.22 37.3227 -122.1037 0.01 1.26 Md 11 99 2 0.06 NC 71915231
2013/01/09 19:31:07.62 40.7513 -122.3138 0.01 1.68 Md 11 74 21 0.06 NC 71918291
2013/01/09 22:18:24.25 37.3270 -122.1063 0.01 1.48 Md 23 53 1 0.12 NC 71918416
2013/01/11 21:33:27.58 36.8863 -121.6098 0.01 1.39 Md 12 83 4 0.17 NC 71920116
2013/01/14 15:56:15.84 38.0688 -120.4005 0.01 1.21 Md 6 208 4 0.05 NC 71921511
2013/01/14 22:19:27.73 37.3585 -122.1015 0.01 1.36 Md 6 175 3 0.07 NC 71921706
2013/01/16 20:59:18.06 35.4328 -120.5742 0.01 1.69 Md 44 55 4 0.10 NC 71922956
2013/01/17 18:17:41.99 38.0738 -120.3905 0.01 1.90 Unk 4 223 4 0.00 NC 71923596
2013/01/17 20:15:44.18 36.7568 -121.5983 0.01 1.29 Md 23 107 3 0.14 NC 71923646
2013/01/18 19:58:34.43 39.6055 -121.5680 0.01 2.44 Md 14 131 7 0.12 NC 71924221