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The Geysers is an active geothermal area within the Clear Lake volcanic field in Northern California. The earthquake activity in the Geysers area is quite variable over time, in terms of the number of events and their magnitude range.
This excerpt is taken from the Berkeley Seismological Laboratory 1992 Bulletin:
There were no earthquakes (ML >= 2.5) observed in the area of the geothermal field between 1949 and 1975. Starting in 1976 earthquakes were observed in the geothermal field and the rate steadily increased to a rate of at least 12 earthquake (ML >= 2.5) per year since 1984. The maximum annual rate was 26 earthquakes (ML >= 2.5) which occurred in 1988 (this is equivalent to 40 percent of the annual rate for the entire central coast ranges).
The late-Pliocene to early Holocene Clear Lake volcanic field in the northern Coast Ranges, contains lava dome complexes, cinder cones, and maars of basaltic-to-rhyolitic composition. The westernmost site of Quaternary volcanism in California, the Clear Lake field is located far to the west of the Cascade Range in a complex geologic setting within the San Andreas transform fault system. Mount Konocti, a composite dacitic lava dome on the south shore of Clear Lake, is the largest volcanic feature. Volcanism has been largely non-explosive, with only one major airfall tuff and no ash flows. The latest eruptive activity, forming maars and cinder cones along the shores of Clear Lake, continued until about 10,000 years ago. A large silicic magma chamber provides the heat source for the Geysers, the world's largest producing geothermal field.
MAP 1.0 2009/01/11 11:41:01 38.850 -122.764 1.7 4 km ( 2 mi) WNW of Cobb, CA
MAP 2.1 2009/01/11 10:20:23 39.041 -123.339 0.3 16 km ( 10 mi) SW of Ukiah, CA
MAP 1.4 2009/01/11 09:14:56 38.818 -122.819 3.0 2 km ( 2 mi) NNW of The Geysers, CA
MAP 1.9 2009/01/11 07:48:29 38.815 -122.783 1.9 3 km ( 2 mi) NE of The Geysers, CA
MAP 1.0 2009/01/11 07:43:59 38.847 -122.820 0.2 6 km ( 3 mi) NNW of The Geysers, CA
MAP 2.3 2009/01/11 07:25:39 38.822 -122.795 2.2 3 km ( 2 mi) NNE of The Geysers, CA
MAP 1.0 2009/01/11 07:23:34 38.829 -122.808 3.0 3 km ( 2 mi) N of The Geysers, CA
MAP 2.1 2009/01/11 06:58:05 38.813 -122.785 2.0 3 km ( 2 mi) NE of The Geysers, CA
MAP 1.3 2009/01/11 06:51:24 38.815 -122.803 1.7 2 km ( 1 mi) N of The Geysers, CA
MAP 1.3 2009/01/11 06:14:01 38.832 -122.830 1.4 4 km ( 3 mi) NNW of The Geysers, CA
MAP 1.8 2009/01/11 06:12:47 38.842 -122.832 1.1 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.9 2009/01/11 06:12:10 38.831 -122.829 2.0 4 km ( 3 mi) NNW of The Geysers, CA
MAP 2.2 2009/01/11 04:58:05 38.773 -122.743 2.6 4 km ( 3 mi) W of Anderson Springs, CA
MAP 1.8 2009/01/11 00:46:07 38.409 -122.659 9.3 6 km ( 4 mi) SE of Santa Rosa, CA
MAP 1.6 2009/01/10 22:56:02 38.840 -122.829 2.0 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.5 2009/01/10 19:11:40 38.841 -122.893 5.4 9 km ( 5 mi) WNW of The Geysers, CA
MAP 1.0 2009/01/10 18:19:44 38.836 -122.824 0.6 4 km ( 3 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/10 18:17:25 38.841 -122.828 1.1 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/10 18:14:55 38.838 -122.830 1.7 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.3 2009/01/10 18:14:10 38.837 -122.830 1.8 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.6 2009/01/10 18:12:52 38.834 -122.829 1.9 4 km ( 3 mi) NNW of The Geysers, CA
MAP 1.2 2009/01/10 18:10:58 38.837 -122.830 1.1 5 km ( 3 mi) NNW of The Geysers, CA
MAP 2.1 2009/01/10 18:07:04 38.836 -122.829 1.9 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.7 2009/01/10 17:43:47 39.442 -123.327 2.5 5 km ( 3 mi) NNE of Willits, CA
MAP 1.0 2009/01/10 16:57:53 38.843 -122.833 2.0 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.6 2009/01/10 16:38:00 38.821 -122.784 2.3 3 km ( 2 mi) NE of The Geysers, CA
MAP 1.6 2009/01/10 14:48:32 38.794 -122.767 3.1 3 km ( 2 mi) E of The Geysers, CA
MAP 1.4 2009/01/10 13:31:30 38.812 -122.814 3.0 2 km ( 1 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/10 13:09:38 38.849 -122.829 0.9 6 km ( 4 mi) NNW of The Geysers, CA
MAP 1.5 2009/01/10 09:53:44 38.806 -122.808 2.0 1 km ( 1 mi) N of The Geysers, CA
MAP 3.6 2009/01/10 09:18:11 39.032 -123.343 4.9 17 km ( 11 mi) SW of Ukiah, CA
MAP 2.2 2009/01/10 06:13:52 38.810 -122.819 2.6 2 km ( 1 mi) NW of The Geysers, CA
MAP 1.8 2009/01/09 22:20:33 38.839 -122.827 2.0 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.9 2009/01/09 21:06:20 38.772 -123.002 2.6 3 km ( 2 mi) SSE of Cloverdale, CA
MAP 2.2 2009/01/09 18:19:08 38.825 -122.791 1.1 3 km ( 2 mi) NNE of The Geysers, CA
MAP 1.4 2009/01/09 15:32:22 38.830 -122.828 3.6 4 km ( 2 mi) NNW of The Geysers, CA
MAP 2.1 2009/01/09 12:49:17 38.837 -122.825 2.9 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.8 2009/01/09 07:00:13 38.825 -122.754 0.6 3 km ( 2 mi) WSW of Cobb, CA
MAP 1.0 2009/01/09 05:31:38 38.846 -122.834 1.1 6 km ( 4 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/09 03:41:38 38.818 -122.791 1.9 3 km ( 2 mi) NNE of The Geysers, CA
MAP 1.0 2009/01/09 00:48:12 38.841 -122.828 1.6 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.2 2009/01/08 22:49:11 38.786 -122.737 2.1 4 km ( 3 mi) WNW of Anderson Springs, CA
MAP 1.0 2009/01/08 22:26:50 38.808 -122.809 2.0 1 km ( 1 mi) N of The Geysers, CA
MAP 1.0 2009/01/08 19:39:18 38.843 -122.829 1.9 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.3 2009/01/08 15:16:13 38.836 -122.832 2.4 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.3 2009/01/08 13:27:01 38.786 -122.737 2.3 4 km ( 3 mi) WNW of Anderson Springs, CA
MAP 1.4 2009/01/08 06:43:00 38.834 -122.802 2.3 4 km ( 2 mi) N of The Geysers, CA
MAP 1.8 2009/01/08 06:23:37 38.775 -122.730 1.5 3 km ( 2 mi) W of Anderson Springs, CA
MAP 1.2 2009/01/08 05:49:34 38.836 -122.796 2.6 4 km ( 3 mi) NNE of The Geysers, CA
MAP 1.4 2009/01/08 04:05:01 38.832 -122.811 2.5 4 km ( 2 mi) N of The Geysers, CA
MAP 1.6 2009/01/08 03:42:44 38.832 -122.809 2.5 4 km ( 2 mi) N of The Geysers, CA
MAP 1.2 2009/01/08 03:41:51 38.790 -122.759 2.3 4 km ( 3 mi) ESE of The Geysers, CA
MAP 1.5 2009/01/08 01:14:14 38.793 -122.808 3.7 1 km ( 0 mi) S of The Geysers, CA
MAP 1.2 2009/01/08 00:49:59 38.844 -122.824 2.2 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/07 23:31:39 38.842 -122.828 1.7 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/07 22:07:10 38.843 -122.826 1.9 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.6 2009/01/07 21:17:55 38.837 -122.825 2.4 5 km ( 3 mi) NNW of The Geysers, CA
MAP 2.3 2009/01/07 20:31:41 38.842 -122.824 2.2 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.1 2009/01/07 18:06:05 38.814 -122.819 2.7 2 km ( 1 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/07 17:16:41 38.824 -122.806 0.7 3 km ( 2 mi) N of The Geysers, CA
MAP 1.0 2009/01/07 16:33:18 38.840 -122.808 2.5 5 km ( 3 mi) N of The Geysers, CA
MAP 1.6 2009/01/07 09:50:09 38.754 -122.718 2.0 3 km ( 2 mi) SW of Anderson Springs, CA
MAP 1.9 2009/01/07 09:04:32 38.811 -122.813 2.8 2 km ( 1 mi) NNW of The Geysers, CA
MAP 1.9 2009/01/07 07:32:10 38.830 -122.761 0.7 3 km ( 2 mi) W of Cobb, CA
MAP 1.5 2009/01/07 01:49:59 38.520 -122.642 5.9 9 km ( 5 mi) SW of Calistoga, CA
MAP 2.2 2009/01/06 21:31:39 39.263 -122.748 9.2 18 km ( 11 mi) NNE of Nice, CA
MAP 1.2 2009/01/06 21:30:13 38.826 -122.801 2.3 3 km ( 2 mi) N of The Geysers, CA
MAP 1.4 2009/01/06 21:13:54 38.831 -122.796 2.2 4 km ( 2 mi) NNE of The Geysers, CA
MAP 1.1 2009/01/06 21:04:31 38.828 -122.799 0.9 3 km ( 2 mi) N of The Geysers, CA
MAP 1.8 2009/01/06 21:03:54 38.831 -122.787 0.6 4 km ( 2 mi) NNE of The Geysers, CA
MAP 1.0 2009/01/06 21:03:34 38.831 -122.797 1.9 4 km ( 2 mi) NNE of The Geysers, CA
MAP 1.7 2009/01/06 21:03:19 38.826 -122.796 1.4 3 km ( 2 mi) NNE of The Geysers, CA
MAP 2.9 2009/01/06 21:02:22 38.826 -122.797 0.6 3 km ( 2 mi) NNE of The Geysers, CA
MAP 1.3 2009/01/06 20:57:31 38.813 -122.794 3.7 2 km ( 1 mi) NE of The Geysers, CA
MAP 1.2 2009/01/06 20:06:41 38.829 -122.804 2.1 3 km ( 2 mi) N of The Geysers, CA
MAP 1.4 2009/01/06 16:12:19 38.821 -122.829 1.7 3 km ( 2 mi) NW of The Geysers, CA
MAP 1.7 2009/01/06 09:40:45 38.778 -122.721 0.8 3 km ( 2 mi) W of Anderson Springs, CA
MAP 1.8 2009/01/06 09:09:34 38.785 -122.743 1.5 5 km ( 3 mi) WNW of Anderson Springs, CA
MAP 2.7 2009/01/06 08:38:22 38.915 -123.041 0.3 13 km ( 8 mi) N of Cloverdale, CA
MAP 1.4 2009/01/06 03:40:51 38.842 -122.826 2.0 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.7 2009/01/06 00:07:02 38.813 -122.818 2.5 2 km ( 1 mi) NNW of The Geysers, CA
MAP 1.0 2009/01/05 23:17:00 38.835 -122.801 2.4 4 km ( 3 mi) N of The Geysers, CA
MAP 1.5 2009/01/05 22:32:24 38.818 -122.822 2.7 3 km ( 2 mi) NNW of The Geysers, CA
MAP 1.4 2009/01/05 18:19:16 38.836 -122.829 2.1 5 km ( 3 mi) NNW of The Geysers, CA
MAP 1.4 2009/01/05 18:11:21 38.830 -122.809 2.9 4 km ( 2 mi) N of The Geysers, CA
MAP 1.1 2009/01/05 16:45:35 38.813 -122.791 3.5 2 km ( 1 mi) NE of The Geysers, CA
MAP 1.1 2009/01/05 15:19:42 38.809 -122.739 2.2 3 km ( 2 mi) SSW of Cobb, CA
MAP 1.1 2009/01/05 10:59:55 38.824 -122.829 2.9 3 km ( 2 mi) NW of The Geysers, CA
MAP 1.0 2009/01/05 08:41:25 38.821 -122.750 0.0 3 km ( 2 mi) SW of Cobb, CA
MAP 1.2 2009/01/05 06:35:19 38.825 -122.801 3.7 3 km ( 2 mi) N of The Geysers, CA
MAP 1.4 2009/01/05 04:56:12 38.828 -122.805 1.7 3 km ( 2 mi) N of The Geysers, CA
MAP 2.6 2009/01/05 04:20:47 38.821 -122.801 3.1 3 km ( 2 mi) N of The Geysers, CA
MAP 1.6 2009/01/05 01:50:47 38.796 -122.775 0.6 3 km ( 2 mi) E of The Geysers, CA
MAP 1.2 2009/01/05 01:42:01 38.845 -122.829 1.8 6 km ( 3 mi) NNW of The Geysers, CA
MAP 1.9 2009/01/05 01:05:33 38.804 -122.790 2.1 2 km ( 1 mi) ENE of The Geysers, CA
MAP 1.1 2009/01/04 20:09:57 38.819 -122.824 1.3 3 km ( 2 mi) NNW of The Geysers, CA
MAP 1.6 2009/01/04 19:23:28 38.773 -122.751 1.4 5 km ( 3 mi) W of Anderson Springs, CA
MAP 1.2 2009/01/04 18:41:17 38.804 -122.751 0.7 4 km ( 3 mi) SW of Cobb, CA
MAP 1.2 2009/01/04 18:28:06 38.785 -122.773 3.5 3 km ( 2 mi) ESE of The Geysers, CA
MAP 1.9 2009/01/04 17:59:39 38.792 -122.771 3.9 3 km ( 2 mi) ESE of The Geysers, CA
MAP 1.0 2009/01/04 17:47:56 38.794 -122.761 1.2 4 km ( 2 mi) E of The Geysers, CA
MAP 1.2 2009/01/04 17:37:23 38.790 -122.780 0.3 3 km ( 2 mi) ESE of The Geysers, CA
MAP 1.1 2009/01/04 17:36:35 38.803 -122.749 1.0 4 km ( 3 mi) SSW of Cobb, CA
MAP 1.5 2009/01/04 17:34:12 38.815 -122.823 1.9 2 km ( 1 mi) NW of The Geysers, CA
MAP 2.0 2009/01/04 17:32:06 38.798 -122.773 0.4 3 km ( 2 mi) E of The Geysers, CA
MAP 4.2 2009/01/04 17:27:10 38.783 -122.772 4.3 3 km ( 2 mi) ESE of The Geysers, CA
MAP 2.1 2009/01/04 17:06:21 38.814 -122.794 1.9 2 km ( 1 mi) NNE of The Geysers, CA
MAP 1.0 2009/01/04 15:56:40 38.816 -122.798 3.0 2 km ( 1 mi) NNE of The Geysers, CA
MAP 1.9 2009/01/04 15:42:09 38.818 -122.793 3.5 3 km ( 2 mi) NNE of The Geysers, CA
MAP 2.0 2009/01/04 15:28:27 38.815 -122.796 2.3 2 km ( 1 mi) NNE of The Geysers, CA