Post ShakeAlert Message Summaries provide information about earthquakes detected by the USGS component of ShakeAlert Earthquake Early Warning System (see graphic below). They summarize how accurately the ShakeAlert system estimated an earthquake’s location, magnitude, shaking intensities, how much warning time for selected nearby cities, and how many seismic stations contributed data to these estimates. Estimated warning times on the summaries does not include the additional time it takes for ShakeAlert Licensed Operators to deliver alerts to end-users (e.g. alert delivery to cell phones). Summaries are automatically generated for earthquakes with an estimated peak magnitude (M) of 3.5 or larger. For earthquakes estimated at M4.0 or larger, ShakeAlert Messages are human-reviewed and forwarded to the USGS Earthquake Hazards Program to be posted at www.earthquake.usgs.gov. ShakeAlert produces summaries for earthquakes less than M4.0 to test software readiness, but the results are generally not reviewed for quality or accuracy.

Please Note: USGS does not warrant that this information resource will be available without interruption, be error-free, or that any errors must be corrected. Post ShakeAlert Message Summaries are provided “AS IS” and without any warranty, express, implied, or otherwise, regarding its accuracy or performance. Any reliance upon this resource is at the express and sole risk of the user, including its employees, assigns, and insurers.
File | Date Posted | Size | |
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2014_2022-05-31_19:00:01_11.5_mi_E_of_Cloverdale_3.2.pdf
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May 31, 2022 | 310.48 KB | |
2013_2022-05-30_09:50:56_46.0_mi_W_of_Fortuna_3.5.pdf
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May 30, 2022 | 123.67 KB | |
2012_2022-05-29_15:26:56_65.4_mi_SE_of_Tijuana_B.C._3.7.pdf
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May 29, 2022 | 203.81 KB | |
2011_2022-05-26_09:23:32_14.9_mi_E_of_Ridgecrest_4.3.pdf
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May 26, 2022 | 278.43 KB | |
2010_2022-05-16_06:16:50_4.6_mi_NE_of_Desert_Hot_Springs_3.7.pdf
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May 16, 2022 | 317.64 KB | |
2009_2022-05-14_21:28:14_9.8_mi_S_of_Maricopa_3.2.pdf
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May 14, 2022 | 318.50 KB | |
2008_2022-05-13_13:32:36_19.7_mi_SE_of_Temecula_3.7.pdf
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May 13, 2022 | 386.10 KB | |
2007_2022-05-09_21:35:33_38.4_mi_E_of_Santee_3.6.pdf
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May 09, 2022 | 335.11 KB | |
2006_2022-05-01_03:17:37_11.0_mi_E_of_Cloverdale_3.4.pdf
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May 01, 2022 | 311.40 KB | |
2005_2022-04-30_18:17:56_11.7_mi_E_of_Cloverdale_3.5.pdf
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April 30, 2022 | 311.65 KB | |
2004_2022-04-22_05:02:34_13.2_mi_SE_of_Hollister_3.5.pdf
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April 22, 2022 | 331.68 KB | |
2003_2022-04-21_18:58:50_5.0_mi_NE_of_Imperial_3.6.pdf
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April 21, 2022 | 279.24 KB | |
2002_2022-04-20_05:19:44_4.2_mi_S_of_Brawley_3.5.pdf
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April 20, 2022 | 280.64 KB | |
2001_2022-04-20_03:56:46_4.0_mi_S_of_Brawley_3.2.pdf
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April 20, 2022 | 279.63 KB | |
2000_2022-04-19_20:30:08_4.5_mi_S_of_Brawley_3.9.pdf
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April 19, 2022 | 283.09 KB | |
1999_2022-04-19_20:22:41_3.9_mi_S_of_Brawley_3.6.pdf
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April 19, 2022 | 279.44 KB | |
1998_2022-04-19_05:00:09_1.9_mi_SE_of_Cloverdale_3.3.pdf
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April 19, 2022 | 301.06 KB | |
1997_2022-04-19_00:27:35_23.1_mi_SE_of_Mexicali_B.C._2.9.pdf
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April 19, 2022 | 259.59 KB | |
1996_2022-04-18_22:35:34_21.0_mi_SE_of_Mexicali_B.C._3.5.pdf
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April 18, 2022 | 269.45 KB | |
1995_2022-04-18_22:22:13_19.9_mi_SE_of_Mexicali_B.C._3.0.pdf
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April 18, 2022 | 266.28 KB | |
1994_2022-04-18_02:08:59_10.7_mi_E_of_Cloverdale_3.0.pdf
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April 18, 2022 | 311.35 KB | |
1993_2022-04-17_05:38:26_72.8_mi_SW_of_Mexicali_B.C._3.6.pdf
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April 17, 2022 | 178.19 KB | |
1992_post_event_summary.pdf
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April 15, 2022 | 196.13 KB | |
1991_2022-04-15_04:30:55_43.1_mi_S_of_Tijuana_B.C._4.7.pdf
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April 15, 2022 | 245.53 KB | |
1990_2022-04-11_23:40:20_8.2_mi_NW_of_Calipatria_3.2.pdf
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April 11, 2022 | 300.74 KB | |
1989_2022-04-04_15:18:31_5.3_mi_W_of_Rio_Dell_3.9.pdf
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April 04, 2022 | 251.23 KB | |
1988_2022-04-04_15:16:46_5.1_mi_W_of_Rio_Dell_4.0.pdf
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April 04, 2022 | 250.55 KB | |
1987_2022-04-03_09:51:30_10.0_mi_N_of_Barstow_3.7.pdf
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April 03, 2022 | 249.35 KB | |
1986_2022-04-02_10:31:04_26.7_mi_NE_of_Blue_Lake_3.8.pdf
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April 02, 2022 | 295.81 KB | |
1985_2022-03-31_02:05:26_12.0_mi_W_of_Bishop_4.3.pdf
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March 31, 2022 | 319.00 KB | |
1984_2022-03-25_21:10:59_6.4_mi_SW_of_Williams_3.8.pdf
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March 25, 2022 | 290.76 KB | |
1983_2022-03-22_10:33:38_4.2_mi_SE_of_Rancho_Cucamonga_3.4.pdf
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March 22, 2022 | 398.19 KB | |
1982_2022-03-19_16:59:41_6.4_mi_N_of_Watsonville_3.9.pdf
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March 19, 2022 | 347.63 KB | |
1981_2022-03-18_04:51:22_37.4_mi_SE_of_South_Lake_Tahoe_4.1.pdf
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March 18, 2022 | 326.05 KB | |
1980_2022-03-13_20:51:30_15.2_mi_E_of_Gonzales_4.1.pdf
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March 13, 2022 | 319.86 KB | |
1979_2022-03-07_16:22:42_40.9_mi_N_of_Mammoth_Lakes_3.6.pdf
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March 07, 2022 | 324.55 KB | |
1978_2022-03-05_15:07:29_16.2_mi_NE_of_Greenfield_3.4.pdf
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March 05, 2022 | 312.41 KB | |
1977_2022-03-03_11:39:58_13.0_mi_NE_of_Healdsburg_3.5.pdf
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March 03, 2022 | 316.04 KB | |
1976_2022-03-01_05:01:10_3.0_mi_W_of_Ojai_2.9.pdf
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March 01, 2022 | 308.28 KB | |
1975_2022-02-28_11:57:25_23.4_mi_S_of_Mexicali_B.C._3.3.pdf
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February 28, 2022 | 250.74 KB | |
1974_2022-02-27_01:44:18_5.8_mi_NW_of_Santa_Paula_3.9.pdf
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February 27, 2022 | 294.87 KB | |
1972_2022-02-19_21:35:37_21.8_mi_SW_of_Rio_Dell_3.1.pdf
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February 22, 2022 | 209.66 KB | |
1973_post_event_summary.pdf
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February 21, 2022 | 337.00 KB | |
1970_2022-02-12_00:26:19_69.3_mi_W_of_Fortuna_3.9.pdf
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February 18, 2022 | 103.03 KB | |
1971_post_event_summary.pdf
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February 18, 2022 | 167.44 KB | |
1969_post_event_summary.pdf
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February 08, 2022 | 308.69 KB | |
1968_post_event_summary.pdf
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February 06, 2022 | 395.98 KB | |
1967_post_event_summary.pdf
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February 06, 2022 | 311.07 KB | |
1966_post_event_summary.pdf
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February 04, 2022 | 300.17 KB |