Post ShakeAlert Message Summaries provide information about earthquakes detected by the ShakeAlert Earthquake Early Warning System and ShakeAlert’s performance during these events. They summarize how accurately the ShakeAlert System estimated the earthquake’s location and magnitude, how many seismic stations contributed data to these estimates, and how much warning time nearby cities may have received. These summaries are automatically generated for all USGS-issued ShakeAlert Messages with an estimated peak magnitude (M) of 3.5 or larger. Only at M 4.0 or larger are ShakeAlert Messages human-reviewed and forwarded to the National Earthquake Information Center to be posted at www.earthquake.usgs.gov. Summaries for earthquakes less than M 4.0 provide our scientists with more frequent tests of software readiness, but their 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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2034_2022-07-25_11:21:07_44.9_mi_S_of_Tijuana_B.C._4.5.pdf
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July 25, 2022 | 235.95 KB | |
2033_2022-07-23_01:41:04_7.4_mi_SE_of_Oroville_4.2.pdf
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July 23, 2022 | 314.07 KB | |
2032_2022-07-18_17:07:58_26.6_mi_N_of_Tehachapi_3.4.pdf
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July 18, 2022 | 274.99 KB | |
2031_2022-07-17_18:18:39_26.3_mi_NW_of_Westmorland_3.4.pdf
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July 17, 2022 | 303.36 KB | |
2030_2022-07-17_15:44:26_26.7_mi_N_of_Tehachapi_3.7.pdf
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July 17, 2022 | 280.84 KB | |
2029_2022-07-17_11:34:47_26.3_mi_N_of_Tehachapi_3.4.pdf
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July 17, 2022 | 274.74 KB | |
2028_2022-07-17_08:19:59_10.6_mi_E_of_Cloverdale_3.5.pdf
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July 17, 2022 | 311.83 KB | |
2027_2022-07-15_01:19:06_7.8_mi_NE_of_Ridgecrest_4.3.pdf
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July 15, 2022 | 290.19 KB | |
2026_2022-07-06_06:15:46_29.4_mi_N_of_Tehachapi_3.5.pdf
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July 06, 2022 | 280.04 KB | |
2025_2022-07-02_15:57:24_36.0_mi_SW_of_Rio_Dell_2.7.pdf
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July 02, 2022 | 159.76 KB | |
2024_2022-06-29_04:19:36_6.4_mi_NW_of_Calipatria_3.0.pdf
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June 29, 2022 | 293.16 KB | |
2023_2022-06-28_11:57:40_11.0_mi_SW_of_Clearlake_3.8.pdf
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June 28, 2022 | 311.87 KB | |
2022_2022-06-24_09:05:12_7.2_mi_NW_of_Parkfield_3.5.pdf
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June 24, 2022 | 287.03 KB | |
2021_2022-06-20_03:40:29_20.6_mi_SE_of_Mexicali_B.C._3.7.pdf
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June 20, 2022 | 266.62 KB | |
2020_2022-06-13_09:40:43_8.3_mi_SW_of_Lakeport_3.3.pdf
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June 13, 2022 | 296.71 KB | |
2019_2022-06-12_22:44:40_24.0_mi_SE_of_Mexicali_B.C._3.1.pdf
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June 12, 2022 | 273.56 KB | |
2018_2022-06-09_22:26:59_25.9_mi_SW_of_Rio_Dell_3.8.pdf
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June 09, 2022 | 201.32 KB | |
2017_2022-06-08_22:48:21_26.5_mi_N_of_Tehachapi_3.5.pdf
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June 08, 2022 | 276.39 KB | |
2016_2022-06-03_10:40:29_25.8_mi_E_of_Escondido_3.6.pdf
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June 03, 2022 | 380.85 KB | |
2015_2022-06-02_12:07:21_7.1_mi_N_of_Pittsburg_4.1.pdf
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June 02, 2022 | 394.90 KB | |
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 |