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Post ShakeAlert Message Summaries


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.

FileDate PostedSize
2036_2022-07-28_20:49:30_44.6_mi_W_of_Fortuna_2.5.pdf
July 30, 2022 120.69 KB
2035_post_event_summary.pdf
July 28, 2022 209.92 KB
2034_2022-07-25_11:21:07_44.9_mi_S_of_Tijuana_B.C._4.5.pdf
July 25, 2022 235.95 KB
2033_2022-07-23_01:41:04_7.4_mi_SE_of_Oroville_4.2.pdf
July 23, 2022 314.07 KB
2032_2022-07-18_17:07:58_26.6_mi_N_of_Tehachapi_3.4.pdf
July 18, 2022 274.99 KB
2031_2022-07-17_18:18:39_26.3_mi_NW_of_Westmorland_3.4.pdf
July 17, 2022 303.36 KB
2030_2022-07-17_15:44:26_26.7_mi_N_of_Tehachapi_3.7.pdf
July 17, 2022 280.84 KB
2029_2022-07-17_11:34:47_26.3_mi_N_of_Tehachapi_3.4.pdf
July 17, 2022 274.74 KB
2028_2022-07-17_08:19:59_10.6_mi_E_of_Cloverdale_3.5.pdf
July 17, 2022 311.83 KB
2027_2022-07-15_01:19:06_7.8_mi_NE_of_Ridgecrest_4.3.pdf
July 15, 2022 290.19 KB
2026_2022-07-06_06:15:46_29.4_mi_N_of_Tehachapi_3.5.pdf
July 06, 2022 280.04 KB
2025_2022-07-02_15:57:24_36.0_mi_SW_of_Rio_Dell_2.7.pdf
July 02, 2022 159.76 KB
2024_2022-06-29_04:19:36_6.4_mi_NW_of_Calipatria_3.0.pdf
June 29, 2022 293.16 KB
2023_2022-06-28_11:57:40_11.0_mi_SW_of_Clearlake_3.8.pdf
June 28, 2022 311.87 KB
2022_2022-06-24_09:05:12_7.2_mi_NW_of_Parkfield_3.5.pdf
June 24, 2022 287.03 KB
2021_2022-06-20_03:40:29_20.6_mi_SE_of_Mexicali_B.C._3.7.pdf
June 20, 2022 266.62 KB
2020_2022-06-13_09:40:43_8.3_mi_SW_of_Lakeport_3.3.pdf
June 13, 2022 296.71 KB
2019_2022-06-12_22:44:40_24.0_mi_SE_of_Mexicali_B.C._3.1.pdf
June 12, 2022 273.56 KB
2018_2022-06-09_22:26:59_25.9_mi_SW_of_Rio_Dell_3.8.pdf
June 09, 2022 201.32 KB
2017_2022-06-08_22:48:21_26.5_mi_N_of_Tehachapi_3.5.pdf
June 08, 2022 276.39 KB
2016_2022-06-03_10:40:29_25.8_mi_E_of_Escondido_3.6.pdf
June 03, 2022 380.85 KB
2015_2022-06-02_12:07:21_7.1_mi_N_of_Pittsburg_4.1.pdf
June 02, 2022 394.90 KB
2014_2022-05-31_19:00:01_11.5_mi_E_of_Cloverdale_3.2.pdf
May 31, 2022 310.48 KB
2013_2022-05-30_09:50:56_46.0_mi_W_of_Fortuna_3.5.pdf
May 30, 2022 123.67 KB
2012_2022-05-29_15:26:56_65.4_mi_SE_of_Tijuana_B.C._3.7.pdf
May 29, 2022 203.81 KB
2011_2022-05-26_09:23:32_14.9_mi_E_of_Ridgecrest_4.3.pdf
May 26, 2022 278.43 KB
2010_2022-05-16_06:16:50_4.6_mi_NE_of_Desert_Hot_Springs_3.7.pdf
May 16, 2022 317.64 KB
2009_2022-05-14_21:28:14_9.8_mi_S_of_Maricopa_3.2.pdf
May 14, 2022 318.50 KB
2008_2022-05-13_13:32:36_19.7_mi_SE_of_Temecula_3.7.pdf
May 13, 2022 386.10 KB
2007_2022-05-09_21:35:33_38.4_mi_E_of_Santee_3.6.pdf
May 09, 2022 335.11 KB
2006_2022-05-01_03:17:37_11.0_mi_E_of_Cloverdale_3.4.pdf
May 01, 2022 311.40 KB
2005_2022-04-30_18:17:56_11.7_mi_E_of_Cloverdale_3.5.pdf
April 30, 2022 311.65 KB
2004_2022-04-22_05:02:34_13.2_mi_SE_of_Hollister_3.5.pdf
April 22, 2022 331.68 KB
2003_2022-04-21_18:58:50_5.0_mi_NE_of_Imperial_3.6.pdf
April 21, 2022 279.24 KB
2002_2022-04-20_05:19:44_4.2_mi_S_of_Brawley_3.5.pdf
April 20, 2022 280.64 KB
2001_2022-04-20_03:56:46_4.0_mi_S_of_Brawley_3.2.pdf
April 20, 2022 279.63 KB
2000_2022-04-19_20:30:08_4.5_mi_S_of_Brawley_3.9.pdf
April 19, 2022 283.09 KB
1999_2022-04-19_20:22:41_3.9_mi_S_of_Brawley_3.6.pdf
April 19, 2022 279.44 KB
1998_2022-04-19_05:00:09_1.9_mi_SE_of_Cloverdale_3.3.pdf
April 19, 2022 301.06 KB
1997_2022-04-19_00:27:35_23.1_mi_SE_of_Mexicali_B.C._2.9.pdf
April 19, 2022 259.59 KB
1996_2022-04-18_22:35:34_21.0_mi_SE_of_Mexicali_B.C._3.5.pdf
April 18, 2022 269.45 KB
1995_2022-04-18_22:22:13_19.9_mi_SE_of_Mexicali_B.C._3.0.pdf
April 18, 2022 266.28 KB
1994_2022-04-18_02:08:59_10.7_mi_E_of_Cloverdale_3.0.pdf
April 18, 2022 311.35 KB
1993_2022-04-17_05:38:26_72.8_mi_SW_of_Mexicali_B.C._3.6.pdf
April 17, 2022 178.19 KB
1992_post_event_summary.pdf
April 15, 2022 196.13 KB
1991_2022-04-15_04:30:55_43.1_mi_S_of_Tijuana_B.C._4.7.pdf
April 15, 2022 245.53 KB
1990_2022-04-11_23:40:20_8.2_mi_NW_of_Calipatria_3.2.pdf
April 11, 2022 300.74 KB
1989_2022-04-04_15:18:31_5.3_mi_W_of_Rio_Dell_3.9.pdf
April 04, 2022 251.23 KB
1988_2022-04-04_15:16:46_5.1_mi_W_of_Rio_Dell_4.0.pdf
April 04, 2022 250.55 KB