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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
2188_2023-06-03_12:01:18_12.9_mi_E_of_Cloverdale_4.3.pdf
June 03, 2023 292.40 KB
2187_2023-06-02_00:23:04_10.1_mi_NW_of_Reno_3.9.pdf
June 02, 2023 303.19 KB
2186_2023-05-30_20:24:52_11.5_mi_SE_of_Port_Hueneme_3.2.pdf
May 30, 2023 229.72 KB
2185_post_event_summary.pdf
May 27, 2023 132.99 KB
2184_2023-05-26_11:26:24_28.4_mi_SW_of_Susanville_4.1.pdf
May 26, 2023 295.83 KB
2182_2023-05-21_03:26:29_44.7_mi_E_of_Bishop_4.1.pdf
May 23, 2023 244.30 KB
2183_2023-05-21_18:44:01_71.1_mi_W_of_Fortuna_5.5.pdf
May 21, 2023 179.66 KB
2156_2023-04-12_06:30:34_13.1_mi_E_of_Cloverdale_3.1.pdf
May 19, 2023 277.79 KB
2163_2023-04-20_03:35:47_5.5_mi_E_of_Clayton_3.7.pdf
May 19, 2023 355.28 KB
2176_2023-05-12_02:54:45_27.9_mi_SW_of_Susanville_3.9.pdf
May 19, 2023 274.19 KB
2177_2023-05-12_10:18:41_27.3_mi_SW_of_Susanville_5.3.pdf
May 12, 2023 338.14 KB
2175_2023-05-11_23:19:41_27.7_mi_SW_of_Susanville_5.7.pdf
May 11, 2023 323.67 KB
2174_2023-05-06_14:16:02_3.7_mi_NW_of_Calexico_3.5.pdf
May 06, 2023 280.79 KB
2173_2023-05-03_01:40:24_17.5_mi_N_of_Ridgecrest_3.5.pdf
May 03, 2023 295.42 KB
2172_2023-05-01_23:13:47_2.5_mi_SE_of_Point_Arena_3.7.pdf
May 01, 2023 243.75 KB
2171_2023-04-30_11:44:03_6.9_mi_NW_of_Calipatria_3.0.pdf
April 30, 2023 261.72 KB
2170_2023-04-30_07:58:19_6.9_mi_NW_of_Calipatria_3.6.pdf
April 30, 2023 321.71 KB
2169_2023-04-30_07:32:12_7.3_mi_NW_of_Calipatria_2.9.pdf
April 30, 2023 283.91 KB
2168_2023-04-30_07:19:17_7.9_mi_NW_of_Calipatria_2.8.pdf
April 30, 2023 262.80 KB
2167_2023-04-30_07:09:34_6.4_mi_NW_of_Calipatria_3.7.pdf
April 30, 2023 276.31 KB
2166_2023-04-29_21:06:47_3.2_mi_NW_of_Calexico_3.7.pdf
April 29, 2023 282.53 KB
2165_2023-04-29_12:07:03_3.8_mi_NW_of_Calexico_4.0.pdf
April 29, 2023 283.07 KB
2164_2023-04-28_03:40:16_2.3_mi_NW_of_Calexico_1.9.pdf
April 28, 2023 260.59 KB
2162_2023-04-17_15:27:56_17.4_mi_E_of_Barstow_3.4.pdf
April 17, 2023 261.97 KB
2161_2023-04-17_07:45:18_49.0_mi_SW_of_Goleta_3.7.pdf
April 17, 2023 217.17 KB
2160_2023-04-14_14:56:56_13.1_mi_SW_of_Mexicali_B.C._3.7.pdf
April 14, 2023 262.21 KB
2159_2023-04-13_07:42:10_12.6_mi_NE_of_Healdsburg_3.8.pdf
April 13, 2023 307.00 KB
2158_2023-04-13_07:38:45_13.3_mi_NE_of_Healdsburg_3.0.pdf
April 13, 2023 283.83 KB
2157_2023-04-13_03:00:25_11.4_mi_W_of_Ukiah_2.6.pdf
April 13, 2023 226.70 KB
2155_2023-04-12_05:39:51_11.5_mi_E_of_Cloverdale_4.1.pdf
April 12, 2023 320.21 KB
2154_2023-04-12_02:22:35_16.3_mi_E_of_Gonzales_3.3.pdf
April 12, 2023 291.41 KB
2153_2023-04-09_02:06:52_13.2_mi_SW_of_Mexicali_B.C._3.6.pdf
April 09, 2023 267.32 KB
2152_2023-04-08_21:25:15_10.2_mi_E_of_Cloverdale_3.1.pdf
April 08, 2023 269.16 KB
2151_2023-04-08_05:07:58_11.4_mi_E_of_Cloverdale_3.3.pdf
April 08, 2023 276.24 KB
2150_2023-04-05_11:31:54_93.2_mi_W_of_Eureka_2.9.pdf
April 05, 2023 165.08 KB
2149_2023-04-04_22:23:17_5.6_mi_SE_of_Hollister_4.7.pdf
April 04, 2023 345.96 KB
2148_2023-04-02_21:31:03_77.0_mi_S_of_Tijuana_B.C._3.9.pdf
April 02, 2023 194.95 KB
2147_2023-04-02_11:44:21_29.8_mi_SW_of_Fortuna_2.8.pdf
April 02, 2023 182.45 KB
2146_2023-04-01_16:43:33_2.1_mi_N_of_San_Leandro_3.2.pdf
April 01, 2023 360.91 KB
2145_2023-04-01_01:16:07_16.0_mi_SE_of_Temecula_4.5.pdf
April 01, 2023 350.94 KB
2144_2023-03-28_13:01:18_0.5_mi_NE_of_Pacifica_3.5.pdf
March 28, 2023 347.01 KB
2143_2023-03-23_03:38:53_11.4_mi_S_of_Hollister_3.4.pdf
March 23, 2023 285.53 KB
2142_2023-03-21_23:18:19_10.0_mi_SW_of_Fortuna_4.6.pdf
March 21, 2023 251.94 KB
2141_2023-03-18_17:19:33_17.5_mi_NW_of_Westmorland_3.4.pdf
March 18, 2023 243.06 KB
2140_2023-03-18_16:52:07_17.7_mi_NW_of_Westmorland_3.4.pdf
March 18, 2023 243.82 KB
2139_2023-03-18_14:23:06_25.1_mi_NE_of_Bishop_3.9.pdf
March 18, 2023 266.39 KB
2138_2023-03-18_07:03:42_26.1_mi_NE_of_Bishop_3.9.pdf
March 18, 2023 278.11 KB
2137_2023-03-15_18:29:41_32.7_mi_S_of_King_City_3.7.pdf
March 15, 2023 252.02 KB
2136_2023-03-14_19:15:55_11.9_mi_S_of_Hollister_3.0.pdf
March 14, 2023 288.76 KB
2135_2023-03-14_17:41:44_11.4_mi_S_of_Hollister_3.4.pdf
March 14, 2023 292.67 KB