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