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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2134_2023-03-14_10:13:19_25.3_mi_NE_of_Bishop_3.9.pdf
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March 14, 2023 | 270.87 KB | |
2133_2023-03-14_05:00:29_25.2_mi_NE_of_Bishop_4.0.pdf
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March 14, 2023 | 273.17 KB | |
2132_2023-03-10_06:50:29_23.5_mi_SE_of_Mexicali_B.C._2.4.pdf
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March 10, 2023 | 221.03 KB | |
2131_2023-03-07_14:33:12_14.8_mi_NE_of_Gonzales_3.9.pdf
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March 07, 2023 | 302.79 KB | |
2130_2023-03-02_21:16:50_12.7_mi_E_of_Cloverdale_3.6.pdf
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March 02, 2023 | 312.23 KB | |
2129_2023-03-02_21:16:17_13.0_mi_E_of_Cloverdale_3.4.pdf
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March 02, 2023 | 292.59 KB | |
2128_2023-03-01_07:09:40_11.1_mi_E_of_Cloverdale_3.4.pdf
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March 01, 2023 | 290.70 KB | |
2127_2023-02-28_03:36:34_11.0_mi_E_of_Cloverdale_2.9.pdf
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February 28, 2023 | 280.71 KB | |
2126_2023-02-22_20:01:57_8.9_mi_E_of_Cloverdale_3.2.pdf
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February 22, 2023 | 277.60 KB | |
2125_2023-02-09_17:43:05_13.5_mi_SW_of_Clearlake_2.8.pdf
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February 09, 2023 | 312.57 KB | |
2124_2023-02-09_10:13:20_22.2_mi_E_of_Arroyo_Grande_2.6.pdf
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February 09, 2023 | 275.61 KB | |
2123_2023-02-06_09:53:42_17.7_mi_W_of_Fortuna_2.9.pdf
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February 06, 2023 | 210.29 KB | |
2122_2023-02-02_00:11:01_2.3_mi_NW_of_San_Fernando_2.9.pdf
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February 02, 2023 | 357.80 KB | |
2121_2023-01-28_23:56:59_11.4_mi_SW_of_Fortuna_3.8.pdf
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January 29, 2023 | 226.72 KB | |
2120_2023-01-27_10:28:22_2.1_mi_SE_of_Fortuna_3.7.pdf
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January 27, 2023 | 266.66 KB | |
2119_2023-01-25_10:03:33_10.1_mi_SE_of_Malibu_3.5.pdf
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January 25, 2023 | 309.23 KB | |
2118_2023-01-25_10:00:54_10.4_mi_SE_of_Malibu_4.2.pdf
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January 25, 2023 | 312.64 KB | |
2117_2023-01-23_13:58:02_7.7_mi_N_of_Gilroy_3.7.pdf
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January 23, 2023 | 359.04 KB | |
2116_2023-01-21_03:27:50_12.4_mi_E_of_Cloverdale_3.3.pdf
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January 21, 2023 | 316.36 KB | |
2115_2023-01-20_08:01:14_14.7_mi_E_of_Trinidad_4.2.pdf
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January 20, 2023 | 286.08 KB | |
2114_2023-01-20_01:18:07_5.7_mi_SW_of_Cloverdale_3.6.pdf
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January 20, 2023 | 293.20 KB | |
2113_2023-01-19_20:30:07_14.3_mi_E_of_Trinidad_3.4.pdf
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January 19, 2023 | 279.80 KB | |
2112_2023-01-19_19:21:41_2.4_mi_S_of_San_Juan_Bautista_3.3.pdf
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January 19, 2023 | 342.49 KB | |
2111_2023-01-19_17:15:55_2.6_mi_S_of_San_Juan_Bautista_3.8.pdf
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January 19, 2023 | 342.18 KB | |
2110_2023-01-13_10:02:52_13.0_mi_W_of_Fortuna_3.9.pdf
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January 13, 2023 | 225.64 KB | |
2109_2023-01-11_17:21:42_41.4_mi_W_of_Fortuna_3.9.pdf
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January 11, 2023 | 166.48 KB | |
2108_2023-01-10_18:32:14_4.8_mi_NW_of_Blue_Lake_3.5.pdf
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January 10, 2023 | 266.73 KB | |
2107_2023-01-01_18:35:04_9.3_mi_SE_of_Rio_Dell_4.9.pdf
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January 01, 2023 | 265.72 KB | |
2106_2023-01-01_06:49:08_13.4_mi_E_of_Gonzales_4.1.pdf
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January 01, 2023 | 321.32 KB | |
2105_2023-01-01_06:19:31_14.8_mi_NE_of_Gonzales_3.2.pdf
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January 01, 2023 | 320.03 KB | |
2104_2023-01-01_05:18:17_6.7_mi_N_of_Fortuna_2.9.pdf
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January 01, 2023 | 247.30 KB | |
2103_2022-12-31_12:12:26_17.8_mi_S_of_La_Quinta_4.2.pdf
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December 31, 2022 | 349.85 KB | |
2102_2022-12-31_11:41:09_7.8_mi_N_of_Big_Bear_Lake_3.5.pdf
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December 31, 2022 | 326.55 KB | |
2101_2022-12-24_19:33:44_6.5_mi_NE_of_Rio_Dell_4.2.pdf
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December 24, 2022 | 289.83 KB | |
2089_2022-12-20_10:34:25_13.4_mi_SW_of_Fortuna_6.1.pdf
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December 24, 2022 | 245.48 KB | |
2100_2022-12-24_05:13:07_21.2_mi_SW_of_Rio_Dell_3.1.pdf
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December 24, 2022 | 203.06 KB | |
2099_2022-12-22_08:47:13_13.8_mi_W_of_Fortuna_3.7.pdf
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December 22, 2022 | 221.94 KB | |
2098_2022-12-22_02:22:50_2.0_mi_NE_of_Union_City_3.3.pdf
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December 22, 2022 | 410.22 KB | |
2097_2022-12-21_16:28:16_4.6_mi_E_of_Fortuna_3.7.pdf
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December 21, 2022 | 275.31 KB | |
2096_2022-12-21_01:07:33_19.2_mi_W_of_Fortuna_3.4.pdf
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December 21, 2022 | 203.25 KB | |
2095_2022-12-20_22:06:34_7.5_mi_SW_of_Fortuna_4.3.pdf
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December 20, 2022 | 241.93 KB | |
2094_2022-12-20_15:09:05_4.8_mi_E_of_Fortuna_4.0.pdf
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December 20, 2022 | 277.87 KB | |
2093_2022-12-20_13:53:19_12.6_mi_SW_of_Fortuna_3.5.pdf
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December 20, 2022 | 222.72 KB | |
2092_2022-12-20_13:35:06_9.4_mi_SW_of_Fortuna_3.8.pdf
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December 20, 2022 | 235.69 KB | |
2091_2022-12-20_10:52:39_7.5_mi_W_of_Fortuna_3.4.pdf
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December 20, 2022 | 239.56 KB | |
2090_2022-12-20_10:39:02_3.7_mi_W_of_Rio_Dell_4.6.pdf
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December 20, 2022 | 264.27 KB | |
2088_2022-12-17_11:39:42_0.7_mi_NE_of_El_Cerrito_3.9.pdf
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December 17, 2022 | 382.60 KB | |
2087_2022-12-09_05:33:33_12.4_mi_E_of_Cloverdale_2.8.pdf
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December 09, 2022 | 316.16 KB | |
2086_2022-12-07_14:13:22_26.3_mi_N_of_Tehachapi_3.5.pdf
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December 07, 2022 | 291.17 KB | |
2085_2022-12-06_00:10:37_8.2_mi_SE_of_Avenal_4.2.pdf
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December 06, 2022 | 295.74 KB |