Post ShakeAlert Message Summaries provide information about earthquakes detected by the USGS component of ShakeAlert Earthquake Early Warning System (see graphic below). They summarize how accurately the ShakeAlert system estimated an earthquake’s location, magnitude, shaking intensities, how much warning time for selected nearby cities, and how many seismic stations contributed data to these estimates. Estimated warning times on the summaries does not include the additional time it takes for ShakeAlert Licensed Operators to deliver alerts to end-users (e.g. alert delivery to cell phones). Summaries are automatically generated for earthquakes with an estimated peak magnitude (M) of 3.5 or larger. For earthquakes estimated at M4.0 or larger, ShakeAlert Messages are human-reviewed and forwarded to the USGS Earthquake Hazards Program to be posted at www.earthquake.usgs.gov. ShakeAlert produces summaries for earthquakes less than M4.0 to test software readiness, but the 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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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 | |
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 |