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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2328_2024-05-12_18:33:44_20.3_mi_SE_of_Mexicali_B.C._4.0.pdf
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May 12, 2024 | 263.07 KB | |
2327_2024-05-12_18:22:42_19.2_mi_SE_of_Mexicali_B.C._4.6.pdf
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May 12, 2024 | 283.62 KB | |
2326_2024-05-08_01:14:36_21.9_mi_SE_of_Mexicali_B.C._3.9.pdf
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May 08, 2024 | 270.78 KB | |
2325_2024-05-01_20:49:00_5.6_mi_SW_of_Corona_4.1.pdf
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May 01, 2024 | 353.54 KB | |
2324_2024-04-24_13:35:34_33.6_mi_W_of_Fortuna_3.3.pdf
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April 24, 2024 | 173.57 KB | |
2323_2024-04-18_19:19:17_25.2_mi_N_of_Tehachapi_4.3.pdf
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April 18, 2024 | 294.29 KB | |
2322_2024-04-13_16:08:38_19.8_mi_S_of_La_Quinta_3.8.pdf
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April 13, 2024 | 277.56 KB | |
2321_2024-04-12_17:07:32_52.5_mi_W_of_Fortuna_4.0.pdf
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April 12, 2024 | 160.74 KB | |
2320_2024-04-09_02:26:27_23.0_mi_SE_of_Mexicali_B.C._3.1.pdf
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April 09, 2024 | 247.06 KB | |
2319_2024-04-08_15:45:39_13.2_mi_NE_of_Healdsburg_3.4.pdf
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April 08, 2024 | 274.34 KB | |
2318_2024-04-05_01:34:49_34.6_mi_NE_of_Chico_4.3.pdf
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April 05, 2024 | 319.34 KB | |
2317_2024-04-05_01:34:24_35.0_mi_NE_of_Chico_4.9.pdf
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April 05, 2024 | 297.73 KB | |
2316_2024-04-04_06:50:49_10.6_mi_E_of_Cloverdale_3.0.pdf
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April 04, 2024 | 266.11 KB | |
2314_2024-03-20_15:09:49_36.2_mi_N_of_Tehachapi_3.4.pdf
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March 20, 2024 | 264.03 KB | |
2313_2024-03-18_23:57:26_13.7_mi_NE_of_Gonzales_3.4.pdf
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March 19, 2024 | 255.48 KB | |
2311_2024-03-16_11:19:58_23.8_mi_SW_of_Rio_Dell_2.7.pdf
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March 17, 2024 | 175.96 KB | |
2310_2024-02-29_02:21:45_8.8_mi_SE_of_Oakley_3.8.pdf
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February 29, 2024 | 325.18 KB | |
2309_2024-02-26_17:25:43_40.7_mi_NE_of_Emmett_4.9.pdf
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February 26, 2024 | 266.05 KB | |
2308_2024-02-26_12:44:31_34.2_mi_W_of_Rio_Dell_2.7.pdf
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February 26, 2024 | 177.75 KB | |
2307_2024-02-21_14:01:32_2.5_mi_S_of_Parkfield_3.7.pdf
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February 21, 2024 | 253.65 KB | |
2306_2024-02-16_07:38:40_4.3_mi_S_of_Rancho_Cucamonga_3.8.pdf
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February 16, 2024 | 330.60 KB | |
2305_2024-02-14_07:53:13_6.1_mi_N_of_Westmorland_3.9.pdf
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February 14, 2024 | 292.34 KB | |
2304_2024-02-12_23:54:43_9.0_mi_W_of_Bishop_3.9.pdf
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February 13, 2024 | 251.92 KB | |
2303_2024-02-12_10:18:36_0.6_mi_SE_of_El_Centro_3.6.pdf
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February 12, 2024 | 260.79 KB | |
2302_2024-02-12_08:59:51_0.6_mi_W_of_El_Centro_4.0.pdf
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February 12, 2024 | 265.27 KB | |
2301_2024-02-12_08:42:43_1.6_mi_S_of_Imperial_2.4.pdf
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February 12, 2024 | 283.17 KB | |
2300_2024-02-12_08:38:26_2.0_mi_NW_of_El_Centro_3.7.pdf
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February 12, 2024 | 279.38 KB | |
2299_2024-02-12_08:36:25_1.7_mi_NW_of_El_Centro_4.8.pdf
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February 12, 2024 | 302.41 KB | |
2298_2024-02-10_09:49:44_41.1_mi_SE_of_Mexicali_B.C._3.2.pdf
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February 10, 2024 | 220.41 KB | |
2297_2024-02-10_07:20:19_24.3_mi_SW_of_Rio_Dell_4.0.pdf
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February 10, 2024 | 197.38 KB | |
2296_2024-02-09_21:47:27_7.2_mi_NW_of_Malibu_4.5.pdf
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February 09, 2024 | 291.87 KB | |
2295_2024-02-09_09:54:34_40.6_mi_SW_of_Fortuna_2.9.pdf
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February 09, 2024 | 176.04 KB | |
2294_post_event_summary.pdf
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February 09, 2024 | 180.53 KB | |
2293_2024-02-07_09:36:37_26.1_mi_SW_of_Susanville_3.6.pdf
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February 07, 2024 | 265.55 KB | |
2292_2024-02-05_08:56:19_18.6_mi_S_of_Mexicali_B.C._3.7.pdf
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February 05, 2024 | 216.42 KB | |
2290_2024-02-05_00:45:37_10.0_mi_SW_of_Ukiah_3.2.pdf
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February 05, 2024 | 250.53 KB | |
2291_2024-02-05_01:06:53_22.1_mi_NE_of_Tehachapi_3.8.pdf
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February 05, 2024 | 271.60 KB | |
2290_post_event_summary.pdf
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February 05, 2024 | 254.99 KB | |
2289_post_event_summary.pdf
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February 03, 2024 | 142.57 KB | |
2288_2024-02-02_15:08:59_65.8_mi_W_of_Fortuna_5.0.pdf
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February 02, 2024 | 172.35 KB | |
2287_2024-02-01_17:32:54_12.7_mi_S_of_Hollister_3.4.pdf
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February 01, 2024 | 260.99 KB | |
2286_2024-01-28_12:07:40_6.5_mi_N_of_Westmorland_2.9.pdf
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January 28, 2024 | 233.43 KB | |
2285_2024-01-28_06:30:14_57.0_mi_W_of_Fortuna_3.3.pdf
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January 28, 2024 | 160.16 KB | |
2284_2024-01-26_21:28:13_13.6_mi_SW_of_Clearlake_4.0.pdf
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January 26, 2024 | 316.82 KB | |
2283_2024-01-26_16:42:04_11.9_mi_E_of_Cloverdale_3.1.pdf
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January 26, 2024 | 275.00 KB | |
2282_2024-01-25_03:43:19_1.2_mi_W_of_San_Bernardino_4.4.pdf
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January 25, 2024 | 332.59 KB | |
2281_2024-01-23_05:26:10_11.9_mi_S_of_Fort_Jones_4.1.pdf
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January 23, 2024 | 220.49 KB | |
2280_2024-01-15_10:44:10_61.6_mi_S_of_Avalon_4.5.pdf
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January 15, 2024 | 202.87 KB | |
2279_2024-01-12_16:24:46_12.5_mi_S_of_Hollister_3.1.pdf
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January 12, 2024 | 265.89 KB | |
2278_2024-01-06_18:32:47_13.4_mi_N_of_Ukiah_3.5.pdf
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January 06, 2024 | 261.62 KB |