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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
2363_2024-06-16_07:19:02_10.9_mi_NE_of_Ridgecrest_3.3.pdf
June 16, 2024 316.21 KB
2362_2024-06-09_09:25:14_3.6_mi_SW_of_Gilroy_3.0.pdf
June 09, 2024 341.38 KB
2361_2024-06-08_19:34:28_13.0_mi_E_of_Cloverdale_4.3.pdf
June 08, 2024 313.70 KB
2360_2024-06-07_16:26:30_47.7_mi_W_of_Eureka_4.2.pdf
June 07, 2024 178.01 KB
2359_2024-06-06_23:52:21_4.8_mi_SW_of_Newport_Beach_3.6.pdf
June 07, 2024 254.31 KB
2359_2024-06-06_23:52:24_1.1_mi_SE_of_Costa_Mesa_3.6.pdf
June 06, 2024 240.74 KB
2356_2024-06-05_07:11:03_26.9_mi_SE_of_Mexicali_B.C._2.6.pdf
June 05, 2024 218.39 KB
2358_2024-06-05_11:58:40_22.1_mi_SE_of_Mexicali_B.C._4.6.pdf
June 05, 2024 277.47 KB
2357_2024-06-05_08:42:39_21.6_mi_SE_of_Mexicali_B.C._4.4.pdf
June 05, 2024 242.07 KB
2356_2024-06-05_07:11:04_25.2_mi_SE_of_Mexicali_B.C._2.5.pdf
June 05, 2024 216.84 KB
2355_2024-06-05_00:58:01_48.9_mi_W_of_Fortuna_2.6.pdf
June 05, 2024 164.08 KB
2354_2024-06-02_10:35:16_7.4_mi_E_of_Milpitas_3.6.pdf
June 02, 2024 351.34 KB
2353_2024-06-02_03:00:58_32.4_mi_SE_of_Mexicali_B.C._3.3.pdf
June 02, 2024 235.76 KB
2352_2024-05-31_17:26:53_3.6_mi_NE_of_Ojai_3.8.pdf
May 31, 2024 258.19 KB
2351_2024-05-28_07:47:33_81.4_mi_S_of_Mexicali_B.C._4.2.pdf
May 28, 2024 198.83 KB
2350_2024-05-27_14:03:17_29.4_mi_SW_of_Susanville_3.7.pdf
May 27, 2024 276.69 KB
2349_2024-05-27_11:05:46_67.7_mi_S_of_Mexicali_B.C._4.2.pdf
May 27, 2024 220.97 KB
2348_2024-05-20_12:17:36_22.1_mi_W_of_Westmorland_4.3.pdf
May 20, 2024 302.78 KB
2347_2024-05-19_17:23:35_8.6_mi_NE_of_Ridgecrest_3.3.pdf
May 19, 2024 279.91 KB
2346_2024-05-18_23:13:26_2.8_mi_S_of_Brawley_3.5.pdf
May 18, 2024 264.80 KB
2345_2024-05-18_23:05:05_3.1_mi_S_of_Brawley_3.7.pdf
May 18, 2024 258.36 KB
2344_2024-05-18_22:58:19_3.6_mi_S_of_Brawley_3.6.pdf
May 18, 2024 282.43 KB
2343_2024-05-18_19:46:17_3.4_mi_S_of_Brawley_3.5.pdf
May 18, 2024 261.65 KB
2342_2024-05-18_19:17:22_3.4_mi_S_of_Brawley_3.6.pdf
May 18, 2024 250.25 KB
2341_2024-05-18_16:30:18_2.6_mi_S_of_Brawley_3.6.pdf
May 18, 2024 263.46 KB
2340_2024-05-18_15:52:13_2.5_mi_S_of_Brawley_3.6.pdf
May 18, 2024 254.66 KB
2339_2024-05-18_12:41:52_2.8_mi_S_of_Brawley_3.6.pdf
May 18, 2024 273.26 KB
2338_2024-05-18_09:36:37_2.9_mi_S_of_Brawley_3.6.pdf
May 18, 2024 243.61 KB
2337_2024-05-15_06:39:03_6.1_mi_SE_of_Blue_Lake_3.9.pdf
May 15, 2024 257.75 KB
2336_2024-05-14_18:56:44_22.9_mi_SE_of_Mexicali_B.C._3.6.pdf
May 14, 2024 244.29 KB
2335_2024-05-13_04:07:34_20.8_mi_SE_of_Mexicali_B.C._3.6.pdf
May 13, 2024 259.34 KB
2334_2024-05-13_04:02:18_20.5_mi_SE_of_Mexicali_B.C._4.0.pdf
May 13, 2024 267.28 KB
2333_2024-05-13_00:04:12_21.0_mi_SE_of_Mexicali_B.C._3.3.pdf
May 13, 2024 259.64 KB
2332_2024-05-12_19:03:59_22.9_mi_SE_of_Mexicali_B.C._4.1.pdf
May 12, 2024 266.28 KB
2331_2024-05-12_18:53:40_21.5_mi_SE_of_Mexicali_B.C._3.6.pdf
May 12, 2024 229.28 KB
2330_2024-05-12_18:45:00_19.6_mi_SE_of_Mexicali_B.C._3.6.pdf
May 12, 2024 247.39 KB
2329_2024-05-12_18:42:03_20.3_mi_SE_of_Mexicali_B.C._3.5.pdf
May 12, 2024 245.12 KB
2328_2024-05-12_18:33:44_20.3_mi_SE_of_Mexicali_B.C._4.0.pdf
May 12, 2024 263.07 KB
2327_2024-05-12_18:22:42_19.2_mi_SE_of_Mexicali_B.C._4.6.pdf
May 12, 2024 283.62 KB
2326_2024-05-08_01:14:36_21.9_mi_SE_of_Mexicali_B.C._3.9.pdf
May 08, 2024 270.78 KB
2325_2024-05-01_20:49:00_5.6_mi_SW_of_Corona_4.1.pdf
May 01, 2024 353.54 KB
2324_2024-04-24_13:35:34_33.6_mi_W_of_Fortuna_3.3.pdf
April 24, 2024 173.57 KB
2323_2024-04-18_19:19:17_25.2_mi_N_of_Tehachapi_4.3.pdf
April 18, 2024 294.29 KB
2322_2024-04-13_16:08:38_19.8_mi_S_of_La_Quinta_3.8.pdf
April 13, 2024 277.56 KB
2321_2024-04-12_17:07:32_52.5_mi_W_of_Fortuna_4.0.pdf
April 12, 2024 160.74 KB
2320_2024-04-09_02:26:27_23.0_mi_SE_of_Mexicali_B.C._3.1.pdf
April 09, 2024 247.06 KB
2319_2024-04-08_15:45:39_13.2_mi_NE_of_Healdsburg_3.4.pdf
April 08, 2024 274.34 KB
2318_2024-04-05_01:34:49_34.6_mi_NE_of_Chico_4.3.pdf
April 05, 2024 319.34 KB
2317_2024-04-05_01:34:24_35.0_mi_NE_of_Chico_4.9.pdf
April 05, 2024 297.73 KB