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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2410_2024-10-09_09:44:47_12.4_mi_SE_of_Mexicali_B.C._3.0.pdf
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October 09, 2024 | 269.32 KB | |
2410_2024-10-09_09:44:47_12.0_mi_SE_of_Mexicali_B.C._3.2.pdf
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October 09, 2024 | 270.72 KB | |
2409_2024-10-09_06:05:43_13.0_mi_SE_of_Mexicali_B.C._3.2.pdf
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October 09, 2024 | 254.79 KB | |
2408_2024-10-08_16:27:34_116.7_mi_W_of_Fortuna_4.3.pdf
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October 08, 2024 | 154.64 KB | |
2408_post_event_summary.pdf
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October 08, 2024 | 135.83 KB | |
2407_2024-10-06_10:51:08_4.5_mi_N_of_Eastvale_4.0.pdf
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October 06, 2024 | 347.91 KB | |
2407_2024-10-06_10:51:08_4.6_mi_N_of_Eastvale_4.1.pdf
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October 06, 2024 | 349.02 KB | |
2406_2024-10-06_08:07:44_11.5_mi_E_of_Cloverdale_2.7.pdf
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October 06, 2024 | 261.24 KB | |
2406_2024-10-06_08:07:44_11.1_mi_E_of_Cloverdale_3.0.pdf
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October 06, 2024 | 260.60 KB | |
2405_post_event_summary.pdf
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October 05, 2024 | 137.73 KB | |
2404_2024-10-02_00:45:18_6.6_mi_NW_of_Avenal_4.0.pdf
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October 02, 2024 | 290.51 KB | |
2403_2024-10-01_19:56:21_4.6_mi_SE_of_Upland_3.5.pdf
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October 01, 2024 | 356.52 KB | |
2403_2024-10-01_19:56:21_4.7_mi_SE_of_Upland_3.1.pdf
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October 01, 2024 | 356.54 KB | |
2402_2024-09-29_09:47:33_5.5_mi_E_of_Watsonville_4.2.pdf
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September 29, 2024 | 313.25 KB | |
2402_2024-09-29_09:47:33_5.5_mi_E_of_Watsonville_4.4.pdf
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September 29, 2024 | 313.25 KB | |
2401_2024-09-28_15:32:04_37.7_mi_SE_of_South_Lake_Tahoe_3.6.pdf
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September 28, 2024 | 288.14 KB | |
2400_2024-09-26_18:24:28_44.4_mi_NW_of_Ridgecrest_3.7.pdf
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September 26, 2024 | 265.01 KB | |
2399_2024-09-26_11:05:20_8.9_mi_N_of_Oak_Bay_4.0.pdf
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September 26, 2024 | 292.43 KB | |
2398_2024-09-16_11:22:08_3.8_mi_N_of_Malibu_3.7.pdf
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September 16, 2024 | 293.94 KB | |
2398_2024-09-16_11:22:08_4.3_mi_N_of_Malibu_3.6.pdf
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September 16, 2024 | 293.89 KB | |
2397_2024-09-12_16:37:28_7.4_mi_SW_of_Malibu_3.2.pdf
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September 12, 2024 | 286.88 KB | |
2396_2024-09-12_14:28:19_4.8_mi_S_of_Malibu_4.7.pdf
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September 12, 2024 | 292.89 KB | |
2395_2024-09-10_07:01:03_13.2_mi_NE_of_Calistoga_2.9.pdf
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September 11, 2024 | 301.55 KB | |
2395_2024-09-10_07:01:04_8.7_mi_NE_of_Calistoga_3.4.pdf
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September 10, 2024 | 299.82 KB | |
2394_2024-09-07_17:34:20_4.9_mi_SE_of_Rancho_Cucamonga_3.9.pdf
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September 07, 2024 | 356.43 KB | |
2393_2024-09-07_17:05:45_4.4_mi_N_of_Eastvale_3.5.pdf
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September 07, 2024 | 350.04 KB | |
2392_2024-09-07_14:30:36_13.3_mi_NE_of_Healdsburg_4.3.pdf
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September 07, 2024 | 315.06 KB | |
2391_2024-09-06_12:07:06_26.4_mi_SE_of_South_Lake_Tahoe_3.7.pdf
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September 06, 2024 | 286.97 KB | |
2390_2024-08-15_16:39:31_3.7_mi_NW_of_Lake_Elsinore_3.5.pdf
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August 15, 2024 | 331.54 KB | |
2390_2024-08-15_16:39:31_3.7_mi_W_of_Lake_Elsinore_3.9.pdf
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August 15, 2024 | 331.46 KB | |
2389_2024-08-12_19:20:23_0.8_mi_SE_of_San_Marino_4.6.pdf
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August 12, 2024 | 337.75 KB | |
2388_2024-08-11_09:45:12_22.3_mi_N_of_Ridgecrest_3.8.pdf
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August 11, 2024 | 284.37 KB | |
2388_2024-08-11_09:45:13_22.6_mi_N_of_Ridgecrest_3.8.pdf
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August 11, 2024 | 268.84 KB | |
2387_2024-08-08_02:09:14_14.7_mi_SW_of_Arvin_4.6.pdf
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August 08, 2024 | 344.37 KB | |
2386_2024-08-07_23:43:32_16.3_mi_E_of_Maricopa_3.8.pdf
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August 08, 2024 | 329.40 KB | |
2386_2024-08-07_23:43:32_16.5_mi_E_of_Maricopa_3.9.pdf
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August 07, 2024 | 329.80 KB | |
2385_2024-08-07_10:39:19_16.2_mi_E_of_Maricopa_3.6.pdf
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August 07, 2024 | 286.10 KB | |
2385_2024-08-07_10:39:19_16.3_mi_E_of_Maricopa_3.5.pdf
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August 07, 2024 | 285.79 KB | |
2382_2024-08-07_06:52:28_16.9_mi_SW_of_Arvin_3.5.pdf
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August 07, 2024 | 276.71 KB | |
2383_post_event_summary.pdf
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August 07, 2024 | 294.17 KB | |
2384_post_event_summary.pdf
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August 07, 2024 | 294.17 KB | |
2382_2024-08-07_06:52:28_16.6_mi_SW_of_Arvin_3.5.pdf
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August 07, 2024 | 277.03 KB | |
2380_2024-08-07_04:09:55_14.1_mi_SW_of_Arvin_5.4.pdf
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August 07, 2024 | 358.34 KB | |
2381_2024-08-07_04:17:09_15.3_mi_SW_of_Arvin_4.2.pdf
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August 07, 2024 | 281.04 KB | |
2379_2024-07-29_20:00:51_15.5_mi_E_of_Barstow_4.8.pdf
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July 29, 2024 | 292.39 KB | |
2378_2024-07-21_22:09:51_10.6_mi_W_of_Rancho_Palos_Verdes_3.5.pdf
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July 21, 2024 | 228.01 KB | |
2377_2024-07-17_21:59:27_31.5_mi_S_of_La_Quinta_3.5.pdf
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July 17, 2024 | 281.24 KB | |
2376_2024-07-11_16:55:39_12.4_mi_SW_of_Coronado_2.8.pdf
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July 11, 2024 | 206.37 KB |