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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2084_2022-12-05_23:13:16_11.4_mi_E_of_San_Jose_3.7.pdf
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December 05, 2022 | 384.20 KB | |
2083_2022-12-02_12:21:48_14.4_mi_S_of_Bishop_4.0.pdf
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December 02, 2022 | 327.22 KB | |
2082_2022-12-01_15:28:29_26.8_mi_W_of_Imperial_4.0.pdf
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December 01, 2022 | 301.46 KB | |
2081_2022-11-26_03:50:17_68.5_mi_W_of_Port_Alberni_4.8.pdf
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November 26, 2022 | 263.36 KB | |
2080_2022-11-14_20:27:18_12.4_mi_E_of_Cloverdale_3.1.pdf
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November 14, 2022 | 314.20 KB | |
2079_2022-11-08_17:35:07_21.1_mi_SW_of_Rio_Dell_2.6.pdf
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November 08, 2022 | 216.15 KB | |
2078_2022-11-07_05:10:26_77.0_mi_S_of_Mexicali_B.C._3.7.pdf
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November 07, 2022 | 160.85 KB | |
2077_2022-11-07_04:59:02_77.8_mi_S_of_Mexicali_B.C._4.3.pdf
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November 07, 2022 | 175.47 KB | |
2076_2022-11-07_02:01:27_13.7_mi_E_of_Willits_3.8.pdf
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November 07, 2022 | 306.61 KB | |
2075_2022-11-04_20:27:36_12.1_mi_E_of_Cloverdale_2.9.pdf
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November 04, 2022 | 312.40 KB | |
2074_2022-11-04_20:26:32_12.1_mi_E_of_Cloverdale_3.4.pdf
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November 04, 2022 | 310.81 KB | |
2073_2022-10-25_22:08:37_12.1_mi_E_of_San_Jose_3.6.pdf
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October 25, 2022 | 369.63 KB | |
2072_2022-10-25_18:42:02_12.1_mi_E_of_San_Jose_5.0.pdf
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October 25, 2022 | 374.01 KB | |
2071_2022-10-23_18:16:22_2.2_mi_E_of_Fortuna_4.3.pdf
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October 23, 2022 | 267.05 KB | |
2070_2022-10-21_18:50:26_11.0_mi_E_of_Cloverdale_2.9.pdf
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October 21, 2022 | 308.13 KB | |
2069_2022-10-20_07:55:16_32.6_mi_E_of_Rio_Dell_4.1.pdf
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October 20, 2022 | 298.78 KB | |
2068_2022-10-20_00:02:34_11.2_mi_E_of_Cloverdale_3.4.pdf
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October 20, 2022 | 312.48 KB | |
2067_2022-10-19_23:59:49_12.2_mi_SW_of_Clearlake_3.4.pdf
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October 20, 2022 | 313.00 KB | |
2066_2022-10-19_23:59:04_10.9_mi_E_of_Cloverdale_3.5.pdf
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October 20, 2022 | 312.05 KB | |
2065_2022-10-15_17:30:41_13.5_mi_NE_of_Healdsburg_3.2.pdf
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October 15, 2022 | 319.95 KB | |
2064_2022-10-11_06:19:06_103.1_mi_SE_of_Mexicali_B.C._3.8.pdf
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October 12, 2022 | 154.00 KB | |
2063_2022-10-07_22:45:05_38.3_mi_E_of_Santee_3.5.pdf
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October 07, 2022 | 341.02 KB | |
2062_2022-10-07_12:52:35_17.4_mi_E_of_Lebanon_4.4.pdf
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October 07, 2022 | 325.21 KB | |
2061_2022-10-04_16:38:34_22.3_mi_SE_of_Mexicali_B.C._3.5.pdf
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October 04, 2022 | 263.83 KB | |
2060_2022-10-01_02:02:32_48.6_mi_SW_of_Sooke_2.8.pdf
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October 01, 2022 | 228.65 KB | |
2059_2022-09-27_08:03:39_26.3_mi_N_of_Tehachapi_3.7.pdf
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September 27, 2022 | 276.07 KB | |
2058_2022-09-26_05:18:31_12.2_mi_SW_of_Clearlake_2.7.pdf
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September 26, 2022 | 317.76 KB | |
2057_2022-09-24_19:27:37_38.9_mi_W_of_Rio_Dell_4.6.pdf
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September 24, 2022 | 158.95 KB | |
2044_2022-09-04_18:57:55_17.2_mi_E_of_Gonzales_3.5.pdf
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September 23, 2022 | 316.00 KB | |
2056_2022-09-23_06:58:34_13.8_mi_S_of_Clearlake_3.3.pdf
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September 23, 2022 | 323.12 KB | |
2055_post_event_summary.pdf
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September 22, 2022 | 296.00 KB | |
2053_2022-09-20_23:49:57_7.3_mi_NW_of_Calipatria_1.8.pdf
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September 21, 2022 | 295.66 KB | |
2054_2022-09-21_02:43:10_22.6_mi_SW_of_Rio_Dell_3.8.pdf
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September 21, 2022 | 228.69 KB | |
2052_2022-09-20_22:41:41_7.2_mi_NW_of_Calipatria_2.3.pdf
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September 20, 2022 | 296.67 KB | |
2051_2022-09-20_14:03:08_28.3_mi_N_of_Willits_3.9.pdf
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September 20, 2022 | 298.03 KB | |
2050_2022-09-18_06:55:48_14.8_mi_E_of_Coachella_3.5.pdf
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September 18, 2022 | 291.30 KB | |
2049_2022-09-16_16:12:42_38.8_mi_SE_of_South_Lake_Tahoe_3.9.pdf
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September 16, 2022 | 334.42 KB | |
2048_2022-09-15_20:07:05_12.7_mi_SW_of_Los_Banos_3.3.pdf
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September 15, 2022 | 312.66 KB | |
2047_2022-09-14_01:39:39_4.0_mi_NE_of_Santa_Rosa_4.4.pdf
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September 14, 2022 | 340.26 KB | |
2046_2022-09-09_12:56:14_13.7_mi_NE_of_Healdsburg_3.0.pdf
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September 09, 2022 | 314.15 KB | |
2045_2022-09-08_08:08:25_7.5_mi_N_of_Bangor_Trident_Base_3.8.pdf
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September 08, 2022 | 342.88 KB | |
2043_2022-09-03_17:04:55_4.0_mi_N_of_Eastvale_3.6.pdf
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September 06, 2022 | 403.84 KB | |
2042_2022-09-01_13:36:22_17.4_mi_NE_of_Greenfield_4.0.pdf
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September 02, 2022 | 314.90 KB | |
2041_2022-08-30_08:44:40_21.8_mi_SE_of_Mexicali_B.C._3.9.pdf
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August 30, 2022 | 280.63 KB | |
2040_2022-08-13_12:33:35_9.7_mi_S_of_Blue_Lake_3.7.pdf
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August 13, 2022 | 291.08 KB | |
2039_2022-08-08_20:44:14_37.5_mi_SE_of_South_Lake_Tahoe_4.7.pdf
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August 08, 2022 | 327.60 KB | |
2038_2022-08-02_21:44:06_28.0_mi_SW_of_Rio_Dell_3.9.pdf
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August 02, 2022 | 188.09 KB | |
2037_post_event_summary.pdf
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August 01, 2022 | 106.18 KB | |
2036_2022-07-28_20:49:30_44.6_mi_W_of_Fortuna_2.5.pdf
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July 30, 2022 | 120.69 KB | |
2035_post_event_summary.pdf
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July 28, 2022 | 209.92 KB |