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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2104_2023-01-01_05:18:17_6.7_mi_N_of_Fortuna_2.9.pdf
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January 01, 2023 | 247.30 KB | |
2103_2022-12-31_12:12:26_17.8_mi_S_of_La_Quinta_4.2.pdf
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December 31, 2022 | 349.85 KB | |
2102_2022-12-31_11:41:09_7.8_mi_N_of_Big_Bear_Lake_3.5.pdf
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December 31, 2022 | 326.55 KB | |
2101_2022-12-24_19:33:44_6.5_mi_NE_of_Rio_Dell_4.2.pdf
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December 24, 2022 | 289.83 KB | |
2089_2022-12-20_10:34:25_13.4_mi_SW_of_Fortuna_6.1.pdf
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December 24, 2022 | 245.48 KB | |
2100_2022-12-24_05:13:07_21.2_mi_SW_of_Rio_Dell_3.1.pdf
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December 24, 2022 | 203.06 KB | |
2099_2022-12-22_08:47:13_13.8_mi_W_of_Fortuna_3.7.pdf
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December 22, 2022 | 221.94 KB | |
2098_2022-12-22_02:22:50_2.0_mi_NE_of_Union_City_3.3.pdf
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December 22, 2022 | 410.22 KB | |
2097_2022-12-21_16:28:16_4.6_mi_E_of_Fortuna_3.7.pdf
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December 21, 2022 | 275.31 KB | |
2096_2022-12-21_01:07:33_19.2_mi_W_of_Fortuna_3.4.pdf
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December 21, 2022 | 203.25 KB | |
2095_2022-12-20_22:06:34_7.5_mi_SW_of_Fortuna_4.3.pdf
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December 20, 2022 | 241.93 KB | |
2094_2022-12-20_15:09:05_4.8_mi_E_of_Fortuna_4.0.pdf
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December 20, 2022 | 277.87 KB | |
2093_2022-12-20_13:53:19_12.6_mi_SW_of_Fortuna_3.5.pdf
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December 20, 2022 | 222.72 KB | |
2092_2022-12-20_13:35:06_9.4_mi_SW_of_Fortuna_3.8.pdf
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December 20, 2022 | 235.69 KB | |
2091_2022-12-20_10:52:39_7.5_mi_W_of_Fortuna_3.4.pdf
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December 20, 2022 | 239.56 KB | |
2090_2022-12-20_10:39:02_3.7_mi_W_of_Rio_Dell_4.6.pdf
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December 20, 2022 | 264.27 KB | |
2088_2022-12-17_11:39:42_0.7_mi_NE_of_El_Cerrito_3.9.pdf
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December 17, 2022 | 382.60 KB | |
2087_2022-12-09_05:33:33_12.4_mi_E_of_Cloverdale_2.8.pdf
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December 09, 2022 | 316.16 KB | |
2086_2022-12-07_14:13:22_26.3_mi_N_of_Tehachapi_3.5.pdf
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December 07, 2022 | 291.17 KB | |
2085_2022-12-06_00:10:37_8.2_mi_SE_of_Avenal_4.2.pdf
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December 06, 2022 | 295.74 KB | |
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 |