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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2236_2023-09-27_20:00:21_36.2_mi_SE_of_South_Lake_Tahoe_3.6.pdf
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September 27, 2023 | 278.32 KB | |
2215_2023-08-13_15:28:58_10.3_mi_SW_of_Trinidad_3.7.pdf
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September 21, 2023 | 219.93 KB | |
2235_2023-09-19_04:13:10_9.0_mi_W_of_Patterson_4.6.pdf
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September 19, 2023 | 352.13 KB | |
2234_2023-09-19_00:15:32_8.9_mi_W_of_Patterson_4.1.pdf
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September 19, 2023 | 311.12 KB | |
2233_2023-09-18_06:20:52_12.0_mi_E_of_Cloverdale_3.5.pdf
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September 18, 2023 | 316.97 KB | |
2232_2023-09-14_02:43:54_15.6_mi_E_of_Gonzales_3.4.pdf
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September 14, 2023 | 259.21 KB | |
2231_2023-09-08_17:24:38_41.2_mi_SE_of_Dunsmuir_4.9.pdf
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September 08, 2023 | 328.02 KB | |
2230_2023-08-29_08:05:33_33.4_mi_SE_of_Avalon_4.0.pdf
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August 29, 2023 | 211.00 KB | |
2229_2023-08-24_14:57:03_4.1_mi_SE_of_Ojai_3.4.pdf
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August 24, 2023 | 245.29 KB | |
2228_2023-08-22_11:39:19_5.1_mi_SE_of_Ojai_4.0.pdf
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August 22, 2023 | 294.24 KB | |
2227_2023-08-21_23:50:25_3.4_mi_SE_of_Ojai_3.5.pdf
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August 21, 2023 | 259.70 KB | |
2226_2023-08-21_05:41:23_3.5_mi_SE_of_Ojai_3.2.pdf
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August 21, 2023 | 259.49 KB | |
2225_2023-08-21_05:25:17_4.3_mi_SE_of_Ojai_3.6.pdf
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August 21, 2023 | 270.82 KB | |
2224_2023-08-20_22:55:15_4.9_mi_E_of_Ojai_3.2.pdf
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August 20, 2023 | 273.39 KB | |
2223_2023-08-20_22:52:50_4.9_mi_E_of_Ojai_3.2.pdf
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August 20, 2023 | 263.39 KB | |
2222_2023-08-20_22:18:16_3.9_mi_SE_of_Ojai_3.8.pdf
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August 20, 2023 | 271.97 KB | |
2221_2023-08-20_21:47:29_2.6_mi_E_of_Ojai_2.1.pdf
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August 20, 2023 | 274.29 KB | |
2220_2023-08-20_21:45:26_3.7_mi_E_of_Ojai_3.6.pdf
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August 20, 2023 | 281.12 KB | |
2219_2023-08-20_21:41:01_4.1_mi_SE_of_Ojai_5.0.pdf
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August 20, 2023 | 321.65 KB | |
2218_2023-08-20_06:24:26_33.2_mi_SE_of_Mexicali_B.C._3.1.pdf
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August 20, 2023 | 229.60 KB | |
2217_2023-08-18_10:46:10_27.1_mi_SE_of_Mexicali_B.C._3.5.pdf
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August 18, 2023 | 233.67 KB | |
2216_2023-08-17_21:08:00_13.5_mi_SW_of_Rio_Dell_4.0.pdf
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August 17, 2023 | 226.82 KB | |
2214_2023-08-10_19:17:18_3.7_mi_NW_of_Parkfield_4.5.pdf
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August 10, 2023 | 295.64 KB | |
2213_2023-08-08_15:58:35_27.2_mi_SE_of_Mexicali_B.C._3.5.pdf
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August 08, 2023 | 238.73 KB | |
2212_2023-08-08_10:17:23_5.0_mi_N_of_Snoqualmie_4.0.pdf
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August 08, 2023 | 349.59 KB | |
2211_2023-08-08_08:47:38_28.6_mi_SE_of_Mexicali_B.C._3.4.pdf
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August 08, 2023 | 227.97 KB | |
2210_2023-08-06_18:57:01_36.3_mi_N_of_Ridgecrest_2.7.pdf
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August 06, 2023 | 246.33 KB | |
2209_2023-08-02_05:38:08_5.4_mi_NW_of_Calipatria_3.6.pdf
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August 02, 2023 | 278.61 KB | |
2208_2023-07-30_13:49:04_8.6_mi_N_of_Morgan_Hill_3.6.pdf
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July 30, 2023 | 305.88 KB | |
2207_2023-07-17_03:46:31_78.1_mi_S_of_Mexicali_B.C._3.9.pdf
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July 17, 2023 | 191.03 KB | |
2206_2023-07-17_01:56:21_24.3_mi_SW_of_Rio_Dell_2.3.pdf
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July 17, 2023 | 187.95 KB | |
2205_2023-07-16_19:37:19_99.0_mi_SE_of_Mexicali_B.C._4.3.pdf
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July 16, 2023 | 197.45 KB | |
2204_2023-07-16_19:16:03_96.6_mi_SE_of_Mexicali_B.C._4.5.pdf
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July 16, 2023 | 192.48 KB | |
2203_2023-07-16_10:37:12_77.6_mi_S_of_Mexicali_B.C._4.0.pdf
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July 16, 2023 | 193.53 KB | |
2202_2023-07-14_02:45:58_13.6_mi_NE_of_Healdsburg_3.4.pdf
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July 14, 2023 | 290.23 KB | |
2201_2023-07-13_01:42:53_67.2_mi_SW_of_Mexicali_B.C._4.1.pdf
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July 13, 2023 | 210.18 KB | |
2200_2023-07-09_05:30:39_12.1_mi_NE_of_Healdsburg_3.5.pdf
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July 09, 2023 | 272.22 KB | |
2199_2023-07-09_04:57:31_11.9_mi_NE_of_Healdsburg_3.1.pdf
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July 09, 2023 | 252.01 KB | |
2198_2023-07-04_14:58:49_15.9_mi_SW_of_Rio_Dell_3.9.pdf
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July 04, 2023 | 213.59 KB | |
2197_2023-07-03_17:57:01_61.8_mi_W_of_Fortuna_3.9.pdf
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July 03, 2023 | 158.53 KB | |
2196_2023-07-02_09:29:49_11.6_mi_S_of_Malibu_4.1.pdf
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July 02, 2023 | 246.93 KB | |
2195_2023-06-28_23:26:43_7.2_mi_NW_of_Calipatria_2.3.pdf
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June 28, 2023 | 252.97 KB | |
2194_2023-06-24_10:10:33_17.3_mi_E_of_Barstow_3.4.pdf
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June 24, 2023 | 251.18 KB | |
2193_2023-06-19_06:49:11_27.3_mi_N_of_California_City_3.5.pdf
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June 19, 2023 | 247.01 KB | |
2192_2023-06-18_03:44:59_7.6_mi_SE_of_Ukiah_4.2.pdf
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June 18, 2023 | 295.30 KB | |
2191_2023-06-16_23:19:57_3.4_mi_W_of_Malibu_2.6.pdf
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June 16, 2023 | 220.27 KB | |
2190_2023-06-15_18:03:48_23.6_mi_SW_of_Rio_Dell_3.4.pdf
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June 15, 2023 | 187.48 KB | |
2189_2023-06-13_22:45:43_15.0_mi_N_of_Greenfield_3.5.pdf
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June 13, 2023 | 269.56 KB |