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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1731_2020-12-23_222219_22_7_mi_S_of_Mexicali_B_C__3_3.pdf
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December 23, 2020 | 258.98 KB | |
1730_2020-12-22_003000_20_6_mi_S_of_Mexicali_B_C__4_0.pdf
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December 22, 2020 | 282.53 KB | |
1729_2020-12-18_161342_7_0_mi_SW_of_Rio_Dell_3_8.pdf
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December 18, 2020 | 250.17 KB | |
1727_2020-12-15_145840_6_1_mi_NE_of_Morgan_Hill_3_7.pdf
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December 15, 2020 | 359.69 KB | |
1728_2020-12-15_145941_5_9_mi_E_of_Morgan_Hill_3_6.pdf
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December 15, 2020 | 364.45 KB | |
1726_2020-12-11_072434_5_8_mi_SE_of_Willits_3_4.pdf
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December 11, 2020 | 308.49 KB | |
1725_2020-12-08_195055_25_5_mi_SW_of_Rio_Dell_2_9.pdf
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December 08, 2020 | 203.57 KB | |
1724_2020-12-06_151753_25_5_mi_E_of_Escondido_3_8.pdf
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December 06, 2020 | 356.06 KB | |
1723_2020-12-06_150333_8_1_mi_W_of_Lakeport_4_3.pdf
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December 06, 2020 | 315.48 KB | |
1722_2020-12-05_054129_14_2_mi_E_of_Temecula_3_7.pdf
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December 05, 2020 | 363.58 KB | |
1721_2020-12-04_104838_11_8_mi_E_of_Cloverdale_2_2.pdf
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December 04, 2020 | 318.80 KB | |
1720_2020-12-04_104506_11_3_mi_E_of_Cloverdale_3_5.pdf
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December 04, 2020 | 321.53 KB | |
1715_2020-11-22_031159_41_6_mi_W_of_Eureka_2_4.pdf
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December 02, 2020 | 158.87 KB | |
1719_post_event_summary.pdf
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December 02, 2020 | 321.72 KB | |
1718_2020-12-01_010620_9_8_mi_W_of_Ukiah_3_3.pdf
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December 01, 2020 | 283.44 KB | |
1717_post_event_summary.pdf
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November 30, 2020 | 345.82 KB | |
1716_2020-11-26_225957_6_6_mi_NW_of_Calipatria_3_6.pdf
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November 26, 2020 | 305.33 KB | |
1714_2020-11-20_195037_12_9_mi_SW_of_Clearlake_3_2.pdf
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November 20, 2020 | 325.26 KB | |
1713_2020-11-16_105622_18_7_mi_N_of_Ridgecrest_3_7.pdf
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November 16, 2020 | 282.42 KB | |
1712_2020-11-14_055013_31_5_mi_W_of_Fortuna_3_5.pdf
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November 14, 2020 | 183.44 KB | |
1711_2020-11-13_055653_7_1_mi_W_of_Calipatria_2_7.pdf
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November 13, 2020 | 305.82 KB | |
1710_2020-11-02_222214_6_8_mi_SE_of_Willits_3_2.pdf
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November 02, 2020 | 310.17 KB | |
1709_2020-11-02_192515_20_3_mi_SW_of_Rio_Dell_3_0.pdf
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November 02, 2020 | 229.01 KB | |
1708_2020-10-22_205926_6_5_mi_NW_of_Calipatria_3_5.pdf
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October 22, 2020 | 320.87 KB | |
1707_2020-10-20_015946_6_2_mi_SE_of_Willits_3_5.pdf
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October 20, 2020 | 310.41 KB | |
1706_2020-10-20_015850_6_5_mi_SE_of_Willits_3_8.pdf
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October 20, 2020 | 314.11 KB | |
1705_2020-10-18_190416_22_1_mi_SE_of_Mexicali_B_C__3_3.pdf
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October 18, 2020 | 271.70 KB | |
1704_2020-10-18_103134_22_3_mi_SE_of_Mexicali_B_C__3_7.pdf
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October 18, 2020 | 271.23 KB | |
1703_2020-10-14_214240_26_9_mi_SW_of_Greenfield_3_5.pdf
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October 14, 2020 | 271.91 KB | |
1702_2020-10-10_012411_20_8_mi_E_of_Rio_Dell_3_7.pdf
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October 10, 2020 | 301.09 KB | |
1701_2020-10-08_224409_40_1_mi_SE_of_Mexicali_B_C__3_0.pdf
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October 08, 2020 | 257.66 KB | |
1700_2020-10-07_172944_6_2_mi_SE_of_Willits_3_2.pdf
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October 07, 2020 | 310.16 KB | |
1699_2020-10-07_045643_13_3_mi_W_of_Eureka_3_2.pdf
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October 07, 2020 | 226.61 KB | |
1698_2020-10-07_014404_9_0_mi_NE_of_Big_Bear_Lake_3_6.pdf
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October 07, 2020 | 331.34 KB | |
1697_2020-10-04_052252_6_5_mi_SE_of_Willits_2_8.pdf
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October 04, 2020 | 307.46 KB | |
1696_2020-10-04_044917_6_2_mi_SE_of_Willits_3_5.pdf
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October 04, 2020 | 310.05 KB | |
1695_2020-10-02_021044_3_2_mi_NE_of_Westmorland_2_6.pdf
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October 02, 2020 | 299.60 KB | |
1694_2020-10-01_224731_2_8_mi_NE_of_Westmorland_3_5.pdf
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October 01, 2020 | 298.56 KB | |
1688_2020-10-01_005813_2_5_mi_NE_of_Westmorland_4_1.pdf
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October 01, 2020 | 304.37 KB | |
1693_2020-10-01_144642_3_1_mi_NE_of_Westmorland_3_6.pdf
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October 01, 2020 | 297.90 KB | |
1692_2020-10-01_125441_2_9_mi_NE_of_Westmorland_2_7.pdf
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October 01, 2020 | 301.29 KB | |
1691_2020-10-01_034016_2_7_mi_N_of_Westmorland_3_5.pdf
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October 01, 2020 | 301.11 KB | |
1690_2020-10-01_033634_2_5_mi_NE_of_Westmorland_4_0.pdf
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October 01, 2020 | 306.73 KB | |
1689_2020-10-01_033059_1_5_mi_SW_of_Calipatria_3_5.pdf
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October 01, 2020 | 297.26 KB | |
1687_2020-10-01_004118_2_7_mi_NE_of_Westmorland_3_8.pdf
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October 01, 2020 | 303.74 KB | |
1686_2020-10-01_003127_2_2_mi_NE_of_Westmorland_4_6.pdf
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October 01, 2020 | 303.63 KB | |
1685_2020-09-30_235802_2_7_mi_E_of_Westmorland_3_5.pdf
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October 01, 2020 | 302.00 KB | |
1684_2020-09-30_233152_2_1_mi_NE_of_Westmorland_3_9.pdf
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September 30, 2020 | 303.33 KB | |
1683_2020-09-30_230602_1_9_mi_E_of_Westmorland_3_5.pdf
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September 30, 2020 | 300.50 KB | |
1682_2020-09-29_160230_6_2_mi_NE_of_Milpitas_3_3.pdf
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September 29, 2020 | 382.57 KB |