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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1780_2021-04-25_045928_9_5_mi_N_of_Morgan_Hill_3_8.pdf
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April 25, 2021 | 366.90 KB | |
1779_2021-04-23_111840_18_9_mi_NE_of_Willits_3_7.pdf
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April 23, 2021 | 314.73 KB | |
1778_2021-04-22_070010_12_5_mi_SE_of_Mammoth_Lakes_3_1.pdf
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April 22, 2021 | 323.54 KB | |
1777_2021-04-20_094834_34_3_mi_SE_of_Rio_Dell_3_8.pdf
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April 20, 2021 | 300.43 KB | |
1776_2021-04-19_185058_12_7_mi_NE_of_Healdsburg_4_1.pdf
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April 19, 2021 | 329.01 KB | |
1775_2021-04-10_132206_4_4_mi_SW_of_Holtville_3_5.pdf
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April 10, 2021 | 290.77 KB | |
1774_2021-04-08_205115_7_2_mi_E_of_Ridgecrest_3_6.pdf
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April 08, 2021 | 273.43 KB | |
1773_2021-04-08_035208_3_7_mi_SW_of_Holtville_3_7.pdf
|
April 08, 2021 | 281.63 KB | |
1772_2021-04-05_202721_30_9_mi_SW_of_Rio_Dell_3_5.pdf
|
April 05, 2021 | 186.66 KB | |
1771_2021-04-05_114401_1_4_mi_SE_of_Inglewood_4_1.pdf
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April 05, 2021 | 336.32 KB | |
1770_2021-04-02_082135_29_3_mi_SW_of_Rio_Dell_4_4.pdf
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April 02, 2021 | 201.42 KB | |
1770_2021-04-02_082135_29_3_mi_SW_of_Rio_Dell_4_1.pdf
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April 02, 2021 | 201.76 KB | |
1769_2021-03-31_085625_22_8_mi_SE_of_Mexicali_B_C__4_2.pdf
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March 31, 2021 | 285.27 KB | |
1768_2021-03-30_170534_12_2_mi_SW_of_Clearlake_3_3.pdf
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March 30, 2021 | 322.33 KB | |
1767_2021-03-30_155120_63_3_mi_W_of_Fortuna_4_3.pdf
|
March 30, 2021 | 114.50 KB | |
1766_2021-03-24_154114_13_0_mi_SW_of_Willits_3_8.pdf
|
March 24, 2021 | 283.55 KB | |
1765_post_event_summary.pdf
|
March 23, 2021 | 122.77 KB | |
1764_2021-03-17_142158_62_6_mi_W_of_Trinidad_3_6.pdf
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March 17, 2021 | 121.41 KB | |
1763_2021-03-05_183311_19_9_mi_N_of_Ridgecrest_3_3.pdf
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March 05, 2021 | 279.83 KB | |
1762_2021-03-04_170832_27_6_mi_SW_of_Rio_Dell_2_9.pdf
|
March 05, 2021 | 202.38 KB | |
1761_2021-02-28_084538_32_0_mi_SW_of_King_City_3_8.pdf
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February 28, 2021 | 262.96 KB | |
1760_2021-02-25_193019_10_6_mi_E_of_Cloverdale_3_5.pdf
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February 25, 2021 | 320.61 KB | |
1759_post_event_summary.pdf
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February 23, 2021 | 211.30 KB | |
1758_2021-02-22_013813_5_5_mi_NE_of_Gilroy_3_9.pdf
|
February 22, 2021 | 357.38 KB | |
1757_2021-02-14_234234_31_1_mi_NE_of_Ridgecrest_3_5.pdf
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February 14, 2021 | 263.17 KB | |
1756_2021-02-12_235713_43_4_mi_N_of_Ridgecrest_4_0.pdf
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February 13, 2021 | 299.89 KB | |
1755_2021-02-10_012709_6_8_mi_NW_of_Calipatria_3_8.pdf
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February 10, 2021 | 304.64 KB | |
1754_2021-02-10_012432_6_6_mi_NW_of_Calipatria_2_9.pdf
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February 10, 2021 | 303.06 KB | |
1753_2021-02-08_080012_15_8_mi_W_of_El_Centro_3_5.pdf
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February 08, 2021 | 285.93 KB | |
1752_2021-02-07_185750_31_2_mi_NE_of_Ridgecrest_3_3.pdf
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February 07, 2021 | 262.91 KB | |
1751_post_event_summary.pdf
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February 05, 2021 | 152.94 KB | |
1750_2021-02-03_092336_15_4_mi_W_of_El_Centro_3_8.pdf
|
February 03, 2021 | 289.05 KB | |
1736_2020-12-28_152925_27_0_mi_SE_of_Mexicali_B_C__2_5.pdf
|
February 03, 2021 | 268.92 KB | |
1749_2021-01-25_081618_6_8_mi_NW_of_Calipatria_2_5.pdf
|
January 25, 2021 | 301.70 KB | |
1748_2021-01-21_012224_27_3_mi_NW_of_Ridgecrest_3_6.pdf
|
January 21, 2021 | 294.83 KB | |
1747_2021-01-17_040127_4_3_mi_W_of_San_Juan_Bautista_4_5.pdf
|
January 17, 2021 | 343.46 KB | |
1746_2021-01-17_031449_45_7_mi_NW_of_Ridgecrest_3_8.pdf
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January 17, 2021 | 308.23 KB | |
1745_2021-01-17_024908_45_7_mi_NW_of_Ridgecrest_3_9.pdf
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January 17, 2021 | 305.63 KB | |
1744_2021-01-14_191810_0_3_mi_W_of_Corcoran_3_8.pdf
|
January 14, 2021 | 383.48 KB | |
1743_2021-01-10_070148_6_5_mi_NW_of_Calipatria_2_9.pdf
|
January 10, 2021 | 304.29 KB | |
1742_2021-01-05_010726_26_4_mi_SW_of_Rio_Dell_2_7.pdf
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January 05, 2021 | 201.11 KB | |
1741_2021-01-03_052156_0_6_mi_N_of_Gonzales_3_3.pdf
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January 03, 2021 | 327.91 KB | |
1740_2021-01-02_144223_14_6_mi_NE_of_Gonzales_4_5.pdf
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January 02, 2021 | 340.32 KB | |
1739_2020-12-31_134158_7_1_mi_SW_of_Sausalito_3_6.pdf
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December 31, 2020 | 327.71 KB | |
1738_2020-12-31_042203_10_7_mi_E_of_Cloverdale_3_6.pdf
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December 31, 2020 | 321.31 KB | |
1737_post_event_summary.pdf
|
December 28, 2020 | 202.39 KB | |
1735_2020-12-28_143452_29_2_mi_SE_of_Mexicali_B_C__3_6.pdf
|
December 28, 2020 | 271.67 KB | |
1734_2020-12-27_190547_2_2_mi_W_of_San_Juan_Bautista_3_2.pdf
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December 27, 2020 | 340.85 KB | |
1733_2020-12-27_144440_9_8_mi_E_of_Willows_3_9.pdf
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December 27, 2020 | 324.16 KB | |
1732_2020-12-25_202559_15_3_mi_E_of_Coachella_3_6.pdf
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December 25, 2020 | 316.18 KB |