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 | |
---|---|---|---|
1681_2020-09-29_155007_21_1_mi_SW_of_Rio_Dell_2_6.pdf
|
September 29, 2020 | 218.72 KB | |
1680_2020-09-28_051636_6_2_mi_NE_of_Milpitas_3_4.pdf
|
September 28, 2020 | 382.07 KB | |
1679_2020-09-25_171011_6_3_mi_E_of_Desert_Hot_Springs_3_6.pdf
|
September 25, 2020 | 338.17 KB | |
1678_2020-09-24_144227_13_4_mi_NE_of_Healdsburg_3_1.pdf
|
September 24, 2020 | 321.52 KB | |
1677_2020-09-24_101115_12_9_mi_E_of_Cloverdale_2_9.pdf
|
September 24, 2020 | 320.41 KB | |
1676_2020-09-19_063846_2_0_mi_W_of_South_El_Monte_4_6.pdf
|
September 19, 2020 | 366.00 KB | |
1675_2020-09-17_183625_13_2_mi_SW_of_Clearlake_2_9.pdf
|
September 17, 2020 | 322.59 KB | |
1674_2020-09-14_153659_31_1_mi_N_of_Willits_3_4.pdf
|
September 14, 2020 | 320.06 KB | |
1673_2020-09-11_081410_58_8_mi_N_of_Ridgecrest_3_5.pdf
|
September 11, 2020 | 294.03 KB | |
1672_2020-09-11_075545_59_3_mi_N_of_Ridgecrest_4_0.pdf
|
September 11, 2020 | 296.74 KB | |
1671_2020-09-10_040057_6_6_mi_SE_of_Willits_2_7.pdf
|
September 10, 2020 | 311.38 KB | |
1670_2020-09-06_014836_5_0_mi_E_of_Solvang_3_8.pdf
|
September 06, 2020 | 302.99 KB | |
1659_2020-08-17_153033_77_9_mi_S_of_Mexicali_B_C__5_1.pdf
|
September 04, 2020 | 187.85 KB | |
1669_2020-09-02_161831_29_4_mi_N_of_Ridgecrest_3_6.pdf
|
September 02, 2020 | 292.24 KB | |
1668_2020-08-29_080606_29_0_mi_N_of_Ridgecrest_3_0.pdf
|
August 29, 2020 | 291.86 KB | |
1667_2020-08-28_112603_13_2_mi_SW_of_Calexico_3_5.pdf
|
August 28, 2020 | 278.24 KB | |
1666_2020-08-27_084831_6_7_mi_SE_of_Willits_3_5.pdf
|
August 27, 2020 | 309.06 KB | |
1665_2020-08-21_082008_12_0_mi_E_of_Ridgecrest_3_7.pdf
|
August 21, 2020 | 273.05 KB | |
1664_2020-08-19_173211_51_3_mi_SW_of_Beatty_4_3.pdf
|
August 19, 2020 | 306.47 KB | |
1663_2020-08-19_015933_6_3_mi_SE_of_Willits_3_8.pdf
|
August 19, 2020 | 312.22 KB | |
1662_2020-08-19_014342_6_6_mi_SE_of_Willits_3_5.pdf
|
August 19, 2020 | 310.86 KB | |
1661_2020-08-19_005523_6_8_mi_SE_of_Willits_4_0.pdf
|
August 19, 2020 | 313.16 KB | |
1660_2020-08-19_004616_6_5_mi_SE_of_Willits_3_1.pdf
|
August 19, 2020 | 311.38 KB | |
1658_2020-08-17_150906_80_8_mi_S_of_Mexicali_B_C__4_4.pdf
|
August 17, 2020 | 247.67 KB | |
1657_2020-08-12_114543_13_6_mi_NE_of_Healdsburg_4_0.pdf
|
August 12, 2020 | 325.08 KB | |
1656_2020-08-11_111958_12_9_mi_NW_of_Calipatria_3_2.pdf
|
August 11, 2020 | 310.87 KB | |
1655_2020-08-10_192929_13_7_mi_NW_of_Calipatria_3_6.pdf
|
August 10, 2020 | 308.29 KB | |
1654_2020-08-10_185321_14_2_mi_NW_of_Calipatria_3_2.pdf
|
August 10, 2020 | 307.39 KB | |
1653_2020-08-10_161354_18_1_mi_NW_of_Calipatria_2_4.pdf
|
August 10, 2020 | 305.60 KB | |
1652_2020-08-10_160339_13_0_mi_NW_of_Calipatria_3_5.pdf
|
August 10, 2020 | 307.33 KB | |
1651_2020-08-10_155615_12_8_mi_NW_of_Calipatria_4_0.pdf
|
August 10, 2020 | 323.06 KB | |
1650_2020-08-10_155548_13_5_mi_NW_of_Calipatria_3_5.pdf
|
August 10, 2020 | 312.29 KB | |
1649_2020-08-09_032355_30_6_mi_SW_of_Rio_Dell_3_7.pdf
|
August 09, 2020 | 198.63 KB | |
1648_2020-08-09_000035_32_2_mi_SW_of_Rio_Dell_3_7.pdf
|
August 09, 2020 | 194.25 KB | |
1647_2020-07-30_134819_0_8_mi_N_of_San_Fernando_3_9.pdf
|
July 30, 2020 | 345.26 KB | |
1646_2020-07-30_112929_1_4_mi_N_of_San_Fernando_4_2.pdf
|
July 30, 2020 | 348.61 KB | |
1645_2020-07-30_032301_20_3_mi_E_of_King_City_4_1.pdf
|
July 30, 2020 | 312.16 KB | |
1644_2020-07-24_070513_59_1_mi_N_of_Ridgecrest_3_6.pdf
|
July 24, 2020 | 293.13 KB | |
1643_2020-07-23_002926_59_5_mi_N_of_Ridgecrest_3_6.pdf
|
July 23, 2020 | 293.89 KB | |
1642_2020-07-22_045709_12_9_mi_SE_of_Hollister_3_5.pdf
|
July 22, 2020 | 337.18 KB | |
1641_2020-07-20_220153_21_4_mi_SW_of_Arvin_3_5.pdf
|
July 20, 2020 | 335.51 KB | |
1640_2020-07-05_161407_13_5_mi_NE_of_Healdsburg_3_9.pdf
|
July 05, 2020 | 321.87 KB | |
1639_2020-07-05_121701_37_2_mi_W_of_Westmorland_3_5.pdf
|
July 05, 2020 | 314.08 KB | |
1638_2020-06-29_015549_61_5_mi_N_of_Ridgecrest_3_5.pdf
|
June 29, 2020 | 292.65 KB | |
1637_2020-06-28_221358_12_8_mi_NW_of_Calipatria_3_2.pdf
|
June 28, 2020 | 308.22 KB | |
1636_post_event_summary.pdf
|
June 25, 2020 | 109.77 KB | |
1635_2020-06-25_040907_13_2_mi_NE_of_Healdsburg_3_4.pdf
|
June 25, 2020 | 321.00 KB | |
1634_2020-06-24_211248_61_5_mi_N_of_Ridgecrest_3_7.pdf
|
June 24, 2020 | 292.71 KB | |
1633_2020-06-24_182038_61_6_mi_N_of_Ridgecrest_3_7.pdf
|
June 24, 2020 | 292.32 KB | |
1632_2020-06-24_175919_59_4_mi_N_of_Ridgecrest_4_4.pdf
|
June 24, 2020 | 323.94 KB |