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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1581_2020-04-04_020500__15_6_mi_SW_of_La_Quinta_3_6.pdf
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April 04, 2020 | 358.14 KB | |
1580_2020-04-04_015532__14_8_mi_SW_of_La_Quinta_2_9.pdf
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April 04, 2020 | 357.18 KB | |
1579_2020-04-04_015422__15_3_mi_SW_of_La_Quinta_3_6.pdf
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April 04, 2020 | 358.26 KB | |
1578_2020-04-04_015318__15_4_mi_SW_of_La_Quinta_4_6.pdf
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April 04, 2020 | 360.38 KB | |
1577_2020-03-25_115737__13_6_mi_E_of_Cloverdale_3_8.pdf
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March 25, 2020 | 316.94 KB | |
1576_2020-03-23_100755__31_5_mi_SW_of_Rio_Dell_3_7.pdf
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March 23, 2020 | 188.75 KB | |
1575_2020-03-23_055357__29_0_mi_NE_of_Ridgecrest_4_1.pdf
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March 23, 2020 | 277.80 KB | |
1574_2020-03-22_162738__37_0_mi_W_of_Fortuna_4_7.pdf
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March 22, 2020 | 190.75 KB | |
1573_post_event_summary.pdf
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March 21, 2020 | 200.29 KB | |
1572_2020-03-20_115254___8_8_mi_E_of_Ridgecrest_3_5.pdf
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March 20, 2020 | 278.02 KB | |
1571_2020-03-18_220821__20_6_mi_SW_of_Rio_Dell_5_0.pdf
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March 18, 2020 | 230.08 KB | |
1570_2020-03-14_222858__16_5_mi_N_of_Willits_3_3.pdf
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March 14, 2020 | 290.25 KB | |
1569_2020-03-11_011716__14_2_mi_S_of_Loyalton_3_8.pdf
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March 11, 2020 | 318.23 KB | |
1568_2020-03-08_061600__11_2_mi_E_of_Cloverdale_3_0.pdf
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March 08, 2020 | 312.37 KB | |
1567_2020-03-08_003331__35_4_mi_N_of_Ridgecrest_3_7.pdf
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March 08, 2020 | 299.69 KB | |
1566_2020-03-07_125116__35_5_mi_N_of_Ridgecrest_3_5.pdf
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March 07, 2020 | 298.40 KB | |
1565_2020-03-07_084913__35_2_mi_N_of_Ridgecrest_3_4.pdf
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March 07, 2020 | 298.71 KB | |
1564_2020-03-07_035213__31_3_mi_SE_of_Mexicali_B_C__5_5.pdf
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March 07, 2020 | 260.95 KB | |
1563_2020-03-03_182132___7_7_mi_N_of_Ukiah_3_6.pdf
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March 03, 2020 | 296.77 KB | |
1562_2020-03-03_150101__22_0_mi_SW_of_Mendota_4_0.pdf
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March 03, 2020 | 304.15 KB | |
1561_2020-03-03_025418__40_7_mi_SE_of_Mexicali_B_C__3_2.pdf
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March 03, 2020 | 281.53 KB | |
1560_2020-02-27_232729__11_5_mi_E_of_Cloverdale_3_5.pdf
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February 27, 2020 | 311.49 KB | |
1559_2020-02-26_183402__12_2_mi_SW_of_Clearlake_1_2.pdf
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February 26, 2020 | 308.58 KB | |
1558_2020-02-26_092115__26_8_mi_SW_of_Rio_Dell_2_8.pdf
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February 26, 2020 | 202.29 KB | |
1557_2020-02-22_191427__33_1_mi_SW_of_Rio_Dell_4_2.pdf
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February 22, 2020 | 188.51 KB | |
1556_2020-02-21_134253___9_6_mi_NW_of_Santa_Clarita_3_7.pdf
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February 21, 2020 | 346.68 KB | |
1555_2020-02-18_182056__13_5_mi_SW_of_Clearlake_2_7.pdf
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February 18, 2020 | 316.51 KB | |
1554_2020-02-13_033342__13_0_mi_SE_of_Hollister_3_8.pdf
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February 13, 2020 | 321.39 KB | |
1553_2020-02-08_193420__14_1_mi_N_of_Barstow_4_0.pdf
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February 08, 2020 | 285.99 KB | |
1552_2020-02-07_104552__22_9_mi_W_of_Fortuna_2_9.pdf
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February 07, 2020 | 198.86 KB | |
1551_2020-02-06_110529__20_0_mi_SW_of_Rio_Dell_3_3.pdf
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February 06, 2020 | 225.37 KB | |
1550_2020-02-06_100008__20_2_mi_SW_of_Rio_Dell_2_5.pdf
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February 06, 2020 | 223.57 KB | |
1549_2020-02-06_082024__19_7_mi_SW_of_Rio_Dell_3_7.pdf
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February 06, 2020 | 222.55 KB | |
1548_2020-02-04_130332___7_0_mi_W_of_Calipatria_2_9.pdf
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February 04, 2020 | 307.15 KB | |
1547_2020-02-03_103957__30_6_mi_SW_of_Fortuna_3_3.pdf
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February 03, 2020 | 179.29 KB | |
1546_2020-02-02_005950__14_7_mi_SE_of_Hemet_3_7.pdf
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February 02, 2020 | 367.12 KB | |
1545_2020-02-01_183654___9_4_mi_E_of_Mammoth_Lakes_4_7.pdf
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February 01, 2020 | 335.77 KB | |
1544_2020-01-31_074537__21_6_mi_SE_of_Mexicali_B_C__3_1.pdf
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January 31, 2020 | 281.98 KB | |
1543_2020-01-29_123050___8_2_mi_N_of_Ukiah_3_5.pdf
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January 29, 2020 | 298.60 KB | |
1542_2020-01-25_030335__14_2_mi_N_of_Barstow_4_5.pdf
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January 25, 2020 | 297.08 KB | |
1541_2020-01-24_213533__48_0_mi_S_of_Port_Alberni_4_5.pdf
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January 24, 2020 | 232.02 KB | |
1540_2020-01-22_085256__20_1_mi_SE_of_Mexicali_B_C__3_4.pdf
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January 22, 2020 | 283.77 KB | |
1539_2020-01-22_074110___3_1_mi_NW_of_San_Fernando_3_6.pdf
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January 22, 2020 | 336.86 KB | |
1538_2020-01-12_052103__21_8_mi_SE_of_Mexicali_B_C__4_0.pdf
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January 12, 2020 | 295.44 KB | |
1537_2020-01-02_101300__17_7_mi_S_of_Port_Hueneme_3_7.pdf
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January 02, 2020 | 273.10 KB | |
1536_2020-01-02_071631___5_8_mi_NE_of_Morgan_Hill_4_1.pdf
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January 02, 2020 | 350.85 KB | |
1534_2019-12-26_194823___9_3_mi_SE_of_Mammoth_Lakes_4_0.pdf
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December 26, 2019 | 305.95 KB | |
1533_2019-12-26_041200__28_6_mi_NE_of_Ridgecrest_3_2.pdf
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December 26, 2019 | 270.91 KB | |
1532_2019-12-25_231506__46_7_mi_SW_of_Avalon_3_4.pdf
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December 25, 2019 | 181.03 KB | |
1531_2019-12-25_230727__35_2_mi_N_of_Ridgecrest_2_5.pdf
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December 25, 2019 | 296.55 KB |