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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1530_2019-12-24_063359__12_2_mi_SW_of_Clearlake_3_3.pdf
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December 24, 2019 | 307.73 KB | |
1529_2019-12-21_082432__12_2_mi_E_of_Ridgecrest_4_0.pdf
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December 21, 2019 | 272.39 KB | |
1527_2019-12-17_182921___7_7_mi_SE_of_Parkfield_4_4.pdf
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December 21, 2019 | 320.08 KB | |
1528_2019-12-19_153013__20_2_mi_SW_of_Rio_Dell_3_9.pdf
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December 19, 2019 | 215.55 KB | |
1526_2019-12-17_065745___8_5_mi_NE_of_Ridgecrest_3_5.pdf
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December 17, 2019 | 278.32 KB | |
1525_2019-12-16_221558___8_7_mi_E_of_Ridgecrest_3_5.pdf
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December 16, 2019 | 276.98 KB | |
1524_2019-12-12_111340___9_1_mi_NE_of_Ridgecrest_3_5.pdf
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December 12, 2019 | 277.51 KB | |
1522_2019-12-10_220647__43_5_mi_W_of_Coronado_3_4.pdf
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December 11, 2019 | 195.07 KB | |
1523_2019-12-11_024820__76_1_mi_SE_of_Tijuana_B_C__4_2.pdf
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December 11, 2019 | 209.04 KB | |
1521_2019-12-05_085531___5_9_mi_NE_of_Ridgecrest_3_9.pdf
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December 05, 2019 | 283.67 KB | |
1520_2019-11-30_045826__27_6_mi_N_of_Gold_Beach_3_4.pdf
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November 30, 2019 | 214.75 KB | |
1519_2019-11-30_014511__27_9_mi_N_of_Gold_Beach_4_6.pdf
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November 30, 2019 | 229.78 KB | |
1518_2019-11-29_004942___8_5_mi_NE_of_Ridgecrest_3_7.pdf
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November 29, 2019 | 279.58 KB | |
1517_2019-11-28_231059__20_3_mi_N_of_Adelanto_3_6.pdf
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November 28, 2019 | 304.27 KB | |
1516_2019-11-26_000603__18_5_mi_E_of_Ridgecrest_3_5.pdf
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November 26, 2019 | 269.84 KB | |
1515_2019-11-15_222948__12_2_mi_E_of_Cloverdale_3_5.pdf
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November 21, 2019 | 305.78 KB | |
1514_2019-11-13_192653__14_9_mi_E_of_Ridgecrest_4_0.pdf
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November 15, 2019 | 269.75 KB | |
1513_2019-11-12_104401__17_7_mi_N_of_Point_Arena_3_2.pdf
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November 12, 2019 | 263.56 KB | |
1512_2019-11-12_021352___0_9_mi_E_of_El_Centro_4_0.pdf
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November 12, 2019 | 288.49 KB | |
1511_2019-11-12_020704___1_0_mi_E_of_El_Centro_3_0.pdf
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November 12, 2019 | 285.53 KB | |
1510_2019-11-10_220759__10_2_mi_N_of_Indio_3_5.pdf
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November 10, 2019 | 331.82 KB | |
1509_2019-11-08_132939___4_0_mi_W_of_Ventura_3_6.pdf
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November 08, 2019 | 290.47 KB | |
1508_2019-11-08_121012___3_6_mi_W_of_Ventura_3_5.pdf
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November 08, 2019 | 287.55 KB | |
1507_2019-11-07_130539___3_8_mi_W_of_Ventura_3_4.pdf
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November 07, 2019 | 288.96 KB | |
1506_2019-11-07_093152___7_7_mi_W_of_Calipatria_2_5.pdf
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November 07, 2019 | 307.71 KB | |
1483_2019-10-01_131108___9_4_mi_NE_of_Ridgecrest_3_6.pdf
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November 06, 2019 | 280.30 KB | |
1505_2019-11-03_203457__12_6_mi_NE_of_Healdsburg_3_9.pdf
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November 03, 2019 | 308.90 KB | |
1504_2019-11-02_140550__12_2_mi_E_of_Cloverdale_3_6.pdf
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November 02, 2019 | 309.21 KB | |
1503_2019-11-01_093317__59_5_mi_SE_of_Bishop_3_6.pdf
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November 01, 2019 | 287.72 KB | |
1502_2019-10-29_162132__21_2_mi_E_of_Escondido_3_6.pdf
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October 29, 2019 | 356.21 KB | |
1501_2019-10-29_152116__13_8_mi_NE_of_Gonzales_4_0.pdf
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October 29, 2019 | 319.88 KB | |
1500_2019-10-29_093412__13_8_mi_NE_of_Gonzales_3_5.pdf
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October 29, 2019 | 319.78 KB | |
1499_2019-10-29_010038___8_8_mi_E_of_Blue_Lake_3_4.pdf
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October 29, 2019 | 288.04 KB | |
1498_2019-10-28_110110__72_9_mi_W_of_Brookings_4_4.pdf
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October 28, 2019 | 148.39 KB | |
1497_2019-10-28_081043__13_0_mi_E_of_Cloverdale_3_3.pdf
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October 28, 2019 | 307.20 KB | |
1475_2019-09-13_065021__15_0_mi_NE_of_Gonzales_4_0.pdf
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October 23, 2019 | 314.72 KB | |
1479_2019-09-23_050235__34_3_mi_N_of_Ridgecrest_3_4.pdf
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October 23, 2019 | 294.11 KB | |
1476_2019-09-14_094839__13_8_mi_SW_of_Huntington_Beach_3_5.pdf
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October 23, 2019 | 313.04 KB | |
1480_2019-09-24_160813__34_1_mi_N_of_Ridgecrest_3_5.pdf
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October 23, 2019 | 293.66 KB | |
1496_2019-10-22_213408__10_3_mi_W_of_Eureka_2_4.pdf
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October 22, 2019 | 228.42 KB | |
1495_2019-10-21_101353__14_1_mi_E_of_Ridgecrest_3_4.pdf
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October 21, 2019 | 271.81 KB | |
1494_2019-10-18_053454__11_8_mi_NE_of_Ridgecrest_3_8.pdf
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October 18, 2019 | 277.71 KB | |
1493_2019-10-17_145455__13_8_mi_NE_of_Gonzales_3_7.pdf
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October 17, 2019 | 301.56 KB | |
1492_2019-10-16_130913__13_6_mi_NE_of_Gonzales_3_4.pdf
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October 16, 2019 | 316.49 KB | |
1491_2019-10-15_194230__13_7_mi_NE_of_Gonzales_5_0.pdf
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October 15, 2019 | 328.64 KB | |
1490_2019-10-15_053342___0_7_mi_S_of_Pleasant_Hill_4_7.pdf
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October 15, 2019 | 377.42 KB | |
1481_2019-09-30_150649__22_1_mi_SW_of_Rio_Dell_2_5.pdf
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October 10, 2019 | 212.76 KB | |
1486_post_event_summary.pdf
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October 10, 2019 | 271.36 KB | |
1489_2019-10-09_091516___9_3_mi_E_of_San_Jose_3_4.pdf
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October 10, 2019 | 360.38 KB | |
1488_2019-10-06_231732__29_2_mi_SW_of_Rio_Dell_3_5.pdf
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October 06, 2019 | 192.52 KB |