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Post ShakeAlert Message Summaries


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.

FileDate PostedSize
1510_2019-11-10_220759__10_2_mi_N_of_Indio_3_5.pdf
November 10, 2019 331.82 KB
1509_2019-11-08_132939___4_0_mi_W_of_Ventura_3_6.pdf
November 08, 2019 290.47 KB
1508_2019-11-08_121012___3_6_mi_W_of_Ventura_3_5.pdf
November 08, 2019 287.55 KB
1507_2019-11-07_130539___3_8_mi_W_of_Ventura_3_4.pdf
November 07, 2019 288.96 KB
1506_2019-11-07_093152___7_7_mi_W_of_Calipatria_2_5.pdf
November 07, 2019 307.71 KB
1483_2019-10-01_131108___9_4_mi_NE_of_Ridgecrest_3_6.pdf
November 06, 2019 280.30 KB
1505_2019-11-03_203457__12_6_mi_NE_of_Healdsburg_3_9.pdf
November 03, 2019 308.90 KB
1504_2019-11-02_140550__12_2_mi_E_of_Cloverdale_3_6.pdf
November 02, 2019 309.21 KB
1503_2019-11-01_093317__59_5_mi_SE_of_Bishop_3_6.pdf
November 01, 2019 287.72 KB
1502_2019-10-29_162132__21_2_mi_E_of_Escondido_3_6.pdf
October 29, 2019 356.21 KB
1501_2019-10-29_152116__13_8_mi_NE_of_Gonzales_4_0.pdf
October 29, 2019 319.88 KB
1500_2019-10-29_093412__13_8_mi_NE_of_Gonzales_3_5.pdf
October 29, 2019 319.78 KB
1499_2019-10-29_010038___8_8_mi_E_of_Blue_Lake_3_4.pdf
October 29, 2019 288.04 KB
1498_2019-10-28_110110__72_9_mi_W_of_Brookings_4_4.pdf
October 28, 2019 148.39 KB
1497_2019-10-28_081043__13_0_mi_E_of_Cloverdale_3_3.pdf
October 28, 2019 307.20 KB
1475_2019-09-13_065021__15_0_mi_NE_of_Gonzales_4_0.pdf
October 23, 2019 314.72 KB
1479_2019-09-23_050235__34_3_mi_N_of_Ridgecrest_3_4.pdf
October 23, 2019 294.11 KB
1476_2019-09-14_094839__13_8_mi_SW_of_Huntington_Beach_3_5.pdf
October 23, 2019 313.04 KB
1480_2019-09-24_160813__34_1_mi_N_of_Ridgecrest_3_5.pdf
October 23, 2019 293.66 KB
1496_2019-10-22_213408__10_3_mi_W_of_Eureka_2_4.pdf
October 22, 2019 228.42 KB
1495_2019-10-21_101353__14_1_mi_E_of_Ridgecrest_3_4.pdf
October 21, 2019 271.81 KB
1494_2019-10-18_053454__11_8_mi_NE_of_Ridgecrest_3_8.pdf
October 18, 2019 277.71 KB
1493_2019-10-17_145455__13_8_mi_NE_of_Gonzales_3_7.pdf
October 17, 2019 301.56 KB
1492_2019-10-16_130913__13_6_mi_NE_of_Gonzales_3_4.pdf
October 16, 2019 316.49 KB
1491_2019-10-15_194230__13_7_mi_NE_of_Gonzales_5_0.pdf
October 15, 2019 328.64 KB
1490_2019-10-15_053342___0_7_mi_S_of_Pleasant_Hill_4_7.pdf
October 15, 2019 377.42 KB
1481_2019-09-30_150649__22_1_mi_SW_of_Rio_Dell_2_5.pdf
October 10, 2019 212.76 KB
1486_post_event_summary.pdf
October 10, 2019 271.36 KB
1489_2019-10-09_091516___9_3_mi_E_of_San_Jose_3_4.pdf
October 10, 2019 360.38 KB
1488_2019-10-06_231732__29_2_mi_SW_of_Rio_Dell_3_5.pdf
October 06, 2019 192.52 KB
1487_2019-10-05_154106___3_4_mi_SW_of_Daly_City_3_9.pdf
October 05, 2019 320.35 KB
1482_2019-10-01_000905__12_1_mi_NW_of_Fort_Bragg_3_5.pdf
October 04, 2019 220.08 KB
1485_post_event_summary.pdf
October 01, 2019 270.69 KB
1478_2019-09-19_095946__22_8_mi_NW_of_Calipatria_3_5.pdf
September 19, 2019 310.94 KB
1477_2019-09-16_181151__22_5_mi_NW_of_Calipatria_3_5.pdf
September 16, 2019 309.27 KB
1474_2019-09-10_202149___1_1_mi_E_of_Wildomar_3_9.pdf
September 10, 2019 366.28 KB
1186_2019-07-06_043515__46_1_mi_NE_of_California_City_3_2.pdf
September 09, 2019 244.13 KB
1473_2019-09-08_140723__45_0_mi_NE_of_California_City_3_5.pdf
September 08, 2019 268.56 KB
1472_2019-09-08_020502__64_9_mi_E_of_Porterville_3_6.pdf
September 08, 2019 296.93 KB
1471_2019-09-03_150501__16_6_mi_N_of_Point_Arena_3_4.pdf
September 03, 2019 263.91 KB
1470_2019-09-03_034129__45_7_mi_NE_of_California_City_3_5.pdf
September 03, 2019 280.53 KB
1469_post_event_summary.pdf
August 29, 2019 258.01 KB
1468_2019-08-28_022314__58_2_mi_E_of_Porterville_3_3.pdf
August 28, 2019 303.65 KB
1467_2019-08-27_155606__65_7_mi_E_of_Porterville_2_4.pdf
August 27, 2019 294.52 KB
1466_2019-08-25_081512__65_4_mi_E_of_Porterville_3_2.pdf
August 25, 2019 295.28 KB
1465_2019-08-23_141652__16_2_mi_SE_of_Clearlake_3_5.pdf
August 23, 2019 320.45 KB
1464_2019-08-23_053409__56_3_mi_N_of_California_City_4_0.pdf
August 23, 2019 288.08 KB
1463_2019-08-22_211059__56_2_mi_N_of_California_City_1_4.pdf
August 22, 2019 284.58 KB
1462_2019-08-22_204949__56_3_mi_N_of_California_City_4_5.pdf
August 22, 2019 300.54 KB
1461_2019-08-21_003010__46_8_mi_NE_of_California_City_3_4.pdf
August 22, 2019 278.78 KB