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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1487_2019-10-05_154106___3_4_mi_SW_of_Daly_City_3_9.pdf
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October 05, 2019 | 320.35 KB | |
1482_2019-10-01_000905__12_1_mi_NW_of_Fort_Bragg_3_5.pdf
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October 04, 2019 | 220.08 KB | |
1485_post_event_summary.pdf
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October 01, 2019 | 270.69 KB | |
1478_2019-09-19_095946__22_8_mi_NW_of_Calipatria_3_5.pdf
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September 19, 2019 | 310.94 KB | |
1477_2019-09-16_181151__22_5_mi_NW_of_Calipatria_3_5.pdf
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September 16, 2019 | 309.27 KB | |
1474_2019-09-10_202149___1_1_mi_E_of_Wildomar_3_9.pdf
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September 10, 2019 | 366.28 KB | |
1186_2019-07-06_043515__46_1_mi_NE_of_California_City_3_2.pdf
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September 09, 2019 | 244.13 KB | |
1473_2019-09-08_140723__45_0_mi_NE_of_California_City_3_5.pdf
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September 08, 2019 | 268.56 KB | |
1472_2019-09-08_020502__64_9_mi_E_of_Porterville_3_6.pdf
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September 08, 2019 | 296.93 KB | |
1471_2019-09-03_150501__16_6_mi_N_of_Point_Arena_3_4.pdf
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September 03, 2019 | 263.91 KB | |
1470_2019-09-03_034129__45_7_mi_NE_of_California_City_3_5.pdf
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September 03, 2019 | 280.53 KB | |
1469_post_event_summary.pdf
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August 29, 2019 | 258.01 KB | |
1468_2019-08-28_022314__58_2_mi_E_of_Porterville_3_3.pdf
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August 28, 2019 | 303.65 KB | |
1467_2019-08-27_155606__65_7_mi_E_of_Porterville_2_4.pdf
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August 27, 2019 | 294.52 KB | |
1466_2019-08-25_081512__65_4_mi_E_of_Porterville_3_2.pdf
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August 25, 2019 | 295.28 KB | |
1465_2019-08-23_141652__16_2_mi_SE_of_Clearlake_3_5.pdf
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August 23, 2019 | 320.45 KB | |
1464_2019-08-23_053409__56_3_mi_N_of_California_City_4_0.pdf
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August 23, 2019 | 288.08 KB | |
1463_2019-08-22_211059__56_2_mi_N_of_California_City_1_4.pdf
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August 22, 2019 | 284.58 KB | |
1462_2019-08-22_204949__56_3_mi_N_of_California_City_4_5.pdf
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August 22, 2019 | 300.54 KB | |
1461_2019-08-21_003010__46_8_mi_NE_of_California_City_3_4.pdf
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August 22, 2019 | 278.78 KB | |
1460_2019-08-19_000912__47_6_mi_NE_of_California_City_3_6.pdf
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August 19, 2019 | 270.38 KB | |
1459_2019-08-15_115024__64_5_mi_E_of_Porterville_3_6.pdf
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August 16, 2019 | 295.44 KB | |
1458_2019-08-14_225226_53_miles_N_of_Ridgecrest_3_49.pdf
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August 14, 2019 | 293.61 KB | |
1457_2019-08-14_210411_30_miles_N_of_Ridgecrest_3_56.pdf
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August 14, 2019 | 286.86 KB | |
1456_2019-08-14_093419_30_miles_N_of_Ridgecrest_3_55.pdf
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August 14, 2019 | 286.20 KB | |
1455_2019-08-10_190235_62_miles_N_of_Ridgecrest_2_72.pdf
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August 10, 2019 | 300.03 KB | |
1454_2019-08-03_185358_52_miles_SW_of_Ferndale_2_77.pdf
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August 03, 2019 | 152.43 KB | |
1453_2019-08-02_121842_18_miles_N_of_Ridgecrest_3_55.pdf
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August 02, 2019 | 281.87 KB | |
1447_2019-07-27_013537_29_miles_E_of_Ridgecrest_3_39.pdf
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August 01, 2019 | 268.59 KB | |
1452_2019-07-30_163056_15_miles_E_of_Ridgecrest_3_56.pdf
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July 30, 2019 | 271.93 KB | |
1451_2019-07-29_231914_22_miles_N_of_Ridgecrest_3_5.pdf
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July 29, 2019 | 283.17 KB | |
1450_2019-07-27_222220_52_miles_N_of_Ridgecrest_2_16.pdf
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July 27, 2019 | 286.02 KB | |
1449_2019-07-27_103054_18_miles_E_of_Ridgecrest_3_96.pdf
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July 27, 2019 | 270.64 KB | |
1448_2019-07-27_093741_18_miles_S_of_Hollister_3_87.pdf
|
July 27, 2019 | 318.62 KB | |
1446_2019-07-26_145755_57_miles_N_of_Ridgecrest_2_73.pdf
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July 26, 2019 | 295.51 KB | |
1445_2019-07-26_113203_53_miles_N_of_Ridgecrest_2_87.pdf
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July 26, 2019 | 293.97 KB | |
1444_2019-07-26_004534_35_miles_N_of_Ridgecrest_3_4.pdf
|
July 26, 2019 | 287.54 KB | |
1443_2019-07-26_004247_33_miles_N_of_Ridgecrest_4_17.pdf
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July 26, 2019 | 293.98 KB | |
1411_2019-07-18_035914_57_miles_N_of_Ridgecrest_4_27.pdf
|
July 26, 2019 | 299.73 KB | |
1414_2019-07-18_100518_36_miles_SW_of_Ferndale_3_42.pdf
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July 26, 2019 | 201.11 KB | |
1442_2019-07-24_222418_66_miles_N_of_Ridgecrest_3_55.pdf
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July 24, 2019 | 295.57 KB | |
1441_2019-07-24_143518_6_miles_E_of_Ridgecrest_3_62.pdf
|
July 24, 2019 | 282.68 KB | |
1440_2019-07-23_234548_29_miles_N_of_Ridgecrest_3_59.pdf
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July 24, 2019 | 286.50 KB | |
1439_2019-07-23_074502_21_miles_E_of_Ridgecrest_4_06.pdf
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July 23, 2019 | 267.33 KB | |
1437_2019-07-22_162656_15_miles_S_of_Twentynine_Palms_4_36.pdf
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July 23, 2019 | 321.28 KB | |
1436_2019-07-21_011833_45_miles_S_of_Calexico_3_59.pdf
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July 21, 2019 | 268.82 KB | |
1435_2019-07-20_155753_21_miles_E_of_Cloverdale_3_19.pdf
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July 20, 2019 | 307.93 KB | |
1434_2019-07-20_023843_29_miles_N_of_Ridgecrest_3_73.pdf
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July 20, 2019 | 285.72 KB | |
1433_2019-07-19_184014_32_miles_SW_of_La_Quinta_3_71.pdf
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July 19, 2019 | 355.35 KB | |
1432_2019-07-19_174117_41_miles_SW_of_Ferndale_2_87.pdf
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July 19, 2019 | 188.80 KB |