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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
1460_2019-08-19_000912__47_6_mi_NE_of_California_City_3_6.pdf
August 19, 2019 270.38 KB
1459_2019-08-15_115024__64_5_mi_E_of_Porterville_3_6.pdf
August 16, 2019 295.44 KB
1458_2019-08-14_225226_53_miles_N_of_Ridgecrest_3_49.pdf
August 14, 2019 293.61 KB
1457_2019-08-14_210411_30_miles_N_of_Ridgecrest_3_56.pdf
August 14, 2019 286.86 KB
1456_2019-08-14_093419_30_miles_N_of_Ridgecrest_3_55.pdf
August 14, 2019 286.20 KB
1455_2019-08-10_190235_62_miles_N_of_Ridgecrest_2_72.pdf
August 10, 2019 300.03 KB
1454_2019-08-03_185358_52_miles_SW_of_Ferndale_2_77.pdf
August 03, 2019 152.43 KB
1453_2019-08-02_121842_18_miles_N_of_Ridgecrest_3_55.pdf
August 02, 2019 281.87 KB
1447_2019-07-27_013537_29_miles_E_of_Ridgecrest_3_39.pdf
August 01, 2019 268.59 KB
1452_2019-07-30_163056_15_miles_E_of_Ridgecrest_3_56.pdf
July 30, 2019 271.93 KB
1451_2019-07-29_231914_22_miles_N_of_Ridgecrest_3_5.pdf
July 29, 2019 283.17 KB
1450_2019-07-27_222220_52_miles_N_of_Ridgecrest_2_16.pdf
July 27, 2019 286.02 KB
1449_2019-07-27_103054_18_miles_E_of_Ridgecrest_3_96.pdf
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
July 26, 2019 295.51 KB
1445_2019-07-26_113203_53_miles_N_of_Ridgecrest_2_87.pdf
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
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
July 26, 2019 201.11 KB
1442_2019-07-24_222418_66_miles_N_of_Ridgecrest_3_55.pdf
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
July 24, 2019 286.50 KB
1439_2019-07-23_074502_21_miles_E_of_Ridgecrest_4_06.pdf
July 23, 2019 267.33 KB
1437_2019-07-22_162656_15_miles_S_of_Twentynine_Palms_4_36.pdf
July 23, 2019 321.28 KB
1436_2019-07-21_011833_45_miles_S_of_Calexico_3_59.pdf
July 21, 2019 268.82 KB
1435_2019-07-20_155753_21_miles_E_of_Cloverdale_3_19.pdf
July 20, 2019 307.93 KB
1434_2019-07-20_023843_29_miles_N_of_Ridgecrest_3_73.pdf
July 20, 2019 285.72 KB
1433_2019-07-19_184014_32_miles_SW_of_La_Quinta_3_71.pdf
July 19, 2019 355.35 KB
1432_2019-07-19_174117_41_miles_SW_of_Ferndale_2_87.pdf
July 19, 2019 188.80 KB
1431_2019-07-19_161658_18_miles_NE_of_Ridgecrest_3_46.pdf
July 19, 2019 271.91 KB
1430_2019-07-19_131426_30_miles_N_of_Ridgecrest_3_54.pdf
July 19, 2019 286.53 KB
1429_2019-07-19_104705_28_miles_E_of_Ridgecrest_3_69.pdf
July 19, 2019 263.05 KB
1428_2019-07-18_214637_18_miles_N_of_Ridgecrest_3_61.pdf
July 19, 2019 281.15 KB
1409_2019-07-17_151151_30_miles_N_of_Ridgecrest_3_52.pdf
July 17, 2019 287.12 KB
1408_2019-07-17_032327_58_miles_N_of_Ridgecrest_3_53.pdf
July 17, 2019 297.58 KB
1407_2019-07-17_022907_58_miles_N_of_Ridgecrest_4_21.pdf
July 17, 2019 298.12 KB
1406_2019-07-16_201536_18_miles_N_of_Ridgecrest_4_33.pdf
July 16, 2019 299.88 KB
1405_2019-07-16_201101_14_miles_N_of_Livermore_4_37.pdf
July 16, 2019 378.95 KB
1404_2019-07-16_024704_21_miles_E_of_Ridgecrest_3_86.pdf
July 16, 2019 267.65 KB
1403_2019-07-15_212953_15_miles_E_of_Ridgecrest_2_93.pdf
July 15, 2019 270.76 KB
1402_2019-07-15_204650_15_miles_N_of_Morgan_Hill_3_45.pdf
July 15, 2019 349.00 KB
1401_2019-07-15_183449_32_miles_N_of_Ridgecrest_3_0.pdf
July 15, 2019 287.54 KB
1400_2019-07-15_154336_23_miles_E_of_Ridgecrest_3_58.pdf
July 15, 2019 264.42 KB
1399_2019-07-15_083845_50_miles_N_of_Ridgecrest_4_01.pdf
July 15, 2019 293.47 KB
1398_2019-07-15_025439_15_miles_E_of_Ridgecrest_3_67.pdf
July 15, 2019 270.34 KB
1397_2019-07-14_231555_54_miles_N_of_Ridgecrest_3_12.pdf
July 14, 2019 294.06 KB
1396_2019-07-14_204015_57_miles_N_of_Ridgecrest_3_23.pdf
July 14, 2019 295.95 KB
1395_2019-07-14_110008_66_miles_N_of_Ridgecrest_3_26.pdf
July 14, 2019 295.24 KB
1394_2019-07-13_102518_44_miles_NE_of_Ridgecrest_3_77.pdf
July 13, 2019 271.35 KB