Post ShakeAlert Message Summaries provide information about earthquakes detected by the USGS component of ShakeAlert Earthquake Early Warning System (see graphic below). They summarize how accurately the ShakeAlert system estimated an earthquake’s location, magnitude, shaking intensities, how much warning time for selected nearby cities, and how many seismic stations contributed data to these estimates. Estimated warning times on the summaries does not include the additional time it takes for ShakeAlert Licensed Operators to deliver alerts to end-users (e.g. alert delivery to cell phones). Summaries are automatically generated for earthquakes with an estimated peak magnitude (M) of 3.5 or larger. For earthquakes estimated at M4.0 or larger, ShakeAlert Messages are human-reviewed and forwarded to the USGS Earthquake Hazards Program to be posted at www.earthquake.usgs.gov. ShakeAlert produces summaries for earthquakes less than M4.0 to test software readiness, but the 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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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
|
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
|
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
|
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
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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
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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
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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
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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
|
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
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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
|
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
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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
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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
|
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 | |
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
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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
|
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 |