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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1613_2020-05-31_010715__30_6_mi_NE_of_Mammoth_Lakes_4_4.pdf
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May 31, 2020 | 296.24 KB | |
1612_2020-05-30_092257__31_1_mi_NE_of_Mammoth_Lakes_3_5.pdf
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May 30, 2020 | 285.82 KB | |
1611_2020-05-28_191913__13_4_mi_NE_of_Gonzales_3_7.pdf
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May 28, 2020 | 332.01 KB | |
1610_2020-05-27_045231___3_1_mi_E_of_Bakersfield_3_6.pdf
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May 27, 2020 | 328.80 KB | |
1609_2020-05-24_125509__17_4_mi_N_of_Ridgecrest_3_9.pdf
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May 24, 2020 | 288.37 KB | |
1608_2020-05-20_164056__11_2_mi_NE_of_Ridgecrest_3_6.pdf
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May 20, 2020 | 277.25 KB | |
1607_2020-05-19_155831__23_1_mi_SW_of_Fortuna_4_1.pdf
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May 19, 2020 | 209.04 KB | |
1606_2020-05-19_071539__22_2_mi_SE_of_Mexicali_B_C__3_3.pdf
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May 19, 2020 | 265.15 KB | |
1605_2020-05-16_014656__39_4_mi_N_of_Ridgecrest_3_5.pdf
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May 16, 2020 | 301.04 KB | |
1604_2020-05-10_220740__23_1_mi_W_of_Westmorland_4_4.pdf
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May 10, 2020 | 334.42 KB | |
1603_2020-05-10_044601_128_8_mi_W_of_Port_Alberni_4_7.pdf
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May 10, 2020 | 161.37 KB | |
1535_2019-12-27_022147__11_1_mi_N_of_Ridgecrest_3_7.pdf
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May 08, 2020 | 284.51 KB | |
1602_2020-05-06_082705___7_3_mi_NW_of_Calipatria_3_6.pdf
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May 06, 2020 | 305.87 KB | |
1601_2020-05-02_234437___4_8_mi_SW_of_Holtville_3_5.pdf
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May 02, 2020 | 281.51 KB | |
1600_2020-04-29_121038___3_1_mi_SE_of_Bishop_3_9.pdf
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April 29, 2020 | 303.45 KB | |
1599_2020-04-27_034600__10_4_mi_E_of_Ridgecrest_3_9.pdf
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April 27, 2020 | 281.75 KB | |
1598_2020-04-22_070347___1_8_mi_N_of_Inglewood_3_8.pdf
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April 22, 2020 | 346.55 KB | |
1597_2020-04-21_051331__30_8_mi_NE_of_Mammoth_Lakes_4_1.pdf
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April 21, 2020 | 296.95 KB | |
1596_post_event_summary.pdf
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April 19, 2020 | 108.66 KB | |
1595_2020-04-18_125014__31_6_mi_NE_of_Ridgecrest_3_5.pdf
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April 18, 2020 | 275.55 KB | |
1594_2020-04-16_134906__31_5_mi_NE_of_Mammoth_Lakes_3_9.pdf
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April 16, 2020 | 295.04 KB | |
1593_2020-04-15_201305__31_0_mi_NE_of_Mammoth_Lakes_3_8.pdf
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April 15, 2020 | 295.54 KB | |
1592_2020-04-11_213645__31_2_mi_NE_of_Mammoth_Lakes_3_9.pdf
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April 11, 2020 | 295.04 KB | |
1591_2020-04-11_165750__15_4_mi_N_of_Mammoth_Lakes_4_1.pdf
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April 11, 2020 | 309.74 KB | |
1590_2020-04-11_162250__30_7_mi_NE_of_Mammoth_Lakes_4_7.pdf
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April 11, 2020 | 315.60 KB | |
1589_2020-04-11_143637__31_7_mi_NE_of_Mammoth_Lakes_5_3.pdf
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April 11, 2020 | 290.39 KB | |
1588_2020-04-06_155814__17_0_mi_SE_of_Coachella_3_6.pdf
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April 06, 2020 | 316.46 KB | |
1587_2020-04-05_223718__14_8_mi_SW_of_La_Quinta_3_9.pdf
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April 05, 2020 | 354.06 KB | |
1586_2020-04-05_210744__15_9_mi_SW_of_La_Quinta_3_9.pdf
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April 05, 2020 | 356.45 KB | |
1585_2020-04-05_192046__10_1_mi_SE_of_Mammoth_Lakes_4_4.pdf
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April 05, 2020 | 324.10 KB | |
1584_2020-04-04_051235__15_6_mi_SW_of_La_Quinta_3_6.pdf
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April 04, 2020 | 359.13 KB | |
1583_2020-04-04_040722__15_9_mi_SW_of_La_Quinta_3_6.pdf
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April 04, 2020 | 358.04 KB | |
1582_2020-04-04_031746___8_9_mi_S_of_Tehachapi_3_6.pdf
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April 04, 2020 | 337.06 KB | |
1581_2020-04-04_020500__15_6_mi_SW_of_La_Quinta_3_6.pdf
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April 04, 2020 | 358.14 KB | |
1580_2020-04-04_015532__14_8_mi_SW_of_La_Quinta_2_9.pdf
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April 04, 2020 | 357.18 KB | |
1579_2020-04-04_015422__15_3_mi_SW_of_La_Quinta_3_6.pdf
|
April 04, 2020 | 358.26 KB | |
1578_2020-04-04_015318__15_4_mi_SW_of_La_Quinta_4_6.pdf
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April 04, 2020 | 360.38 KB | |
1577_2020-03-25_115737__13_6_mi_E_of_Cloverdale_3_8.pdf
|
March 25, 2020 | 316.94 KB | |
1576_2020-03-23_100755__31_5_mi_SW_of_Rio_Dell_3_7.pdf
|
March 23, 2020 | 188.75 KB | |
1575_2020-03-23_055357__29_0_mi_NE_of_Ridgecrest_4_1.pdf
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March 23, 2020 | 277.80 KB | |
1574_2020-03-22_162738__37_0_mi_W_of_Fortuna_4_7.pdf
|
March 22, 2020 | 190.75 KB | |
1573_post_event_summary.pdf
|
March 21, 2020 | 200.29 KB | |
1572_2020-03-20_115254___8_8_mi_E_of_Ridgecrest_3_5.pdf
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March 20, 2020 | 278.02 KB | |
1571_2020-03-18_220821__20_6_mi_SW_of_Rio_Dell_5_0.pdf
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March 18, 2020 | 230.08 KB | |
1570_2020-03-14_222858__16_5_mi_N_of_Willits_3_3.pdf
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March 14, 2020 | 290.25 KB | |
1569_2020-03-11_011716__14_2_mi_S_of_Loyalton_3_8.pdf
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March 11, 2020 | 318.23 KB | |
1568_2020-03-08_061600__11_2_mi_E_of_Cloverdale_3_0.pdf
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March 08, 2020 | 312.37 KB | |
1567_2020-03-08_003331__35_4_mi_N_of_Ridgecrest_3_7.pdf
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March 08, 2020 | 299.69 KB | |
1566_2020-03-07_125116__35_5_mi_N_of_Ridgecrest_3_5.pdf
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March 07, 2020 | 298.40 KB | |
1565_2020-03-07_084913__35_2_mi_N_of_Ridgecrest_3_4.pdf
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March 07, 2020 | 298.71 KB |