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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1848_post_event_summary.pdf
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July 21, 2021 | 107.01 KB | |
1847_2021-07-21_100531_17_1_mi_SW_of_Rio_Dell_4_3.pdf
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July 21, 2021 | 229.72 KB | |
1846_2021-07-18_132410_44_8_mi_SE_of_South_Lake_Tahoe_3_9.pdf
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July 18, 2021 | 332.16 KB | |
1845_2021-07-18_064612_24_8_mi_SW_of_Rio_Dell_5_1.pdf
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July 18, 2021 | 207.11 KB | |
1844_2021-07-17_004454_39_5_mi_SE_of_South_Lake_Tahoe_3_5.pdf
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July 17, 2021 | 320.58 KB | |
1843_2021-07-17_003254_40_4_mi_SE_of_South_Lake_Tahoe_3_0.pdf
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July 17, 2021 | 327.24 KB | |
1842_2021-07-15_141828_39_5_mi_SE_of_South_Lake_Tahoe_4_0.pdf
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July 15, 2021 | 324.56 KB | |
1841_2021-07-14_034613_38_7_mi_SE_of_South_Lake_Tahoe_4_1.pdf
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July 14, 2021 | 319.83 KB | |
1840_2021-07-12_034333_47_8_mi_W_of_Fortuna_3_8.pdf
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July 12, 2021 | 142.15 KB | |
1839_2021-07-09_051035_37_3_mi_SE_of_South_Lake_Tahoe_4_7.pdf
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July 09, 2021 | 322.55 KB | |
1838_2021-07-09_050418_38_1_mi_SE_of_South_Lake_Tahoe_4_3.pdf
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July 09, 2021 | 322.46 KB | |
1837_2021-07-09_014600_38_2_mi_SE_of_South_Lake_Tahoe_4_9.pdf
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July 09, 2021 | 318.12 KB | |
1836_2021-07-09_002748_39_1_mi_SE_of_South_Lake_Tahoe_4_4.pdf
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July 09, 2021 | 340.51 KB | |
1835_2021-07-09_000521_43_2_mi_SE_of_South_Lake_Tahoe_4_0.pdf
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July 09, 2021 | 317.03 KB | |
1834_2021-07-08_235853_37_4_mi_SE_of_South_Lake_Tahoe_4_5.pdf
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July 09, 2021 | 327.26 KB | |
1833_2021-07-08_234743_36_7_mi_SE_of_South_Lake_Tahoe_3_7.pdf
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July 08, 2021 | 319.24 KB | |
1832_2021-07-08_234441_36_2_mi_SE_of_South_Lake_Tahoe_3_5.pdf
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July 08, 2021 | 326.04 KB | |
1831_2021-07-08_233341_39_2_mi_SE_of_South_Lake_Tahoe_4_9.pdf
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July 08, 2021 | 362.09 KB | |
1830_2021-07-08_231103_39_8_mi_SE_of_South_Lake_Tahoe_3_6.pdf
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July 08, 2021 | 327.31 KB | |
1829_post_event_summary.pdf
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July 08, 2021 | 386.39 KB | |
1827_2021-07-08_224948_38_7_mi_SE_of_South_Lake_Tahoe_5_9.pdf
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July 08, 2021 | 352.24 KB | |
1828_post_event_summary.pdf
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July 08, 2021 | 331.23 KB | |
1827_2021-07-08_224948_38_7_mi_SE_of_South_Lake_Tahoe_6_2.pdf
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July 08, 2021 | 349.28 KB | |
1826_2021-07-06_023801_8_8_mi_NE_of_Ridgecrest_3_6.pdf
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July 06, 2021 | 269.44 KB | |
1825_2021-07-03_232351_2_2_mi_W_of_Los_Banos_3_8.pdf
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July 03, 2021 | 340.89 KB | |
1824_2021-07-03_082225_3_9_mi_NW_of_Fontana_3_5.pdf
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July 03, 2021 | 356.71 KB | |
1823_2021-06-29_012948_2_2_mi_SE_of_San_Leandro_4_1.pdf
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June 29, 2021 | 379.42 KB | |
1822_2021-06-23_082537_23_3_mi_SW_of_Loyalton_3_6.pdf
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June 23, 2021 | 353.32 KB | |
1821_2021-06-18_082225_16_1_mi_W_of_El_Centro_3_5.pdf
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June 18, 2021 | 293.51 KB | |
1819_2021-06-12_043946_9_5_mi_NW_of_Calipatria_4_3.pdf
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June 14, 2021 | 328.43 KB | |
1817_2021-06-12_043028_9_5_mi_NW_of_Calipatria_3_9.pdf
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June 14, 2021 | 313.16 KB | |
1816_2021-06-14_031624_10_2_mi_E_of_Cloverdale_3_5.pdf
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June 14, 2021 | 319.42 KB | |
1815_2021-06-13_174313_7_0_mi_N_of_Westmorland_3_1.pdf
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June 13, 2021 | 306.09 KB | |
1814_2021-06-13_065447_10_1_mi_E_of_Cloverdale_3_5.pdf
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June 13, 2021 | 320.72 KB | |
1813_2021-06-12_141639_8_7_mi_NW_of_Calipatria_2_8.pdf
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June 12, 2021 | 307.95 KB | |
1812_2021-06-12_111229_8_7_mi_NW_of_Shelton_3_6.pdf
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June 12, 2021 | 332.54 KB | |
1811_2021-06-12_055520_10_0_mi_NW_of_Calipatria_3_6.pdf
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June 12, 2021 | 307.50 KB | |
1810_2021-06-12_042734_9_5_mi_NW_of_Calipatria_3_4.pdf
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June 12, 2021 | 310.79 KB | |
1809_2021-06-11_104553_5_3_mi_E_of_Watsonville_3_5.pdf
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June 11, 2021 | 339.07 KB | |
1808_post_event_summary.pdf
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June 07, 2021 | 172.87 KB | |
1806_2021-06-07_211911_7_6_mi_W_of_Calipatria_3_4.pdf
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June 07, 2021 | 310.14 KB | |
1807_2021-06-07_214643_7_9_mi_NW_of_Calipatria_2_7.pdf
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June 07, 2021 | 306.34 KB | |
1805_2021-06-07_210828_7_7_mi_NW_of_Calipatria_4_3.pdf
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June 07, 2021 | 322.66 KB | |
1804_2021-06-07_155803_6_2_mi_NW_of_Calipatria_2_5.pdf
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June 07, 2021 | 303.89 KB | |
1803_2021-06-07_054435_6_5_mi_W_of_Calipatria_3_4.pdf
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June 07, 2021 | 306.54 KB | |
1802_2021-06-06_035137_26_8_mi_S_of_Hood_River_4_0.pdf
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June 06, 2021 | 327.23 KB | |
1801_2021-06-06_030823_6_6_mi_W_of_Calipatria_3_5.pdf
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June 06, 2021 | 306.59 KB | |
1800_2021-06-05_190707_5_7_mi_W_of_Calipatria_2_8.pdf
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June 05, 2021 | 298.68 KB | |
1799_2021-06-05_190531_6_5_mi_W_of_Calipatria_3_4.pdf
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June 05, 2021 | 302.26 KB | |
1798_2021-06-05_175558_6_9_mi_W_of_Calipatria_5_3.pdf
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June 05, 2021 | 285.68 KB |