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 | |
---|---|---|---|
1985_2022-03-31_02:05:26_12.0_mi_W_of_Bishop_4.3.pdf
|
March 31, 2022 | 319.00 KB | |
1984_2022-03-25_21:10:59_6.4_mi_SW_of_Williams_3.8.pdf
|
March 25, 2022 | 290.76 KB | |
1983_2022-03-22_10:33:38_4.2_mi_SE_of_Rancho_Cucamonga_3.4.pdf
|
March 22, 2022 | 398.19 KB | |
1982_2022-03-19_16:59:41_6.4_mi_N_of_Watsonville_3.9.pdf
|
March 19, 2022 | 347.63 KB | |
1981_2022-03-18_04:51:22_37.4_mi_SE_of_South_Lake_Tahoe_4.1.pdf
|
March 18, 2022 | 326.05 KB | |
1980_2022-03-13_20:51:30_15.2_mi_E_of_Gonzales_4.1.pdf
|
March 13, 2022 | 319.86 KB | |
1979_2022-03-07_16:22:42_40.9_mi_N_of_Mammoth_Lakes_3.6.pdf
|
March 07, 2022 | 324.55 KB | |
1978_2022-03-05_15:07:29_16.2_mi_NE_of_Greenfield_3.4.pdf
|
March 05, 2022 | 312.41 KB | |
1977_2022-03-03_11:39:58_13.0_mi_NE_of_Healdsburg_3.5.pdf
|
March 03, 2022 | 316.04 KB | |
1976_2022-03-01_05:01:10_3.0_mi_W_of_Ojai_2.9.pdf
|
March 01, 2022 | 308.28 KB | |
1975_2022-02-28_11:57:25_23.4_mi_S_of_Mexicali_B.C._3.3.pdf
|
February 28, 2022 | 250.74 KB | |
1974_2022-02-27_01:44:18_5.8_mi_NW_of_Santa_Paula_3.9.pdf
|
February 27, 2022 | 294.87 KB | |
1972_2022-02-19_21:35:37_21.8_mi_SW_of_Rio_Dell_3.1.pdf
|
February 22, 2022 | 209.66 KB | |
1973_post_event_summary.pdf
|
February 21, 2022 | 337.00 KB | |
1970_2022-02-12_00:26:19_69.3_mi_W_of_Fortuna_3.9.pdf
|
February 18, 2022 | 103.03 KB | |
1971_post_event_summary.pdf
|
February 18, 2022 | 167.44 KB | |
1969_post_event_summary.pdf
|
February 08, 2022 | 308.69 KB | |
1968_post_event_summary.pdf
|
February 06, 2022 | 395.98 KB | |
1967_post_event_summary.pdf
|
February 06, 2022 | 311.07 KB | |
1966_post_event_summary.pdf
|
February 04, 2022 | 300.17 KB | |
1965_post_event_summary.pdf
|
February 02, 2022 | 330.01 KB | |
1963_post_event_summary.pdf
|
January 22, 2022 | 277.76 KB | |
1962_post_event_summary.pdf
|
January 22, 2022 | 303.57 KB | |
1961_post_event_summary.pdf
|
January 18, 2022 | 351.52 KB | |
1960_post_event_summary.pdf
|
January 17, 2022 | 313.64 KB | |
1959_post_event_summary.pdf
|
January 13, 2022 | 348.84 KB | |
1958_post_event_summary.pdf
|
January 08, 2022 | 319.17 KB | |
1957_post_event_summary.pdf
|
January 06, 2022 | 176.93 KB | |
1956_post_event_summary.pdf
|
January 06, 2022 | 280.64 KB | |
1955_post_event_summary.pdf
|
January 03, 2022 | 315.32 KB | |
1954_post_event_summary.pdf
|
January 01, 2022 | 288.41 KB | |
1953_post_event_summary.pdf
|
December 31, 2021 | 241.65 KB | |
1820_2021-06-12_044137_9_4_mi_NW_of_Calipatria_3_6.pdf
|
December 30, 2021 | 298.60 KB | |
1952_post_event_summary.pdf
|
December 30, 2021 | 114.89 KB | |
1951_post_event_summary.pdf
|
December 28, 2021 | 107.26 KB | |
1944_2021-12-24_14:24:25_33.6_mi_W_of_Rio_Dell_3.6.pdf
|
December 27, 2021 | 163.11 KB | |
1950_post_event_summary.pdf
|
December 26, 2021 | 151.50 KB | |
1949_post_event_summary.pdf
|
December 26, 2021 | 318.13 KB | |
1947_post_event_summary.pdf
|
December 25, 2021 | 105.73 KB | |
1948_post_event_summary.pdf
|
December 25, 2021 | 129.99 KB | |
1946_post_event_summary.pdf
|
December 25, 2021 | 140.12 KB | |
1945_post_event_summary.pdf
|
December 24, 2021 | 142.14 KB | |
1943_post_event_summary.pdf
|
December 24, 2021 | 105.48 KB | |
1942_post_event_summary.pdf
|
December 23, 2021 | 106.56 KB | |
1941_post_event_summary.pdf
|
December 23, 2021 | 240.38 KB | |
1940_post_event_summary.pdf
|
December 21, 2021 | 118.23 KB | |
1939_post_event_summary.pdf
|
December 21, 2021 | 171.19 KB | |
1935_2021-12-20_21:52:53_13.7_mi_W_of_Rio_Dell_3.5.pdf
|
December 21, 2021 | 218.84 KB | |
1938_post_event_summary.pdf
|
December 21, 2021 | 135.36 KB | |
1937_post_event_summary.pdf
|
December 21, 2021 | 248.74 KB |