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ShakeAlert

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Journal Article
Published: 22 September 2022
Seismological Research Letters (2022)
...Maren Böse; Jennifer Andrews; Colin O’Rourke; Deborah Kilb; Angela Lux; Julian Bunn; Jeffrey McGuire Abstract We test the behavior of the United States (US) West Coast ShakeAlert earthquake early warning (EEW) system during temporally close earthquake pairs to understand current performance...
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Journal Article
Published: 08 September 2021
Seismological Research Letters (2022) 93 (1): 277–287.
...Mika Thompson; J. Renate Hartog; Erin A. Wirth Abstract We investigate whether assuming a fixed shallow depth in the ShakeAlert network‐based earthquake early warning system is sufficient to produce accurate ground‐motion based alerts for intraslab earthquakes. ShakeAlert currently uses a fixed...
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Journal Article
Published: 18 November 2020
Seismological Research Letters (2021) 92 (1): 170–186.
...), to support the ShakeAlert earthquake early warning (EEW) system in California. ShakeAlert is a U.S. Geological Survey (USGS)‐led collaboration to detect earthquakes and, when possible, to alert the public before the arrival of the strongest shaking. The SCSN performed well in its regional monitoring role...
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Journal Article
Published: 21 July 2020
Bulletin of the Seismological Society of America (2020) 110 (4): 1904–1923.
...Angela I. Chung; Men‐Andrin Meier; Jennifer Andrews; Maren Böse; Brendan W. Crowell; Jeffrey J. McGuire; Deborah E. Smith ABSTRACT During July 2019, a sequence of earthquakes, including an M w 6.4 foreshock and an M w 7.1 mainshock, occurred near Ridgecrest, California. ShakeAlert, the U.S...
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Journal Article
Published: 08 April 2020
Seismological Research Letters (2020) 91 (3): 1763–1775.
...Monica D. Kohler; Deborah E. Smith; Jennifer Andrews; Angela I. Chung; Renate Hartog; Ivan Henson; Douglas D. Given; Robert de Groot; Stephen Guiwits Abstract The ShakeAlert earthquake early warning system is designed to automatically identify and characterize the initiation and rupture evolution...
FIGURES
Journal Article
Published: 20 March 2019
Seismological Research Letters (2019) 90 (3): 1243–1257.
... (eqInfo2GM), has been implemented as part of the ShakeAlert earthquake early warning (EEW) system and makes estimated GM accessible to users on the EEW timeframe of seconds, as the U.S. Geological Survey ShakeMap does at higher resolution and accuracy in the minutes following a seismic event. Whereas...
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Journal Article
Published: 06 December 2017
Seismological Research Letters (2018) 89 (1): 108–117.
... earthquakes. An earthquake early warning system, ShakeAlert, is providing alerts to beta end users in the western United States, specifically California, Oregon, and Washington. An essential aspect of the earthquake early warning system is the development of a framework to test modifications to code to ensure...
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Journal Article
Published: 06 December 2017
Seismological Research Letters (2018) 89 (1): 99–107.
.... The goal is to create and operate an EEW system, called ShakeAlert, for the highest risk areas of the United States, starting with the West Coast states of California, Oregon, and Washington. In early 2016, the Production Prototype v.1.0 was established for California; then, in early 2017, v.1.2...
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Journal Article
Published: 05 July 2016
Bulletin of the Seismological Society of America (2016) 106 (4): 1875–1886.
..., a demonstration EEW system was developed by partners in the California Integrated Seismic Network (CISN) and scientists from the Swiss Federal Institute of Technology (ETH Zurich). This system, called CISN ShakeAlert, started sending warnings to test users in January 2012, but warnings are not publicly...
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Journal Article
Published: 07 October 2015
Seismological Research Letters (2015) 86 (6): 1692–1704.
... of the assumed line source. Estimates are updated regularly as new data become available (e.g., every second). Encouraged by its promising real-time performance during the recent moderate-size 2014 M  5.1 La Habra and M  6.0 South Napa earthquakes in southern and northern California, the ShakeAlert...
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The timeline of the <span class="search-highlight">ShakeAlert</span> rollout on the West Coast of the United Stat...
Published: 27 December 2022
Figure 2. The timeline of the ShakeAlert rollout on the West Coast of the United States (the dotted vertical lines), over time from 1985 to 2021. These times are superimposed on the cumulative number of M4.5+ earthquakes for which the USGS issued a ShakeAlert Message in California, Oregon
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Image of a <span class="search-highlight">ShakeAlert</span>-powered alert delivered via the IPAWS system, with th...
Published: 27 December 2022
Figure 3. Image of a ShakeAlert-powered alert delivered via the IPAWS system, with the 2014 M6 Napa, California earthquake (with an orange star for its epicenter) and its MMI isoseismals with the scale in the legend. Seismometers that could detect the earthquake for the ShakeAlert system
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PLUM and <span class="search-highlight">ShakeAlert</span> real‐time alert performance for the 5 June 2021  M  5.3...
Published: 28 July 2022
Figure 7. PLUM and ShakeAlert real‐time alert performance for the 5 June 2021 M  5.3 Calipatria earthquake. The map information follows that of Figure  5 . PLUM and ShakeAlert generated first alerts at approximately the same time. ShakeAlert’s epicenter estimate is very close to the actual
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PLUM and <span class="search-highlight">ShakeAlert</span> real‐time alert performance for the 18 July 2021  M  5....
Published: 28 July 2022
Figure 8. PLUM and ShakeAlert real‐time alert performance for the 18 July 2021 M  5.1 Petrolia earthquake. The map information follows that of Figure  5 . This earthquake had a source depth of 30.9 km, and we estimate that the S wave was not at the surface at the time of the ShakeAlert first
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PLUM and <span class="search-highlight">ShakeAlert</span> real‐time alert performances for the 8 July 2021  M  6....
Published: 28 July 2022
Figure 6. PLUM and ShakeAlert real‐time alert performances for the 8 July 2021 M  6.0 Antelope Valley earthquake. The map information follows that of Figure  5 . ShakeAlert created three separate events for M  6.0 Antelope Valley earthquake: an M  4.8 76 km to the southeast of the epicenter
Journal Article
Published: 28 September 2022
Seismological Research Letters (2022)
...Danielle F. Sumy; Mariah R. Jenkins; Jenny Crayne; Shelley E. Olds; Megan L. Anderson; Jenda Johnson; Bonnie Magura; Cynthia L. Pridmore; Robert‐Michael de Groot Abstract As of May 2021, public alerting is now operational for the ShakeAlert earthquake early warning system for the West Coast...
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PLUM and <span class="search-highlight">ShakeAlert</span> real‐time alert performances for the 20 December 2021  ...
Published: 28 July 2022
Figure 5. PLUM and ShakeAlert real‐time alert performances for the 20 December 2021 M  5.7 and 6.2 Petrolia earthquake sequence. The contour map and squares indicate the distribution of MMI from ShakeMap and DYFI, respectively. The dark blue ShakeMap contour and DYFI squares outlined in dark
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PLUM and <span class="search-highlight">ShakeAlert</span> real‐time alert performance for the 7 May 2021  M  4.7 ...
Published: 28 July 2022
Figure 9. PLUM and ShakeAlert real‐time alert performance for the 7 May 2021 M  4.7 Truckee earthquake. The map information follows that of Figure  5 . Note that the ShakeAlert MMI 2.5+ alert perimeter extends beyond the San Francisco Bay area in the southwest corner of the map and extends
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(a) A map of alert delivery times for the September 2020  M  4.5 El Monte e...
Published: 05 August 2022
Figure 7. (a) A map of alert delivery times for the September 2020 M  4.5 El Monte event, within 30 s of ShakeAlert producing its first alert (initial alerting radius marked by the red circle). The largest estimate (yellow circle) occurred 7.7 s after the initial. (b) A map of alert delivery
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Formative dialogue, resource development, and outreach and dissemination ar...
Published: 28 September 2022
Figure 3. Formative dialogue, resource development, and outreach and dissemination are three iterative processes conducted throughout the project life cycle. Initially, the ShakeAlert Joint Committee for Communication, Education, Outreach, and Technical Engagement (JCCEO&TE) conducts several