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California, Oregon, and Washington are currently implementing a public earthquake early warning (EEW) system, called ShakeAlert. To detect earthquakes and to generate alerts, ShakeAlert feeds data from the seismic and geodetic networks operated along the US West Coast into two algorithms: the point-source EPIC (formerly known as ElarmS and Onsite), and the finite-source Finite-Fault Rupture Detector (FinDer) algorithm. Alert messages from EPIC and FinDer are aggregated into a single alert feed.
ShakeAlert started in 2012 as a demonstration system for EEW and provided warnings of imminent strong ground shaking to a selected group of test users. At that stage, the Virtual Seismologist (VS; Cua and Heaton, 2009), implemented and tested by the SED, was part of the system. In 2013, California passed legislation to implement a public warning system. After the US Congress approved the funding in 2014, the transition to a public system started. A limited public roll-out of ShakeAlert started in California, Oregon, and Washington in the fall of 2018. About one year later the testing of public alerting on mobile devices (phones) was rolled out in California. Washington, and Oregon followed in 2021. Alerts can be received as Wireless Emergency Alerts (WEA) on mobile devices, as well as through apps (e.g. MyShake, QuakeAlertUSA, and ShakeReadySD), or through a ShakeAlert-powered earthquake alert feature that is integrated into the Android Operating System.
The SED collaborates with the ShakeAlert team (US Geological Survey, Caltech, UC Berkeley, University of Washington, and University of Oregon) in the development, implementation, and testing of FinDer (Böse et al., 2012; Böse et al., 2015; Böse et al., 2018; Böse et al., 2023). |
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| Project Leader al SED | Dr. Maren Böse |
| Partecipanti del SED | Dr. Frederick Massin, Dr. Savas Ceylan, Dr. John Clinton |
| Finanziamento | United States Geological Survey (USGS) |
| Durata | Since 2012 |
| Parole chiavi | Earthquake early warning, real-time seismology |
| Settore di ricerca | Earthquake Early Warning |
| Website | https://www.shakealert.org/ |
- Böse, M., J. Andrews, R. Hartog, and C. Felizardo (2023). Performance and Next Generation Development of the Finite-Fault Rupture De-tector (FinDer) within the United States West Coast ShakeAlert Warning System. Bull. Seismol. Soc. Am. 113 2, 648-663. doi: 10.1785/0120220183
- Chung, A., M. Meier, J. Andrews, M. Böse, B. Crowell, J. McGuire, D. Smith (2020). ShakeAlert Earthquake Early Warning System Performance during the 2019 Ridgecrest Earthquake Sequence. Bull. Seismol. Soc. Am. 110 (4), 1904–1923. doi: 10.1785/0120200032
- Böse, M., D.E. Smith, C. Felizardo, M.-A. Meier, T.H. Heaton, J.F. Clinton (2018). FinDer v.2: Improved Real-time Ground-Motion Predictions for M2-M9 with Seismic Finite-Source Characterization. Geophys. J. Int. 212, 725-742.
- Behr, Y., J. F. Clinton, P. Kästli, C. Cauzzi, and M.-A. Meier (2015). Anatomy of an Earthquake Early Warning (EEW) Alert : Predicting Time Delays for an End-to-End EEW System. Seismol. Res. Lett. 86 (3), 1-11. doi: 10.1785/0220140179
- Meier, M.-A., T. Heaton, and J. Clinton (2015). The Gutenberg Algorithm: Evolutionary Bayesian Magnitude Estimates for Earthquake Early Warning with a Filter Bank. Bull. Seismol. Soc. Am. 105 (5), 2774-2786. doi: 10.1785/0120150098
- Böse, M., C. Felizardo, & T.H. Heaton (2015). Finite-Fault Rupture Detector (FinDer): Going Real-Time in Californian ShakeAlert Warning System. Seismol. Res. Lett. 86 (6), 1692-1704.
- Böse, M., R. Graves, D. Gill, S. Callaghan, and P. Maechling (2014). CyberShake-Derived Ground-Motion Prediction Models for the Los Angeles Region with Applica-tion to EEW. Geophys. J. Int. 198 (3), 1438-1457.
- Given, D.D., Cochran, E.S., Heaton, T., Hauksson, E., Allen, R., Hellweg, P., Vidale, J., and Bodin, P. (2014). Technical implementation plan for the ShakeAlert production system—An Earthquake Early Warning system for the West Coast of the United States. U.S. Geological Survey Open-File Report 2014–1097, 25. doi: 10.3133/ofr20141097
- Böse, M., R. Allen, H. Brown, C. Cua, M. Fischer, E. Hauksson, T. Heaton, M. Hellweg, M. Liukis, D. Neu-hauser, P. Maechling, P. and CISN EEW Group (2013). CISN ShakeAlert – An Earthquake Early Warning Demonstration System for California. In: F. Wenzel and J. Zschau: Early Warning for Geological Disasters - Scientific Methods and Current Practice (ISBN: 978-3-642-12232-3). Springer Berlin Heidelberg New York:
- Böse, M., T.H. Heaton, & E. Hauksson (2012). Real-time Finite Fault Rupture Detector (FinDer) for Large Earthquakes. Geophys. J. Int. 191 (2), 803-812.
- Böse, M., T. Heaton and E. Hauksson (2012). Rapid estimation of earthquake source and ground-motion parameters for earthquake early warning using data from single three-component broadband or strong-motion sensor. Bull. Seismol. Soc. Am. 102 (2), 738-750. doi: 10.1785/0120110152
- Böse, M. & T.H. Heaton (2010). Probabilistic Prediction of Rupture Length, Slip and Seismic Ground Motions for an Ongoing Rupture: implications for Early Warning for Large Earthquakes. Geophys. J. Int. 183 (2), 1014-1030. doi: 10.1111/j.1365-246X.2010.04774.x
- Cua, G. B., M. Fischer, T. H. Heaton, and S. Wiemer (2009). Real-time Performance of the Virtual Seismologist Earthquake Early Warning Algorithm in Southern California. Seismol. Res. Lett. 80 (5), 740-747. doi: 10.1785/gssrl.80.5.740