To navigate directly to the desired publication section, choose from the desired publication topics below: ShakeAlert Allen, R. M., 2007: The ElarmS earthquake warning methodology and application across California. In: Gasparini P, Zschau J (eds.), Seismic Early Warning. New York: Springer, pp. 21–44. Allen, R. M., H. Brown, M. Hellweg, O. Khainovski, P. Lombard, […]
Domniki AsimakiProfessor of Civil and Environmental EngineeringCalifornia Institute of Technologydomniki@caltech.edu James L. Beck George W. Housner Professor of Engineering and Applied ScienceCalifornia Institute of Technologyjimbeck@caltech.eduWebsite Rayomand (Rayo) BhadhaScientific Support, Seismological LaboratoryCalifornia Institute of Technologyrayo@gps.caltech.edu Michael BlackTechnical Support, Seismological LaboratoryCalifornia Institute of Technologymlb@gps.caltech.edu Julian J. BunnPrincipal Computational ScientistCalifornia Institute of Technology, CACRjulian.bunn@caltech.edu K. Mani ChandySimon Ramo Professor […]
Earthquake Early Warning relies on rapid detection and transmission of ground motions from an on-going earthquake. Current EEW systems use ground motions measured by seismometers installed across California. These seismic stations are part of the California Integrated Seismic Network (CISN), a collaborative organization of state and federal government agencies as well as universities. Additional information is […]
To assist users of ShakeAlert®, we have developed EEWDisplay (formerly named UserDisplay) a demonstration software, which visualizes alert information from ShakeAlert (Böse et al., 2012). The EEWDisplay runs on a user’s computer, receives XML messages from ShakeAlert and displays their content in a simple and easily understandable way. The application is written in Java and […]
Current “Prior” research aims to make Earthquake Early Warning faster and more accurate. A new algorithm has been developed that uses Bayesian probabilistic inference to provide optimally fast estimates of earthquake location; in many cases, the earthquake location is available as soon as the first P-wave arrival at the station located closest to the epicenter. […]
NOTE: the OnSite algorithm has been deprecated in ShakeAlert V2.0 The τc-Pd Onsite algorithm is one of the methods included in the current ShakeAlert prototype system. More information on the basics of the method can be found Here. Performance Running an algorithm continuously in real-time provides a wealth of new challenges and observations compared with […]
ShakeAlert ® is a distributed system, enabling the independent development of individual components. It has also been designed to use multiple algorithms, whose information is combined to provide single alerts to end users. This framework facilitates ongoing development and updates of the system, as new research is conducted and methods developed. Scientists at Caltech have […]
Starting in 2007, Caltech has been part of a multi-institutional collaboration of scientists and engineers to create a US-based earthquake early warning (EEW) system. Working with USGS Pasadena, UC Berkeley, ETH and USC/SCEC , the effort includes the development and implementation of the demonstration system for California deployed in 2012, called ShakeAlert® (Böse et al., 2012). ShakeAlert® makes […]
Three algorithms for rapidly detecting the start of an earthquake have been developed and will be improved and integrated into the ShakeAlert® System: ElarmS – ElarmS, or Earthquake Alarm Systems, detects the initial energy to radiate from an earthquake, the P-wave energy, which rarely causes and damage. Using the arrival time of the P-wave at the […]
What if the ShakeAlert® Earthquake System Had Been Operating During the M6.7 1994 Northridge Earthquake?