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- W2549203445 abstract "Abstract The seismogeodetic method computes accurate displacement and velocity waveforms by optimally extracting high‐frequency information from strong‐motion accelerometers and low‐frequency information from collocated Global Positioning System (GPS) instruments. These broadband observations retain the permanent (static) displacement, are immune to clipping and magnitude saturation for large earthquakes, and are sensitive enough to record P ‐wave arrivals. These characteristics make seismogeodesy suitable for real‐time applications such as earthquake early warning. The Scripps Institution of Oceanography (SIO) has developed an inexpensive microelectromechanical systems (MEMS) accelerometer package to upgrade established GPS stations. We compare the performance of our MEMS accelerometer with an observatory‐grade accelerometer using an experiment at the University of California San Diego Large High‐Performance Outdoor Shake Table. We show that the two types of accelerometers agree in frequency ranges of seismological and engineering interest and produce equivalent seismogeodetic estimates of displacement and velocity. To date, 27 SIO MEMS packages have been installed at GPS monitoring stations in southern California and the San Francisco Bay area and have recorded four earthquakes ( M 4.2, M 4.1, and two of M 4.0). The P ‐wave arrivals are distinguishable in the seismogeodetic observations at distances of up to ∼25 km away but not in the GPS‐only displacements. There is no significant permanent deformation for these small events. This study demonstrates the lower limit of detectability and that seismogeodetic waveforms can also be a reliable early confirmation that an event is not large or hazardous. It also raises the possibility of rapid magnitude estimation through scaling relationships." @default.
- W2549203445 created "2016-11-30" @default.
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- W2549203445 date "2016-11-08" @default.
- W2549203445 modified "2023-10-01" @default.
- W2549203445 title "Seismogeodesy Using GPS and Low‐Cost MEMS Accelerometers: Perspectives for Earthquake Early Warning and Rapid Response" @default.
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- W2549203445 doi "https://doi.org/10.1785/0120160062" @default.
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