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GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L06604, doi:10.1029/2003GL019150, 2004

Detection of arbitrarily large dynamic ground motions with a dense high-rate GPS network

Yehuda Bock

Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, California, USA


Linette Prawirodirdjo

Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, California, USA


Timothy I. Melbourne

Department of Geological Sciences, Central Washington University, Ellensburg, Washington, USA


Abstract

We describe the detection of teleseismic surface waves from the 3 November 2002 Mw 7.9 Denali fault earthquake in Alaska with a dense network of 1 Hz GPS stations in southern California, about 3900 km from the event. Relative horizontal displacements with amplitudes in excess of 15 mm and duration of 700 seconds agree with integrated velocities recorded by nearby broadband seismometers with an rms difference of 2–3 mm. The displacements are derived from independent 1 Hz instantaneous positions demonstrating that a GPS network can provide direct measurements of arbitrarily large dynamic and static ground horizontal displacements at periods longer than 1 s and amplitudes above 2 mm, with an inherent precision (signal to noise) that improves indefinitely with amplitude without clipping and in real time. High-rate, real-time GPS networks can enhance earthquake detection and seismic risk mitigation and support other applications such as intelligent transportation and civil infrastructure monitoring.

Received 24 November 2003; accepted 4 February 2004; published 18 March 2004.

Index Terms: 1242 Geodesy and Gravity: Seismic deformations (7205); 1294 Geodesy and Gravity: Instruments and techniques; 7212 Seismology: Earthquake ground motions and engineering; 7294 Seismology: Instruments and techniques; 7205 Seismology: Continental crust (1242).

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Citation: Bock, Y., L. Prawirodirdjo, and T. I. Melbourne (2004), Detection of arbitrarily large dynamic ground motions with a dense high-rate GPS network, Geophys. Res. Lett., 31, L06604, doi:10.1029/2003GL019150.