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Conference Paper

Adapting an existing seismic network to the earthquake early warning mission – southern California experience

Authors

Biasi,  Glenn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Alvarez,  Mark G.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Stubailo,  Igor
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Given,  Douglas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Husker,  Allen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bhadha,  Rayomand
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Biasi, G., Alvarez, M. G., Stubailo, I., Given, D., Husker, A., Bhadha, R. (2023): Adapting an existing seismic network to the earthquake early warning mission – southern California experience, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2977


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018905
Abstract
Earthquake early warning (EEW) for California was initially conceived as a faster version of normal seismic network operations. For the Southern California Seismic Network (SCSN) this early view has been found to be well short of reality. We review lessons SCSN learned through implementation of the ShakeAlert EEW system on the west coast of the United States. EEW-based adaptations affect stations, telemetry, and data acquisition, processing and archiving. Station coverage in the SCSN was good at the start of EEW implementation but 5+ years of permitting and station installations have been required to reduce EEW detection times to target levels. SCSN started with an advantage not all ShakeAlert networks enjoyed as installed dataloggers could stream the 1-second data packets needed for low data latency. Telemetry priorities can differ between EEW and normal network operations. EEW can only use low-latency data; network operators want complete data to simplify archiving and can accept some latency. EEW only requires three channels of strong-motion data; networks prefer 6 channels, with velocity data. We found that during strong earthquake shaking some links could not support both and developed severe latency. To meet both requirements, telemetry links are now being re-engineered. Multicasting is needed to allow waveform data to be shared across multiple servers for redundant processing. EEW algorithms require separate waveform processing and trigger detection. Specialized algorithms are also required to estimate magnitudes from limited P-wave amplitude data. While similar in appearance, EEW places unique and unanticipated demands on our regional seismic network.