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Revision of Metadata Sensitivities at IRIS/IDA Stations

2018; Seismological Society of America; Volume: 89; Issue: 3 Linguagem: Inglês

10.1785/0220170280

1938-2057

Weiwei Xu, P. Davis, D. W. Auerbach, Erik Klimczak,

Seismology and Earthquake Studies

Research Article| April 11, 2018 Revision of Metadata Sensitivities at IRIS/IDA Stations Weiwei Xu; Weiwei Xu aKey Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, Chinese Earthquake Administration (CEA), No. 5, Minzudaxue Nanlu, Haidian District, Beijing 100081, China, wwxuww@sina.comcAlso at Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A. Search for other works by this author on: GSW Google Scholar Peter Davis; Peter Davis bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Search for other works by this author on: GSW Google Scholar Dan Auerbach; Dan Auerbach bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Search for other works by this author on: GSW Google Scholar Erik Klimczak Erik Klimczak bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Weiwei Xu aKey Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, Chinese Earthquake Administration (CEA), No. 5, Minzudaxue Nanlu, Haidian District, Beijing 100081, China, wwxuww@sina.comcAlso at Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A. Peter Davis bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Dan Auerbach bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Erik Klimczak bInstitute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive Number 0225, La Jolla, California 92093‐0225 U.S.A., pdavis@ucsd.edu, dauerbach@ucsd.edu, eklimczak@ucsd.edu Publisher: Seismological Society of America First Online: 11 Apr 2018 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2018) 89 (3): 1084–1092. https://doi.org/10.1785/0220170280 Article history First Online: 11 Apr 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Weiwei Xu, Peter Davis, Dan Auerbach, Erik Klimczak; Revision of Metadata Sensitivities at IRIS/IDA Stations. Seismological Research Letters 2018;; 89 (3): 1084–1092. doi: https://doi.org/10.1785/0220170280 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT In seismic data, the published metadata are usually used to record instrument responses and their accuracies, which include zero‐frequency sensitivity for seismometer, data logger, and other frequency‐dependent elements. In this work, we focused on the variations of the seismometer sensitivity with time at the Incorporated Research Institutions for Seismology/International Deployment of Accelerometers (IRIS/IDA) Global Seismographic Network (GSN) seismic stations, with the goal of improving the metadata accuracy for the history of the network. There are several ways to measure the accuracy of seismometer sensitivity for the seismic stations in service. An effective practice recently adopted by the GSN is to collocate a reference seismometer in proximity to permanently installed sensors to verify the in situ sensors' calibration. For those stations with a secondary seismometer, the IRIS MUSTANG system introduced a transfer function metric to reflect two sensors' gain ratios in the microseism frequency band, 4–30 s. In addition, a simulation approach based on measurements of the M2 tidal line (44,712 s period) has proven effective. In this work, we compare and analyze the results from three different sensitivity estimation methods and conclude that the collocated‐sensor method is the most stable and reliable with the minimum uncertainties for the entire network life. However, for calibration epochs lacking both the collocated sensor and secondary seismometer, we rely on the analysis results from the tidal method. For IRIS/IDA data since 1992, we obtained over 1100 revised seismometer sensitivity values spanning all epochs. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.