- © 2014 by the Seismological Society of America
Online Material: Movies of temporal deployment of USArray and seismicity: event processing flow chart; travel‐time and magnitude statistics plots; tables of earthquake catalogs, magnitude bias, and picked arrivals.
The Array Network Facility (ANF), funded by the National Science Foundation Earthscope‐USArray project, is responsible for (1) collection of all transportable array (TA) station data and generation of station metadata; (2) their delivery to the Incorporated Research Institutions for Seismology Data Management Center (IRIS‐DMC). (3) Providing useful interfaces for field operations personnel at the Array Operations Facility (AOF) to obtain state‐of‐health information; (4) TA station command and control, such as seismometer mass centering and calibration; (5) collection of data from contributing regional network stations; and (6) data quality monitoring and control. Herein, we provide a brief overview of the evolution of USArray operations with emphasis on aspects relevant to the production of the ANF Seismic Bulletin.
To begin operations at the ANF, real‐time acquisition of continuous three‐component broadband seismic data from 62 regional stations in California was initiated in April 2004. Seismic and state‐of‐health data from TA stations started flowing to the ANF shortly thereafter, with 73 stations transmitting data continuously by the end of 2004. A steady influx of data from newly deployed TA stations ensued with the first footprint of 400 USArray stations operating by mid‐September 2007 (Figs. 1a and 2a). USArray then began to migrate or roll eastward at an annual rate of about 200 stations, with the second and third distinct footprints being deployed by September 2009 and 2011, respectively (Fig. 1b and c). Deployment of the last distinct footprint was completed by October 2013. Figure 1d shows …