Transmitting seismic station monitors fault zone at depth
Imaging subsurface structure and monitoring related temporal variations are two of the main tasks for modern seismology. With the accumulation of seismic data, clearer and clearer pictures of the Earth's interior are being achieved. However, precise monitoring of subtle subsurface changes associated with tectonic events remains tricky and is subject to high-performance repeatable seismic sources. Although many observations have been reported on temporal seismic velocity changes in fault zones and volcanic areas, velocity change measurements based on passive sources, such as earthquakes and ambient seismic noise, are limited in resolution by the repeatability and by the spatial and temporal distribution of natural events.
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The establishment of the TSS is supported by the China National Special Fund for Earthquake Scientific Research in Public Interest (grants 2010008001 and 200808002); the Scientific Research Institutes' Basic Research and Development Operations Special Fund of the Institute of Geophysics, China Earthquake Administration (grant DQJB10A01); and the National Natural Science Foundation of China (grants 40874095 and 40730318). The authors acknowledge Daoyuan Sun and Lianxin Wen for their comments on the manuscript.