Acknowledgments
We thank Eileen Martin, Zi Xian Leong and Sam Hone for proofreading the
article. We thank Chris Marone for his warm support to convince the Penn
State Institute of Natural Gas Research to provide seed money to the DAS
fiber array. We thank Todd Myers, Ken Miller at Penn State University,
Thomas Coleman from Silixa Inc. who help setup the fiber-optic DAS
array. The DAS array was supported by Penn State Institute of
Environment and Energy seed grant and Institute of Natural Gas Research.