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title = {{Non-volcanic tremor and low-frequency earthquake swarms}},  journal = {Nature},  }  @article{Gibbons_2006,  doi = {10.1111/j.1365-246x.2006.02865.x},  url = {http://dx.doi.org/10.1111/j.1365-246x.2006.02865.x},  year = {2006},  month = {apr},  publisher = {Oxford University Press ({OUP})},  volume = {165},  number = {1},  pages = {149--166},  author = {Steven J. Gibbons and Frode Ringdal},  title = {{The detection of low magnitude seismic events using array-based waveform correlation}},  journal = {Geophysical Journal International},  }