@article {chaudhuri_widespread_2022,
	title = {Widespread Very Low Frequency Earthquakes (VLFEs) Activity Offshore Cascadia},
	journal = {Geophysical Research Letters},
	volume = {49},
	number = {13},
	year = {2022},
	note = {_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1029/2022GL097962},
	pages = {e2022GL097962},
	abstract = {A significant amount of stress in the Cascadia subduction zone (CSZ) is released by different forms of slow earthquakes including tremors, low-frequency earthquakes, and very low-frequency earthquakes (VLFEs){\textemdash}all occurring onshore at the deeper part of the transition zone. Their activity offshore, however, remains elusive. We discover widespread occurrence of discrete VLFEs offshore Cascadia using ocean-bottom seismometers. Barring occasional regular fast earthquakes, VLFEs are the only seismic stress indicators offshore. Using centroid moment tensor inversion and matched filtering, we detect sequences of 12 distinct families of VLFEs. The VLFEs in northern CSZ have focal mechanisms consistent with the area{\textquoteright}s subduction zone deformation. Interestingly, the VLFEs in the southern part of CSZ show strike-slip faulting, attributed to offshore faults, sediment consolidation, subduction bending, and transpressional regimes created by complex plate tectonics. It challenges a canonical view of the seismogenic zone in Cascadia characterized by a frictionally homogeneous fault segment producing only regular fast earthquakes.},
	issn = {1944-8007},
	doi = {10.1029/2022GL097962},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1029/2022GL097962},
	author = {Chaudhuri, Kuntal and Ghosh, Abhijit}
}
@article {Cai2018,
	title = {Water input into the Mariana subduction zone estimated from ocean-bottom seismic data},
	journal = {Nature},
	volume = {563},
	number = {7731},
	year = {2018},
	month = {nov},
	pages = {389{\textendash}392},
	issn = {0028-0836},
	doi = {10.1038/s41586-018-0655-4},
	url = {http://www.nature.com/articles/s41586-018-0655-4},
	author = {Cai, Chen and Wiens, Douglas A. and Shen, Weisen and Eimer, Melody}
}
@article {bostock_wavefield_2012,
	title = {Wave-Field Decomposition of Ocean Bottom Seismograms},
	journal = {Bulletin of the Seismological Society of America},
	volume = {102},
	number = {4},
	year = {2012},
	month = {aug},
	pages = {1681{\textendash}1692},
	abstract = {Seismograms recorded on the seafloor are affected by reverberations in the overlying ocean layer. We examine the feasibility of removing these reverberations through a 1D wave-field decomposition based on a reflection{\textendash}transmission formulation of the problem. Two decomposition schemes are presented. The first scheme involves a simple manipulation of the fundamental matrix relating stress and displacement of plane harmonic waves to upgoing and downgoing wavevector coefficients and requires measurement of both ocean bottom displacement and pressure. The second approach involves only displacement recordings and knowledge of the water column depth. This latter quantity will generally be known a priori from deployment logs, or, alternatively, it may be estimated using vertical displacement and pressure seismograms in a preprocessing step. Both approaches require prior information on seabed properties. In the case of P-wave incidence, the decomposition depends primarily on the seabed S velocity β0. This quantity can be determined by examining trial decompositions over a range of β0{\textquoteright}s and selecting the value that minimizes the energy of the upgoing S-wave component at the arrival time of the incident wave. We apply this approach to synthetic seismograms for a simple Earth structure and to recordings of two large events from the Central Oregon Locked Zone Array (COLZA) on the continental margin of Oregon. The real data indicate that the wave-field decompositions are largely successful at lower frequencies (\&lt;0.1  Hz) but that 3D scattering, likely originating near the sediment{\textendash}basement contact, is manifested at higher frequencies.},
	issn = {0037-1106},
	doi = {10.1785/0120110162},
	url = {https://doi.org/10.1785/0120110162},
	author = {Bostock, M. G. and Trehu, A. M.}
}
