Imperial College London

Prof Jenny Collier

Faculty of EngineeringDepartment of Earth Science & Engineering

Professor of Marine Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6443jenny.collier CV

 
 
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Location

 

4.46Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Chichester:2020:gji/ggaa360,
author = {Chichester, B and Rychert, C and Harmon, N and Allen, R and Collier, J and Henstock, T and Rietbrock, A},
doi = {gji/ggaa360},
journal = {Geophysical Journal International},
title = {Seafloor sediment thickness beneath the VoiLA broadband ocean-bottom seismometer deployment in the Lesser Antilles from P-to-S delay times},
url = {http://dx.doi.org/10.1093/gji/ggaa360},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - <jats:title>Summary</jats:title> <jats:p>Broadband ocean-bottom seismometer (OBS) deployments present an opportunity to investigate the seafloor sediment thickness, which is important for constraining sediment deposition, and is also useful for subsequent seismological analyses. The Volatile Recycling in the Lesser Antilles (VoiLA) project deployed 34 OBSs over the island arc, fore- and back-arc of the Lesser Antilles subduction zone for 15 months from 2016-2017. Using the amplitudes and delay times of P-to-S (Ps) scattered waves from the conversion of teleseismic earthquake P-waves at the crust-sediment boundary and pre-existing relationships developed for Cascadia, we estimate sediment thickness beneath each OBS. The delay times of the Ps phases vary from 0.20 ± 0.06 s to 3.55 ± 0.70 s, generally increasing from north to south. Using a single-sediment and single-crystalline crust Earth model in each case, we satisfactorily model the observations of 8 OBSs. At these stations we find sediment thicknesses range from 0.43 ± 0.45 km to 5.49 ± 3.23 km. To match the observations of 9 other OBSs, layered sediment and variable thickness crust is required in the Earth model to account for wave interference effects on the observed arrivals. We perform an inversion with a two-layer sediment and a single-layer crystalline crust in these locations finding overall sediment thicknesses of 1.75 km (confidence region: 1.45-2.02 km) to 7.93 km (confidence region: 6.32-11.05 km), generally thinner than the initial estimates based on the pre-existing relationships. We find agreement between our modelled velocity structure and the velocity structure determined from the VoiLA active-source seismic refraction experiment at the three common locations. Using the Ps values and estimates from the VoiLA refraction experiment, we provide an adjusted relati
AU - Chichester,B
AU - Rychert,C
AU - Harmon,N
AU - Allen,R
AU - Collier,J
AU - Henstock,T
AU - Rietbrock,A
DO - gji/ggaa360
PY - 2020///
SN - 0956-540X
TI - Seafloor sediment thickness beneath the VoiLA broadband ocean-bottom seismometer deployment in the Lesser Antilles from P-to-S delay times
T2 - Geophysical Journal International
UR - http://dx.doi.org/10.1093/gji/ggaa360
ER -