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Seafloor sediment thickness beneath the VoiLA broad-band ocean-bottom seismometer deployment in the Lesser Antilles from P-to-S delay times

Chichester, B.; Rychert, C.; Harmon, N.; Allen, R.; Collier, J.; Henstock, T.; Rietbrock, Andreas

Broad-band 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 backarc of the Lesser Antilles subduction zone for 15 months from 2016 to 2017. Using the amplitudes and delay times of P-to-S (Ps) scattered waves from the conversion of teleseismic earthquake Pwaves 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 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 eight OBSs. At these stations we find sediment thicknesses range from 0.43 ± 0.45 to 5.49 ± 3.23 km. To match the observations of nine other OBSs, layered sediment and variable thickness crust is required in the earth model to account for wave interference effects on the observed arrivals. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129563
Veröffentlicht am 11.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0016-8009, 0955-419X, 0956-540X, 1365-246X, 2056-5216
KITopen-ID: 1000129563
Erschienen in Geophysical journal international
Verlag Oxford University Press (OUP)
Band 223
Heft 3
Seiten 1758-1768
Schlagwörter Body waves, Wave scattering and diffraction, Backarc basin processes, Crustal structure, Sedimentary basin processes
Nachgewiesen in Web of Science
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