The Detection of Seismicity on Icy Ocean Worlds by Single-Station and Small-Aperture Seismometer Arrays
AffiliationLunar and Planetary Laboratory, University of Arizona
MetadataShow full item record
PublisherJohn Wiley and Sons Inc
CitationMarusiak, A. G., Schmerr, N. C., Pettit, E. C., Avenson, B., Bailey, S. H., Bray, V. J., Dahl, P., DellaGiustina, D. N., Wagner, N., & Weber, R. C. (2022). The Detection of Seismicity on Icy Ocean Worlds by Single-Station and Small-Aperture Seismometer Arrays. Earth and Space Science.
JournalEarth and Space Science
RightsCopyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractFuture missions carrying seismometer payloads to icy ocean worlds will measure global and local seismicity to determine where the ice shell is seismically active. We use two locations, a seismically active site on Gulkana Glacier, Alaska, and a more seismically quiet site on the northwestern Greenland Ice Sheet as geophysical analogs. We compare the performance of a single-station seismometer against a small-aperture seismic array to detect both high (>1 Hz) and low (<0.1 Hz) frequency events at each site. We created catalogs of high frequency (HF) and low frequency (LF) seismicity at each location using an automated short-term average/long-term average technique. We find that with a 1-m small-aperture seismic array, our detection rate increased (9% for Alaska and 46% for Greenland) over the single-station approach. At Gulkana, we recorded an order of magnitude greater HF events than the Greenland site. We ascribe the HF events sources to a combination of icequakes, rockfalls, and ice-water interactions, while very HF events are determined to result from bamboo poles that were used to secure gear. We further find that local environmental noise reduces the ability to detect LF global tectonic events. Based upon this study, we recommend that (a) future missions consider the value of the expanded capability of a small array compared to a single station, (b) design detection algorithms that can accommodate variable environmental noise, and (c) assess the potential landings sites for sources of local environmental noise that may limit detection of global events. © 2022 The Authors.
NoteOpen access journal
VersionFinal published version
Except where otherwise noted, this item's license is described as Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License.