2022
DOI: 10.1029/2021jb022708
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Depth and Thickness of Tectonic Tremor in the Northeastern Olympic Peninsula

Abstract: Tectonic tremor has been explained as a swarm of low‐frequency earthquakes (LFEs), which are located on a narrow fault at the plate boundary. However, due to the lack of clear impulsive phases in the tremor signal, it is difficult to determine the depth of the tremor source with great precision. The thickness of the tremor region is also not well constrained. The tremor may be located on a narrow fault as the LFEs appear to be, or distributed over a few kilometers wide low shear‐wave velocity layer in the uppe… Show more

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“…In Cascadia, ETS occurs along the plate boundary above and below the continental Moho (Audet & Bürgmann, 2014; Hyndman et al., 2015). Here, the tremor source above the Moho correlates with a ∼5–10 km thick zone of low shear‐wave velocity (Calvert, 2004; Delph et al., 2021) or is located near the plate boundary zone, which is less than 2–3 km thick (Ducellier & Creager, 2022). The true nature of the low‐velocity zone (LVZ) is controversial: while the LVZ may represent the shear zone of subducting oceanic crust, it may also correspond to underplated sedimentary rocks (Calvert et al., 2011, 2020; Delph et al., 2021).…”
Section: Introductionmentioning
confidence: 99%
“…In Cascadia, ETS occurs along the plate boundary above and below the continental Moho (Audet & Bürgmann, 2014; Hyndman et al., 2015). Here, the tremor source above the Moho correlates with a ∼5–10 km thick zone of low shear‐wave velocity (Calvert, 2004; Delph et al., 2021) or is located near the plate boundary zone, which is less than 2–3 km thick (Ducellier & Creager, 2022). The true nature of the low‐velocity zone (LVZ) is controversial: while the LVZ may represent the shear zone of subducting oceanic crust, it may also correspond to underplated sedimentary rocks (Calvert et al., 2011, 2020; Delph et al., 2021).…”
Section: Introductionmentioning
confidence: 99%