Contemporary vertical crustal deformation in Cascadia

Verdonck, David

doi:10.1016/j.tecto.2006.01.006

Cited by 28 publications

(30 citation statements)

References 11 publications

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“…Additionally, the corrected errors in the South Beach and Astoria tidal records, the exclusion of the biased 1941 leveling data, and the correction of the 1988 leveling error between Charleston and South Beach all make the tidal and leveling data sets more consistent with one another. As a result of the greater rate of sea level rise and corrected South Beach tidal record, we infer that no portion of the Oregon Coast Range is currently undergoing regional‐scale subsidence, as suggested previously [ Mitchell et al , 1994; Verdonck , 2006]. This is more consistent with models of subduction zone locking constrained with horizontal GPS velocities, which predict positive uplift rates well into the Coast Range, and even the Willamette Valley (Figure 1) [ Wang et al , 2003; McCaffrey et al , 2007].…”

Section: Spatial Pattern Of Vertical Velocitysupporting

confidence: 85%

“…South from the central Oregon minimum, mean subsidence estimates increase to greater values in the vicinity of Coos Bay (Charleston) and Cape Blanco [ Leonard et al , 2004]. The low, but positive interseismic uplift rates we observe along the central Oregon coast resolve the mismatch between previous estimates of interseismic subsidence and paleoseismic signs of coseismic subsidence in this area [ Mitchell et al , 1994; Verdonck , 2006].…”

Section: Cascadia Subduction Zone Lockingmentioning

confidence: 75%

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Interseismic uplift rates for western Oregon and along‐strike variation in locking on the Cascadia subduction zone

2009

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[1] We quantify the spatial pattern of uplift rate in western Oregon and northernmost California using tidal and leveling records to better understand the pattern of interseismic locking on the Cascadia subduction zone. We extend relative sea level time series of the six primary NOAA tide gauges to include all observations from 1925 to 2006. Previously unidentified bench mark instability biases portions of tidal records by 1.6 mm a À1 before correction. We determine precise relative uplift rates at the six tidal sites with an adjustment that includes rates of differenced time series as additional constraints. Our analysis of National Geodetic Survey leveling data between tide gauges corrects errors in 1941 leveling, and 184 secondary ties double the number of highest quality uplift rate estimates. Relative uplift rates from leveling are adjusted to the tidal rates, accounting for uncertainties in both data types. Tidal and leveling uplift rates agree within error for all but one of the coastal segments, where we infer systematic leveling error affects the 1988 line. Uplift rates are made absolute using an interval and location-specific geocentric sea level rise rate of 2.3 ± 0.2 mm a À1 . Total propagated one sigma errors for the absolute uplift rates of bench marks are $0.4 mm a À1 . Along-strike changes in uplift rate near 45°N and 42.8°N require two distinct changes in locking depth, as inferred from elastic dislocation modeling. The along-strike changes in locking on this portion of the Cascadia subduction zone interface correlate to the western and southern extent of the mafic Siletzia block in the fore arc.

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Section: Spatial Pattern Of Vertical Velocitysupporting

confidence: 85%

Section: Cascadia Subduction Zone Lockingmentioning

confidence: 75%

Interseismic uplift rates for western Oregon and along‐strike variation in locking on the Cascadia subduction zone

2009

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“…7). This agrees well with the results of Verdonck (2006), who computed an estimated rate of land movement of 4.0 ± 0.1 mm yr −1 . In his estimate, he subtracts a mean eustatic sea level rise 2.0 mm yr −1 from the trend calculated from the tide gauge data (−2.0 mm yr −1 ).…”

Section: Plate Tectonics: Neah Bay (Neah) Canadasupporting

confidence: 92%

“…6). This is in accordance with the results obtained by Verdonck (Verdonck, 2006), who arrives at a 4.0 ± 0.1 mm/yr trend through the analysis of 220 tide gauge data. Sea level from altimetry yields a trend of standard deviation of solution residuals weighted average is shown in Fig.…”

supporting

confidence: 93%

Reprocessed height time series for GPS stations

et al. 2013

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Abstract. Precise weekly positions of 403 Global Positioning System (GPS) stations located worldwide are obtained by reprocessing GPS data of these stations for the time span from 4 January 1998 until 29 December 2007. The processing algorithms and models used as well as the solution and results obtained are presented. Vertical velocities of 266 GPS stations having a tracking history longer than 2.5 yr are computed; 107 of them are GPS stations located at tide gauges (TIGA observing stations). The vertical velocities calculated in this study are compared with the estimates from the co-located tide gauges and other GPS solutions. The formal errors of the estimated vertical velocities are 0.01-0.80 mm yr −1 . The vertical velocities of our solution agree within 1 mm yr −1 with those of the recent solutions (ULR5 and ULR3) of the Université de La Rochelle for about 67-75 per cent of the common stations. Examples of typical behaviour of station height changes are given and interpreted. The derived height time series and vertical motions of continuous GPS at tide gauges stations can be used for correcting the vertical land motion in tide gauge records of sea level changes.

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“…Historical records in eastern Puget Sound show more variability. Using almost 100 years of tide gauge records, Holdahl et al (1989) interpreted 1-2-mm submergence a year near Gorst, yet Verdonck (2006) found no evidence for submergence also using tide gauges. Compiling a variety of geologic records, Shipman (1989) predicted submersion of 1 mm=yr in the area around Gorst.…”

Section: Puget Lowland Quaternary Historymentioning

confidence: 99%

The A.D. 900-930 Seattle-Fault-Zone Earthquake with a Wider Coseismic Rupture Patch and Postseismic Submergence: Inferences from New Sedimentary Evidence

Arcos¹

2012

Bulletin of the Seismological Society of America

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Stratigraphic evidence for coseismic uplift, a tsunami, and a sandy debris flow linked to the A.D. 900-930 Seattle-fault-zone earthquake and subsequent submergence is present at Gorst at the terminus of Sinclair Inlet, Washington. This study indicates that at least 3 m of uplift preceded a tsunami followed by a sandy debris flow. Though the Seattle and Tacoma fault zones ruptured within the error of ages of the tsunami deposit, model simulations indicate the Seattle fault generates an order of magnitude larger tsunami in the vicinity of the field area than the Tacoma fault and is the more likely generator of the tsunami. Simulations indicate amplitude from a Seattle-fault-zone-generated wave train was 4-5 m, and stratigraphy shows the tsunami left a sandy deposit. Soft-sediment deformation narrows the time window for the debris flow to the hours to months after the tsunami. Slope failure in unconsolidated glacial sands likely initiated a debris flow that surged at least 2 km down Gorst Creek valley and left a more than 40-cm-thick deposit along the creek and in the wetlands. Submergence of a Thuja plicata (western red cedar) swamp into the intertidal zone indicates at least 1.5 m of submergence in the last 1100 years. This submergence indicates uplift on nearby marine terraces associated with the Seattle fault zone was likely higher, and the A.D. 900-930 earthquake was potentially larger, than previously recognized.

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Contemporary vertical crustal deformation in Cascadia

Cited by 28 publications

References 11 publications

Interseismic uplift rates for western Oregon and along‐strike variation in locking on the Cascadia subduction zone

Interseismic uplift rates for western Oregon and along‐strike variation in locking on the Cascadia subduction zone

Reprocessed height time series for GPS stations

The A.D. 900-930 Seattle-Fault-Zone Earthquake with a Wider Coseismic Rupture Patch and Postseismic Submergence: Inferences from New Sedimentary Evidence

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