Quaternary landscape evolution in the San Jacinto fault zone, Peninsular Ranges of Southern California: Transient response to strike-slip fault initiation

Dorsey, Rebecca J.; Roering, J. J.

doi:10.1016/j.geomorph.2005.06.013

Cited by 55 publications

(62 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In general, rates vary by one order of magnitude from 1 mm/y to 10 mm/y, within the range predicted by other workers (e.g. Weissel and Seidl, 1998;Dorsey and Roering, 2006), although we note that the fastest rates of knickzone propagation are for rivers crossing the Fucino fault, which has the greatest present-day slip rate (N 1.5 mm/y where rivers FC1 and FC2 cross) and hence also the greatest degree of fault acceleration. Theoretically, knickzone retreat can also be enhanced by softer rock types, and by greater catchment discharge .…”

Section: Knickzone Migration Ratessupporting

confidence: 88%

Decoding temporal and spatial patterns of fault uplift using transient river long profiles

et al. 2008

View full text Add to dashboard Cite

We present detailed observations of rivers crossing active normal faults in the Central Apennines, Italy, where excellent constraints exist on the temporal and spatial history of fault movement. We demonstrate that rivers with drainage areas N 10 km 2 and crossing faults that have undergone an increase in throw rate within the last 1 My, have significant long-profile convexities. In contrast, channels that cross faults that have had a constant-slip rate for 3 My have concave-up profiles and have similar concavities and steepness indices to rivers that do not cross any active fault structures. This trend is consistent across the Central Apennines and cannot be explained by appeal to lithology or regional base level change. The data challenge the belief that active faulting must always be reflected in river profiles; instead, the long-profile convexities are best explained as a transient response of the river system to a change in tectonic uplift rate. Moreover, for these rivers we demonstrate that the height of the profile convexity, as measured from the fault, scales with the magnitude of the uplift rate increase on the fault; and we establish that this relationship holds for throw rate variation along strike for the same fault segment, as well as between faults. These findings are shown to be consistent with predictions of channel response to changing uplift rate rates using a detachment-limited fluvial erosion model, and they illustrate that analysis of the magnitude of profile convexities has considerable predictive potential for extracting tectonic information. We also demonstrate that the migration rate of the profile convexities varies from 1.5-10 mm/y, and is a function of the slip rate increase as well as the drainage area. This is consistent with n N 1 for the slope exponent in a classical detachment-limited stream-power erosion law, but could potentially be explained by incorporating an erosion threshold or an explicit role for sediment in enhancing erosion rates. Finally, we show that for rivers in extensional settings, where the response times to tectonic perturbation are long (in this case N 1 My), attempts to extract tectonic uplift rates from normalised steepness indices are likely to be flawed because topographic steady state has not yet been achieved.

show abstract

Section: Knickzone Migration Ratessupporting

confidence: 88%

Decoding temporal and spatial patterns of fault uplift using transient river long profiles

et al. 2008

View full text Add to dashboard Cite

show abstract

“…It is presently the most seismically active fault in southern California, with a geologic slip rate of 12-14 mm/yr (Rockwell et al, 1990) and post-Cretaceous cumulative offset of~24 km (Sharp, 1967). The SJF is a young fault, but its age is poorly constrained to 1-2.5 Ma (Matti and Morton, 1993;Dorsey and Roering, 2006). Becker et al (2005) found a strong GPS strain signal of 15 mm/yr across the fault.…”

Section: Regional Settingmentioning

confidence: 99%

“…Dorsey and Roering (2006) studied basin evolution northeast of the Clark fault, along Horse canyon and Buck ridge, and showed that as basins move through the restraining bend in Horse canyon they change their profiles from convex to concave. North of the trifurcation area, Dor et al (2006b) studied three outcrops of the fault core and described its asymmetry, as well as asymmetry in the damage of the adjacent Pleistocene sediments, and concluded that the northeast side of the fault is more damaged northwest of Anza.…”

Section: Regional Settingmentioning

confidence: 99%

Application of high resolution DEM data to detect rock damage from geomorphic signals along the central San Jacinto Fault

2009

View full text Add to dashboard Cite

“…In landscapes where channel incision outpaces hillslope response, the hillslope-channel system becomes decoupled, leading to the formation of oversteepend hillslopes and knickpoints in the channels (Dorsey and Roering, 2006;Kirby et al, 2007). On the scale of the entire watershed, knickzone migration leading to steepening hillslopes is the primary means by which changes in the base level of streams are transmitted to the upper basins (Mudd and Furbish, 2005).…”

Section: Introductionmentioning

confidence: 99%

Cosmogenic nuclide-based investigation of spatial erosion and hillslope channel coupling in the transient foreland of the Swiss Alps

Norton¹,

Blanckenburg²,

Schlunegger³

et al. 2008

Geomorphology

104

128

View full text Add to dashboard Cite

Quaternary landscape evolution in the San Jacinto fault zone, Peninsular Ranges of Southern California: Transient response to strike-slip fault initiation

Cited by 55 publications

References 67 publications

Decoding temporal and spatial patterns of fault uplift using transient river long profiles

Decoding temporal and spatial patterns of fault uplift using transient river long profiles

Application of high resolution DEM data to detect rock damage from geomorphic signals along the central San Jacinto Fault

Cosmogenic nuclide-based investigation of spatial erosion and hillslope channel coupling in the transient foreland of the Swiss Alps

Contact Info

Product

Resources

About