Regional variations in tectonic geomorphology along a segmented convergent plate boundary pacific coast of Costa Rica

Wells, S. G.; Bullard, Thomas F.; Menges, Christopher M.; Drake, Phillip; Karas, P.A.; Kelson, Keith I.; Ritter, John B.; Wesling, J.R.

doi:10.1016/0169-555x(88)90016-5

Cited by 214 publications

(159 citation statements)

References 9 publications

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“…The amount of Smf index (Eq. 1) which indicates the intensity of tectonic activity, along a section with 12 Km in length (L-L´) was calculated to be 1.2 represents a region with high structural activity (Wells et al, 1998;Malik and Mohanty, 2007). Generally, the mountain front curving pattern, formed fractures and faults, and geologic features such as triangular facets, V-shaped valleys, alluvial canals and stream systems all confirm that the area is tectonically intensely active.…”

Section: Discussionmentioning

confidence: 97%

A Study of Stream Sediments from Soltan Meydan Basaltic Formation Area, Northern Iran

Gahruei¹,

Gholami²,

Dehkordi³

2013

International Journal of Geography and Geology

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Section: Discussionmentioning

confidence: 97%

A Study of Stream Sediments from Soltan Meydan Basaltic Formation Area, Northern Iran

Gahruei¹,

Gholami²,

Dehkordi³

2013

International Journal of Geography and Geology

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“…The morphology of small to medium sized channels and valleys that cross mountain fronts may reflect the impact of local base-level changes due to relative uplift along active structures associated with frontal escarpments (Wells et al, 1988;Ramirez-Herrera, 1998). This study uses a ratio analysis of the base width and height of Reflect a balance between the tendency of stream and slope processes to produce irregular (sinuous) mountain front and vertical active tectonics that tend to produce a prominent straight front (Keller, 1986 Bifurcation ratio is a ratio between a number of total segments in an order with the higher order.…”

Section: Facetmentioning

confidence: 99%

“…Nevertheless, both small and large facets occur in tectonically active areas (Wells et al, 1988). More tectonically active mountain fronts tend to be less dissected, giving a range from laterally continuous undissected escarpments to a nearly continuous front with only a few large and distinct facets with minimal internal dissection (Wells et al, 1988). In this study, the proportion of faceting along mountain fronts was applied using this formula: where:…”

Section: Facetmentioning

confidence: 99%

“…• Lf is the cumulative length of the triangular facets on a mountain face; • Ls is the overall length of the face of the mountains pulled straight (Wells et al, 1988;Ramirez-Herrera, 1998). …”

Section: Facetmentioning

confidence: 99%

“…Eight major study areas comprising mountain fronts and the fluvial system are applied in this morphometric analysis, such as: mountain fronts sinuousity (Smf), facets, valley floor width and valley height ratio (Vf), drainage basin shape (Bs), bifurcation ratio (Rb) and drainage density (Dd), Hypsometric (HI) and Stream Length and Gradient Index (SL) developed by Strahler (1952), Bull and McFadden (1977), Wells et al (1988), Ramirez-Herrera (1998), Soewarno (1991), and Keller and Pinter (1996) (Table 1). Owing to the large size of the studied area, sampling for some morphometric indices is applied, such as proportional facet.…”

Section: J O Gmentioning

confidence: 99%

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Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia

Yudhicara¹,

Muslim

Sudradjat

2017

Indonesian J. Geosci.

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-The study discusses about characteristics of Sumatra Fault and its tectonic activity in Liwa and the adjacent area. The research uses quantitative methods of verification hypothetical deduction, which starts from the general approach, then it pursues into more specialized and focused ones. While the research work includes field measurements, remote sensing with GIS, and geomorphologic analysis using morphometry, such as: sinousity of mountain front (Smf), percentage of facets, ratio of the width and height of the valley (Vf), bifurcation ratios of the river (Rb), drainage density (Dd), shape of the watershed basin area (Bs), hypsometric curves (HI), and gradient index of stream length (SL). Basically, two blocks separated by the Sumatra Fault do not have a significant difference in tectonic activity, but the tectonic activity change can be seen when the studied area is divided into three blocks (northwest, middle, and southeast), then the change in each part can clearly be seen. Apparently, the tectonic activity in the studied area starts from the southeast continues toward the northwest. It is proved by this research, that geomorphological parameters which are associated with mountain fronts and watershed systems demonstrate the value of the activity increases towards the northwest. Hypsometric curves and a river analysis show that the tectonic activity in the northwest is relatively in a young stage, while towards the southeast it is getting in a mature stage.

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Geomorphic assessment of active tectonics in the Acambay graben, Mexican Volcanic Belt

Ramírez‐Herrera

1998

Earth Surf. Process. Landforms

236

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Spatial variations of Quaternary deformation and tectonic activity of faults along the Acambay graben are assessed using geomorphic and morphometric approaches. The Acambay graben is an east-west trending structure of apparent Quaternary age, located in the central part of the Mexican Volcanic Belt, which gives rise to pronounced scarps over a distance of about 80 km. Continuing tectonic activity in the Acambay graben is confirmed by recent well documented seismic episodes.The intensity of active tectonics has been interpreted through a detailed geomorphic study of the fault-generated mountain fronts and fluvial systems. The combined geomorphic and morphometric data provide evidence for relative variations in tectonic activity among the Acambay graben faults. Geomorphic indices suggest a relatively high degree of tectonic activity along the Venta de Bravo and the Acambay-Tixmadeje faults, followed, in order of decreasing activity, by the Pastores, Temascalcingo and Tepuxtepec faults. Spatial variations within faults have also been identified, suggesting a higher level of tectonic activity at the tips of the faults. This pattern of variation in the relative degree of tectonic activity is consistent with field evidence and seismic data for the Acambay graben. Geomorphic evaluation of the Acambay graben faults suggests that the Acambay-Tixmadeje and Venta de Bravo faults, and specifically the tips of these faults and a central segment near the town of Venta de Bravo, should be considered as areas of potentially high earthquake risk.

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Regional variations in tectonic geomorphology along a segmented convergent plate boundary pacific coast of Costa Rica

Cited by 214 publications

References 9 publications

A Study of Stream Sediments from Soltan Meydan Basaltic Formation Area, Northern Iran

A Study of Stream Sediments from Soltan Meydan Basaltic Formation Area, Northern Iran

Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia

Geomorphic assessment of active tectonics in the Acambay graben, Mexican Volcanic Belt

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