Geophysical lineaments of Western Ghats and adjoining coastal areas of central Kerala, southern India and their temporal development

Ajayakumar, P.; Rajendran, Suresh; Mahadevan, Telliyavaram Mahadevan Ponnambalam

doi:10.1016/j.gsf.2016.11.005

Cited by 13 publications

(3 citation statements)

References 29 publications

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“…Most fold scarps correlate with geophysical lineaments that are oriented perpendicular to the average orientation of SHmax, supporting the hypothesis that intraplate seismicity is largely controlled by pre-existing crustal structures that are optimally oriented and reactivated under prevailing stress fields (e.g. Ajayakumar et al, 2017;Dentith et al, 2009;King et al, 2019;Reilly et al, 2017;Sibson, 1985Sibson, , 1995Yang et al, 2021) (Figures 1b and 6). The locations and slip rates of Nullarbor faults are also influenced by spatial variations in the distributions of lithospheric fluids (Yang et al, 2022).…”

Section: Discussionsupporting

confidence: 68%

Fault geometry and slip rates from the Nullarbor and Roe Plains of south‐central Australia: Insights into the spatial and temporal characteristics of intraplate seismicity

Sellmann

Quigley

Duffy

et al. 2022

Earth Surf Processes Landf

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Analysis of TanDEM-X and Shuttle Radar Topography Mission (SRTM) data reveals geomorphic evidence for 292 fault-propagation fold scarps across the Miocene Nullarbor and Pliocene Roe Plains in south-central Australia. Vertical displacements (VD) are determined using topographic profiling of a subset (n = 48) of the fold traces. Fault dips (mean = 44 +16/À14 at 1σ) are estimated from seismic reflection data; the mean dip is assigned to faults with unknown dip and combined with VD to estimate net displacements (ND) and average net displacements (AD) for each fault. AD exceeds single-event displacements estimated from fault-length scaling regressions, indicating the identified faults have hosted multiple earthquakes. Combining AD with (i) faulted surface ages (Nullarbor $10-5 Ma, Roe $2.5 Ma), (ii) ages of faulted erosional-depositional features (e.g. relic Late Miocene dune fields and Pliocene paleochannels), and (iii) onset of the neotectonic regime in Australia at $10 Ma yields average slip rates from <0.1 m Myr À1 to >17 m Myr À1 (mean = 1.1 m Myr À1 ). Summation of displacements across faults yields crustal horizontal shortening rates lower than geodetically detectable resolution (≤0.01 mm yr À1 ) since the Late Miocene. The ca. 10 Myr-long record of neotectonic faulting on the Nullarbor Plain provides important insights into earthquake spatial-temporal behaviours in a slowly deforming intraplate continental region.

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Section: Discussionsupporting

confidence: 68%

Fault geometry and slip rates from the Nullarbor and Roe Plains of south‐central Australia: Insights into the spatial and temporal characteristics of intraplate seismicity

Sellmann

Quigley

Duffy

et al. 2022

Earth Surf Processes Landf

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show abstract

“…During the Late Mesozoic the region experienced thermal regime associated with the breakup of Gondwana resulted pericratonic continental fracturing and emplacement of basaltic dykes in three major episodes (∼ 145 Ma, ∼ 90 − 85 Ma and ∼ 70 − 65 Ma), which made different stage of west coast evolution [Ajayakumar et al, 2017;Karunakaran and Mahadevan, 1971;Radhakrishna, 1999]. The KK Basin, located on the continental shelf part has evolved by separation of continental masses from western margin of India and suggest it as an oceanic crust between LCR and KK shelf [Das, 2013].…”

Section: Study Area and Regional Geologymentioning

confidence: 99%

“…Furthermore, most rivers in the central part of Kerala show highly sinuous nature and asymmetric basin characteristics which indirectly point towards the planform changes of the river and watershed as a whole in response to the neotectonic activities in KKPT. Recent studies indicate that, minor tremors are occurring with KKPT, suggesting a significant tectonic activity [Ajayakumar et al, 2017;Dhanya and Renoy, 2015; Girish Gopinath et al, 2016;Rajendran and Rajendran, 1996]. …”

Section: Zone IImentioning

confidence: 99%