Abstract
The study area falls in the mesoseismal zone of 1905 Kangra earthquake (Mw 7.8). To identify appropriate trenching site for paleoseismic investigation and to understand the faulting geometry, ground-penetrating radar (GPR) survey was conducted across a Hajipur Fault (HF2) scarp, a branching out fault of Himalayan Frontal Thrust (HFT) in a foot hill zone of NW Himalaya. Several 2D and 3D profiles were collected using 200 MHz antenna with SIR 3000 unit. A 2D GPR profile collected across the HF2 scarp revealed prominent hyperbolas and discontinuous-warped reflections, suggesting a metal pipe and a zone of deformation along a low-angle thrust fault, respectively. The 3D profile revealed remarkable variation in dip of the fault plane and pattern of deformation along the strike of the fault.
Highlights
Paleoseismology defines the study of prehistoric earthquakes, especially their location, timing, and size [1,2,3,4,5,6,7,8]
The ground-penetrating radar (GPR) survey, 2D and 3D helped us in identifying the suitable location for trenching
The 3D profiling with slicing at 1 m interval gave a complete picture of variation in deformation in terms of the geometry of the fault and related deformation along the strike of the active fault (HF2)
Summary
Paleoseismology defines the study of prehistoric earthquakes, especially their location, timing, and size [1,2,3,4,5,6,7,8]. The GPR technique has been widely used for different studies for mapping near subsurface displacements in the young Quaternary sediments related to active faulting, for identifying neotectonic faulting activity and liquefaction features like sand-blows (e.g., [10,11,12,13,14,15,16,17,18,19,20]) It has proved as an important tool in locating archeological sites (e.g., [21,22,23,24]). To identify the appropriate site for trenching and to understand the geometry of faulting, we collected 2D and 3D GPR profiles
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