IISER Mohali, Knowledge city, Sector 81, SAS Nagar, Manauli PO 140306

A search for primary surface ruptures along the mountain front to characterize the recurrence behavior of the great earthquakes in the eastern Himalaya

Priyanka Singh Rao (Faculty Candidate, Assistant Professor, Department of Geology, Central University of Tamil Nadu, Thiruvarur)

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Abstract:The Himalaya is a type example of the tectonics of continental-continental convergence. The topography, geologic structure, and earthquakes of the Himalaya are a consequence of the northward progression and collision of India into Eurasia. Understanding the relationship between strain accumulation and strain release is fundamental to understand the processes of mountain building and earthquake recurrence. My research is aimed at understanding the character of strain release which is of both scientific and societal importance.
The Himalayan Frontal Thrust (HFT) is the 2500 km long fault system that marks an active southward-verging collisional boundary of the Eurasian plate with the Indian subcontinent. Large magnitude, twentieth century earthquakes, including the 1905 Kangra, 1934 Nepal-Bihar, and 1950 Assam earthquakes, and historically documented seismic events (e.g. 1255, 1344, 1505, and 1555) have likely ruptured the HFT. Defining the rupture segments and magnitudes of these earthquakes has been a challenge because of the scarcity of historical records of the events, insufficient paleoseismic data and lack of knowledge of relation between structural segmentation and rupture propagation.
Earthquakes generate tectonic landforms, such as fault scarps, along active faults that corresponds to or roughly coincide with a fault plane that has displaced the ground surface. It provides quantitative data for understanding the pattern of strain release and thus to propose recurrent time of large to great earthquake along Himalaya. To characterize the active faults, high resolution field survey integrated with different discipline of geological science (structural geology, sedimentology, river science, chronology and etc.) play central importance. In this talk, I will discuss briefly about my research outcome on aforesaid context.

Meeting ID: 968 8734 7134
Passcode: 880008
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