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Jayangondaperumal, R.
- 8 October, 2005 Muzaffarabad Earthquake and Seismic Hazard Assessment of Kashmir Gap in Northwestern Himalaya
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
2 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001
3 Indian Institute of Remote Sensing, Dehra Dun - 248 001, IN
4 Kashmir University Srinagar - 190 006, IN
5 Jammu University, Jammu - 180 006, IN
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
2 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001
3 Indian Institute of Remote Sensing, Dehra Dun - 248 001, IN
4 Kashmir University Srinagar - 190 006, IN
5 Jammu University, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 2 (2006), Pagination: 187-200Abstract
The 8 October 2005 Muzaffarabad earthquake was the deadhest earthquake In the history of Indian subcontinent Its epicenter located 10 km northeast of Muzaffarabad lies in the lndus Kohistan Seismic Zone (IKSZ), which represents northwestern continuation of the microseismicity and moderate earthquakes belt of Garhwal, Kumaun and Nepal A multi-institution team undertook post earthquake studies along the LOC and adjoining areas in Tangdhar, Un and Poonch sectors of Kashmir, India The Tangdhar area lying on the hanging wall and the Un area close to the rupture zone have suffered much more damage In comparision to the Poonch region located on the footwall An isoseismal map of the earthquake affected region has been prepared on the basis of our observations and website data The opened-up cracks and lateral spreads mapped In the Tangdhar and Un reglonishow both right-lateral as well as left-lateral strike-slip and vertical motions of a few cm to 30 cm The Mw 7 6 Muzaffarabad earthquake has ruptured a segment -80 km x 50 km west of the closure of Kashrmr Valley An earlier mapped active fault of en echelon nature, trending NW-SE and extending from Balakot to Muzaffarabad and further southeast along the eastern bank of river Jhelum, coincldes with linear trend of the aftershocks belt and the rupture plane of the earthquake The knowledge gamed through ths earthquake implies that a selismic gap of a similar size of unruptured segment that lies between the 1555 Kashmir (Mw 7 5) and 1905 Kangra (Mw 7 8) earthquakes, where there is no historical record of a large earthquake for more than 500 years, may be ripe for a large event.Keywords
Himalayan Seismicity, kashmir Earthquakes, Earthquake Hazard, Active Faults.
- Structural and Magnetic Fabric Studies of Recess Structures in the Western Himalaya: Implications for 1905 Kangra Earthquake
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 225-238Abstract
Kinematic information from deformation structures and magnetic fabrics are used to infer recent tectonics around Kangra and Dehradun recesses, western Himalaya. Three types of magnetic fabrics (Type I&II, III, and IV) are identified based on the angle between K3 axis and bedding pole. It was observed that Kangra recess shows more mature fabric type IV as compared to Dehradun recess, where orientation of K3 axes and tectonic fabric reveals dominance of superposed deformation. In the vicinity of Dehradun recess, normal faults occur in un-indurated Quaternary fan deposits confirming their recent formation. The observations are in conformity with earlier studies that during the 1905 Kangra earthquake, the Main Boundary Thrust (MBT) (or one of its subsidiary thrusts) near Kangra showed thrusting whereas the MBT near Dehradun underwent either normal faulting or post seismic adjustments characteristic of normal faulting. The thrusting could be a result of subsurface processes whereas the normal faulting was a result of prevailing surface strains.Keywords
Anisotropy of Magnetic Susceptibility, Himalayan Seismicity, Magnetic Fabric Type, Superimposed Deformation.References
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