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14 results on '"Sapkota, S. N."'

2. Slip pulse and resonance of the Kathmandu basin during the 2015 Gorkha earthquake, Nepal

Author

Galetzka, J., Melgar, D., Genrich, J. F., Geng, J., Owen, S., Lindsey, E. O., Xu, X., Bock, Y., Avouac, J.-P., Adhikari, L. B., Upreti, B. N., Pratt-Sitaula, B., Bhattarai, T. N., Sitaula, B. P., Moore, A., Hudnut, K. W., Szeliga, W., Normandeau, J., Fend, M., Flouzat, M., Bollinger, L., Shrestha, P., Koirala, B., Gautam, U., Bhatterai, M., Gupta, R., Kandel, T., Timsina, C., Sapkota, S. N., Rajaure, S., and Maharjan, N.

Published
2015

4. NATURAL HAZARDS: Slip pulse and resonance of the Kathmandu basin during the 2015 Gorkha earthquake, Nepal

Author

Galetzka, J., Melgar, D., Genrich, J. F., Geng, J., Owen, S., Lindsey, E. O., Xu, X., Bock, Y., Avouac, J.-P., Adhikari, L. B., Upreti, B. N., Pratt-Sitaula, B., Bhattarai, T. N., Sitaula, B. P., Moore, A., Hudnut, K. W., Szeliga, W., Normandeau, J., Fend, M., Flouzat, M., Bollinger, L., Shrestha, P., Koirala, B., Gautam, U., Bhatterai, M., Gupta, R., Kandel, T., Timsina, C., Sapkota, S. N., Rajaure, S., and Maharjan, N.

Published
2015
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6. Post Earthquake Aggradation Processes to Hide Surface Ruptures in Thrust Systems: The M8.3, 1934, Bihar‐Nepal Earthquake Ruptures at Charnath Khola (Eastern Nepal)

Author

Rizza, M., primary, Bollinger, L., additional, Sapkota, S. N., additional, Tapponnier, P., additional, Klinger, Y., additional, Karakaş, Ç., additional, Kali, E., additional, Etchebes, M., additional, Tiwari, D. R., additional, Siwakoti, I., additional, Bitri, A., additional, and Bes de Berc, S., additional

Published
2019
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7. Estimating the return times of great Himalayan earthquakes in eastern Nepal : evidence from the Patu and Bardibas strands of the main frontal thrust

Author

Bollinger, L., Tapponnier, Paul, Sapkota, S. N., Klinger, Y., Rizza, M., Van der Woerd, J., Tiwari, D. R., Pandey, R., Bitri, A., Bes de Berc, S., and Earth Observatory of Singapore

Subjects
Science::Geology::Volcanoes and earthquakes [DRNTU]
Abstract

The return times of large Himalayan earthquakes are poorly constrained. Despite historical devastation of cities along the mountain range, definitive links between events and specific segments of the Main Frontal Thrust (MFT) are not established, and paleoseismological records have not documented the occurrence of several similar events at the same location. In east central Nepal, however, recently discovered primary surface ruptures of that megathrust in the A.D. 1255 and 1934 earthquakes are associated with flights of tectonically uplifted terraces. We present here a refined, longer slip history of the MFT's two overlapping strands (Patu and Bardibas Thrusts) in that region, based on updated geomorphic/neotectonic mapping of active faulting, two 1.3 km long shallow seismic profiles, and logging of two river-cut cliffs, three paleoseismological trenches, and several pits, with constraints from 74 detrital charcoals and 14 cosmogenic nuclide ages. The amount of hanging wall uplift on the Patu thrust since 3650 ± 450 years requires three more events than the two aforementioned. The uplift rate (8.5 ± 1.5 mm/yr), thrust dip (25° ± 5°N), and apparent characteristic behavior imply 12–17.5 m of slip per event. On the Bardibas thrust, discrete pulses of colluvial deposition resulting from the coseismic growth of a flexural fold scarp suggest the occurrence of six or seven paleo-earthquakes in the last 4500 ± 50 years. The coeval rupture of both strands during great Himalayan earthquakes implies that in eastern Nepal, the late Holocene return times of such earthquakes probably ranged between 750 ± 140 and 870 ± 350 years. Published version

Published
2014

8. Duplex in the Main Himalayan Thrust illuminated by aftershocks of the 2015 Mw7.8 Gorkha earthquake

Author

Mendoza, M. M., Ghosh, A., Karplus, M. S., Klemperer, S. L., Sapkota, S. N., Adhikari, L. B., and Velasco, A.

Abstract

In April 2015, the lower locked portion of the Main Himalayan Thrust ruptured beneath Nepal, causing the disastrous Mw7.8 Gorkha earthquake. Elucidating the enigmatic geometry of this plate boundary fault is important for understanding the nucleation and arrest of large earthquake ruptures as well as the seismic hazard, topography and tectonics of the Himalaya. Here we interpret the geometry of the Main Himalayan Thrust from the spatial distribution and rupture patterns of a dynamic sequence of aftershocks following the Gorkha earthquake, which were recorded by a rapidly deployed dense seismic network. We find that the thrust comprises two north-dipping subhorizontal planes that are connected by a system of bounded imbricate thrust faults; this structure is known as a duplex. We propose that this duplex acts as an impediment to plate convergence and accommodates tectonic stress along its complex system of faults. Such a prominent structure to the Main Himalayan Thrust is consistent with surface geological studies but challenges geophysically derived conventional models with simpler geometries.

Published
2019
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