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Segmentation of the Himalayas as revealed by arc-parallel gravity anomalies
Hetényi, G [Hetényi, György (geofizikus), szerző]
;
Cattin, R
;
Berthet, T
;
Le Moigne, N
;
Chophel, J
;
Lechmann, S
;
Hammer, P
;
Drukpa, D
;
Sapkota, SN
;
Gautier, S
;
Thinley, K
Angol nyelvű Szakcikk (Folyóiratcikk) Tudományos
Megjelent:
SCIENTIFIC REPORTS 2045-2322 2045-2322
6
Paper: 33866
2016
Szociológiai Tudományos Bizottság: B nemzetközi
SJR Scopus - Multidisciplinary: D1
Azonosítók
MTMT: 3163088
DOI:
10.1038/srep33866
WoS:
000383577600001
Scopus:
84988564468
PubMed:
27649782
Szakterületek:
Egyéb természettudományok
Lateral variations along the Himalayan arc are suggested by an increasing number of studies and carry important information about the orogen's segmentation. Here we compile the hitherto most complete land gravity dataset in the region which enables the currently highest resolution plausible analysis. To study lateral variations in collisional structure we compute arc-parallel gravity anomalies (APaGA) by subtracting the average arc-perpendicular profile from our dataset; we compute likewise for topography (APaTA). We find no direct correlation between APaGA, APaTA and background seismicity, as suggested in oceanic subduction context. In the Himalayas APaTA mainly reflect relief and erosional effects, whereas APaGA reflect the deep structure of the orogen with clear lateral boundaries. Four segments are outlined and have disparate flexural geometry: NE India, Bhutan, Nepal &India until Dehradun, and NW India. The segment boundaries in the India plate are related to inherited structures, and the boundaries of the Shillong block are highlighted by seismic activity. We find that large earthquakes of the past millennium do not propagate across the segment boundaries defined by APaGA, therefore these seem to set limits for potential rupture of megathrust earthquakes. © The Author(s) 2016.
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