Nepal earthquake evidence from GNSS data at the Everest Pyramid Lab
Published:September 25, 2019
G. Poretti, F. Morsut, F. Pettenati, 2019. "Nepal earthquake evidence from GNSS data at the Everest Pyramid Lab", Crustal Architecture and Evolution of the Himalaya–Karakoram–Tibet Orogen, Rajesh Sharma, Igor M. Villa, Santosh Kumar
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The permanent GNSS station located at the Everest Pyramid Laboratory of EvK2CNR recorded its position coordinates during the earthquakes at the Gorkha (25 April 2015) and Ghorthali zones (12 May 2015) at an interval of every 30 s. The data recorded over three days prior to and after the earthquakes were analysed and the movement indicated a shifting of the GNSS station point from its original position every 30 s. From an accurate analysis of the coordinates of the station determined using GNSS Bernese software, it is possible to detect the movements of the station during the seismic events.
The shifts in the GNSS point were summed to provide an integral function (PIF, Pyramid Integral Function) that can be computed for each of the three components. Comparing them with the displacement record of the GURALP broadband seismic station (IO-EVN) of the OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Trieste), located at the Pyramid, it is possible to establish a correlation, particularly with the vertical and north components; the maxima of the PIF coincide with the time of occurrence of the earthquakes.
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Crustal Architecture and Evolution of the Himalaya–Karakoram–Tibet Orogen
CONTAINS OPEN ACCESS
This volume comprises 17 contributions that address the architecture and geodynamic evolution of the Himalaya–Karakoram–Tibet (HKT) system, covering wide aspects, from the active seismicity of the present day to the remnants of the Proterozoic orogen. The articles investigate the HKT system at different scales, blending field research with laboratory studies. The role of various lithospheric components and their inheritance in the geodynamic and magmatic evolution of the HKT system through time, and their links to global geological events, are studied in the field. The laboratory research focuses on the (sub-)micrometre scale, detailing micro-structural geology, crystal chemistry, geochronology, and the study of circulating fluids, their preservation (trapped in fluid inclusions) and their evolution, distribution, migration and interaction with the solid host. An orogen over 2000 km long can be understood only if the processes at the nanometre and micrometre scales are taken into account. The contributions in this volume successfully combine these scales to enhance our understanding of the HKT system.