A5068663349- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Seismic Waves and Analysis
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Seismology and Earthquake Studies
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Marine and environmental studies
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geotechnical and Geomechanical Engineering
- Geology and Paleoclimatology Research
- Geological Formations and Processes Exploration
- Reservoir Engineering and Simulation Methods
- Geological formations and processes
- Geological and Tectonic Studies in Latin America
- Methane Hydrates and Related Phenomena
- Drilling and Well Engineering
- Geophysical and Geoelectrical Methods
- Pelvic and Acetabular Injuries
- Geomechanics and Mining Engineering
- Geophysics and Sensor Technology
GFZ Helmholtz Centre for Geosciences
2014-2025
National Geophysical Research Institute
2012
Predict (France)
2012
Karlsruhe Institute of Technology
1987-1997
Earth Science Institute of the Slovak Academy of Sciences
1988
INDEPTH geophysical and geological observations imply that a partially molten midcrustal layer exists beneath southern Tibet. This has been produced by crustal thickening behaves as fluid on the time scale of Himalayan deformation. It is confined south structurally imbricated Indian crust underlying Tethyan High Himalaya underlain, apparently, stiff mantle lid. The results suggest during Neogene underthrusting acted plunger, displacing middle to north while at same contributing this melting...
Seismic data from central Tibet have been combined to image the subsurface structure and understand evolution of collision India Eurasia. The 410- 660-kilometer mantle discontinuities are sharply defined, implying a lack subducting slab beneath plateau. appear slightly deeper northern Tibet, that average temperature above transition zone is about 300 degrees C hotter in north than south. There prominent south-dipping converter uppermost might represent top Eurasian lithosphere underthrusting margin
Fifteen seismic stations were operated with about 20‐km spacing in southern Tibet across the Zangbo suture (the collision zone between India and Asia) May October 1994 as part of International Deep Profiling Himalaya project (INDEPTH II) for wide‐angle recording controlled source experiment passive earthquake recording. In addition, a dense deployment (4‐km spacing) within German Depth Himalayas (GEDEPTH) also recorded number teleseismic earthquakes. The third data used this study is records...
SKS and SKKS shear waves recorded on the INDEPTH III seismic array deployed in central Tibet during 1998–1999 have been analyzed for direction extent of polarization anisotropy. The 400‐km‐long NNW trending extended south to north, from Lhasa terrane, across Karakoram‐Jiali fault system Banggong‐Nujiang suture Qiangtang terrane. Substantial splitting with delay times 1 2 s, fast directions varying E‐W NE‐SW, was observed stations terrane northernmost No detectable located farther change wave...
We present new seismicity images based on a two‐year seismic deployment in the Pamir and SW Tien Shan. A total of 9532 earthquakes were detected, located, rigorously assessed multistage automatic procedure utilizing state‐of‐the‐art picking algorithms, waveform cross‐correlation, multi‐event relocation. The obtained catalog provides information crustal reveals geometry internal structure Pamir‐Hindu Kush intermediate‐depth zone with improved detail resolution. relocated clearly defines at...
Abstract Based on a 2 year seismic record from local network, we characterize the deformation of seismogenic crust Pamir in northwestern part India‐Asia collision zone. We located more than 6000 upper crustal earthquakes regional 3‐D velocity model. For 132 these events, determined source mechanisms, mostly through full waveform moment tensor inversion locally and regionally recorded seismograms. also produced new comprehensive neotectonic map Pamir, which relate to deformation. Along...
[1] The International Deep Profiling of Tibet and the Himalaya Phase IV (INDEPTH IV) active source seismic profile in northeast extends 270 km roughly north-south across Songpan-Ganzi terrane, predominantly strike-slip North Kunlun Fault (along suture), East Mountains, south Qaidam Basin. Refraction, reflection, gravity modeling provide constraints on velocity density structure down to Moho. central Basin resembles average continental crust, whereas terrane Mountains exhibit thickened,...
In the summer of 1998, project INDEPTH recorded a 400 km long NNW–SSE wide-angle seismic profile in central Tibet, from Lhasa terrane across Banggong-Nujiang suture (BNS) at about 89.5°E and into Qiangtang terrane. Analysis P-wave data reveals that (1) crustal thickness is 65 ± 5 beneath line; (2) there no 20 step Moho vicinity BNS, as has been suggested to exist along-strike east based on prior fan profiling; (3) thick high-velocity lower layer evident along length (20–35 thick, 6.5–7.3...
During the summer of 1998, active‐source seismic data were collected along a transect running 400 km NNW‐SSE across central Tibetan Plateau as third phase project INDEPTH (International Deep Profiling Tibet and Himalaya). The extends northward from Lhasa block, Jurassic Bangong‐Nujiang Suture (BNS) at 89.5°E, to Qiangtang block. A velocity model for ∼25 depth produced by inversion P wave first arrivals on ∼3000 traces shows (1) ∼50‐km‐wide region low (at least 5% less than surrounding...
To address one of the central questions plate tectonics—How do large transform systems work and what are their typical features?—seismic investigations across Dead Sea Transform (DST), boundary between African Arabian plates in Middle East, were conducted for first time. A major component these was a combined reflection/refraction survey territories Palestine, Israel Jordan. The main results this study are: (1) seismic basement is offset by 3–5 km under DST, (2) DST cuts through entire...
Abstract The Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir‐Tibet Plateau by extreme crustal shortening. Here we study structure of Pamir western Tian Shan, adjacent margins Tajik, Tarim, Ferghana Basins, Hindu Kush, using data collected temporary seismic experiments. We derive, compare, combine independent observations from P S receiver functions. obtained Moho depth varies ~40 km below basins to a double‐normal thickness 65–75 underneath Kush. A...
Abstract Break-off of part the down-going plate during continental collision occurs due to tensile stresses built-up between deep and shallow slab, for which buoyancy is increased because continental-crust subduction. governs subsequent orogenic evolution but real-time observations are rare as it happens over geologically short times. Here we present a finite-frequency tomography, based on jointly inverted local remote earthquakes, Hindu Kush in Afghanistan, where slab break-off ongoing. We...
Research Article| July 01, 2004 Precise temperature estimation in the Tibetan crust from seismic detection of α-β quartz transition J. Mechie; Mechie 1GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Germany Search for other works by this author on: GSW Google Scholar S.V. Sobolev; Sobolev 2GeoForschungsZentrum Germany, and Institute Physics Earth, Moscow, Russia L. Ratschbacher; Ratschbacher 3Institut für Geologie, Technische Universität Freiberg, 09599 A. Y. Babeyko; Babeyko...
Research Article| May 01, 2012 USArray Receiver Function Images of the Lithosphere-Asthenosphere Boundary Prakash Kumar; Kumar National Geophysical Institute (CSIR) Seismological Division Cyber Building, Uppal Road Hyderabad-500007, Indiaprakashk@ngri.res.in (P. K.) 1Deutsches GeoForschungsZentrum (GFZ), Potsdam, Germany 2National (CSIR), Hyderabad, India Search for other works by this author on: GSW Google Scholar Rainer Kind; Kind 3Freie Universität, Institut für Geologische...
Fault zones are the locations where motion of tectonic plates, often associated with earthquakes, is accommodated. Despite a rapid increase in understanding faults last decades, our knowledge their geometry, petrophysical properties, and controlling processes remains incomplete. The central questions addressed here study Dead Sea Transform (DST) Middle East as follows: (1) What structure kinematics large fault zone? (2) controls its kinematics? (3) How does DST compare to other plate...
Abstract. We present three-dimensional (3-D) models that describe the present-day thermal and rheological state of lithosphere greater Kenya rift region aiming at a better understanding evolution, with particular focus on plume–lithosphere interactions. The key methodology applied is 3-D integration diverse geological geophysical observations using gravity modelling. Accordingly, resulting lithospheric-scale density model consistent (i) reviewed descriptions lithological variations in...