A5026487292- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Cryospheric studies and observations
- Geological and Geochemical Analysis
- Geological Formations and Processes Exploration
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Geological and Tectonic Studies in Latin America
Freie Universität Berlin
2020-2023
GFZ Helmholtz Centre for Geosciences
2019-2023
Victoria University of Wellington
2017-2019
Seismic observations are usually inverted for seismic velocity structure (Vp and Vs). By using Markov-chain Monte Carlo (McMC) inversion (i.e. solving the forward model comparing it to data many times exploring virtual space of possible solutions), is directly invert rock type as a categorical variable (rather than its constituent minerals parameters). McMC also manages any non-linear relationships that constituents parameters may have with could result in non-convergence linear...
Abstract. We use seismic waveform data from the AlpArray Seismic Network and three other temporary networks, to perform receiver function (RF) calculations time-to-depth migration update knowledge of Moho discontinuity beneath broader European Alps. In particular, we set up a homogeneous processing scheme compute RFs using time-domain iterative deconvolution method apply consistent quality control yield 112 205 high-quality RFs. then in newly implemented 3D spherical coordinate system...
SUMMARY We investigate the relation between geothermal field production and fracture density orientation in Ngatamariki Rotokawa fields, located Taupo Volcanic Zone, New Zealand using shear wave splitting (SWS). determine SWS parameters for 17 702 microseismic events across 38 stations spanning close to 4 yr from 2012 2015. compare strength of anisotropy changes injection. also situ regional measurements maximum horizontal stress orientation. ($S_{\mathrm{ H}_{\mathrm{ max}}}$). Due volume...
Abstract Fluid injection into the Earth's crust can induce seismic events that cause damage to local infrastructure but also offer valuable insight seismogenesis. The factors influence magnitude, location, and number of induced remain poorly understood include flow rate pressure as well reservoir temperature permeability. relationship between parameters injection‐induced seismicity in high‐temperature, high‐permeability reservoirs has not been extensively studied. Here we focus on...
SUMMARY In the field of seismic interferometry, cross-correlations are used to extract Green’s function from ambient noise data. By applying a single station variation method, using autocorrelations, we in principle able retrieve zero-offset reflections stratified Earth. These valuable as they do not require an active source and, being zero-offset, better constrained space than passive earthquake based measurements. However, studies that target Moho signals with autocorrelations often give...
Abstract. Since the 1980s a number of active and passive seismic experiments have revealed significant information about Earth’s crust in broader European Alpine region. In this paper, we use waveform data from AlpArray Seismic Network three other temporary networks, to perform receiver function (RF) calculations time−to−depth migration update knowledge Moho discontinuity beneath Alps. particular, set up 5 homogeneous processing scheme compute RFs using time-domain iterative deconvolution...
<p>In the Eastern Alps, teleseismic tomography suggests that there is a switch from European subduction in west to Adriatic east. The dense SWATH-D seismic network located central-eastern Alps between around 10°E and 14.5°E where change dip direction was suggested occur (e.g. Lippitsch et al. 2003; Mitterbauer 2011). receiver function method particularly sensitive velocity contrasts so suited imaging interfaces associated with subduction. New...
<p>The dense SWATH-D seismic network in the Central-Eastern Alps gives an unprecedented window into collision of Adriatic and European plates. Previous studies have suggested a Moho gap overlying subduction polarity switch. This switch, from west to east, was by teleseismic tomography where low velocity zones mantle were interpreted as two slabs with opposite polarity. The TRANSALP profile at 12°E indeed showed gently southward dipping truncated nearly flat...
Geophysical inverse problems (seismic tomography) are often significantly underdetermined meaning that a large range of parameter values can explain the observed data well within uncertainties. Markov chain Monte Carlo (McMC) algorithms based on Voronoi cell parameterizations have been used for quantifying uncertainty in seismic tomography number years. Since surface waves constrain absolute shear velocities and receiver functions (RFs) image discontinuities beneath locations, joint...
<p>The European Alps, formed by the interactions between and Adriatic plates, is a unique geological structure that has been extensively studied over past decades. Despite numerous active passive seismic investigations in past, crustal across whole Alpine domain somehow limited - mainly due to number of seismometers available. The deployment AlpArray Seismic Network provides, which consisted around 600 broadband was operational from early 2016 till mid-2019, offers opportunity...