A5035526632- Geophysics and Sensor Technology
- Advanced Fiber Optic Sensors
- Seismic Waves and Analysis
- Advanced Fiber Laser Technologies
- Inertial Sensor and Navigation
- Astronomical Observations and Instrumentation
- Seismic Imaging and Inversion Techniques
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Railway Engineering and Dynamics
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Geophysics and Gravity Measurements
Ludwig-Maximilians-Universität München
2020-2025
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2022
Karlsruhe Institute of Technology
2021
SUMMARY Single-component ring lasers have provided high-resolution observations of Earth’s rotation rate as well local earthquake- or otherwise-induced rotational ground motions. Here, we present the design, construction and operational aspects ROMY, a four-component, tetrahedral-shaped laser installed at Geophysical Observatory Fürstenfeldbruck near Munich, Germany. Four equilateral, triangular-shaped with 12 m side length provide motions that can be combined to construct complete vector...
Abstract Unconsolidated sediments can amplify ground motions, increasing seismic hazard. Horizontal-to-vertical spectral ratios derive the thickness of overlaying stiffer bedrock. However, additional information about shear velocities and calibration with other structural is necessary. Here, we propose a strictly ambient noise-based workflow that map depth without from data sources. Rayleigh wave dispersion curves ellipticities are derived three-component beamforming noise combined...
During expedition PS115/1, the German research vessel Polarstern acquired seismic refraction data along a 102-km-long profile crossing Greenland's northern continental margin and extending up to southwestern limit of Morris Jesup Spur. A P–wave velocity model is obtained validated by gravity modelling. nearby reflection line provides insights on structures within sedimentary cover. Beneath 2-km-thick cover with velocities 1.8 km/s 3.4 km/s, an 1.5-km-thick layer characterized 4.2 interpreted...
Abstract The development of high-sensitive ground-motion instrumentation for Earth and planetary exploration is governed by so-called low-noise models, which characterize the minimum level physical ground motions, observed across a very broad frequency range (0.1 mHz–100 Hz). For decades, broadband instruments seismic translational sensing allowed observations down to Earth’s model. Knowing lowermost noise distribution frequencies enabled not only infer characteristics such as ocean...
RV MARIA S MERIAN cruise MSM 71 sailed in the Ligurian Sea from Feb 07 to 27, 2018 de-install a network of broadband ocean bottom seismometers (OBS) deployed June 2017 and acquire two refraction seismic profiles using short period OBS. The long-term comprising 30 forms an integral part European AlpArray initiative German DFG Priority Programme SPP ‚Mountain Building 4 Dimensions‘ MB 4D (http://www.spp-mountainbuilding.de/). consists stations provided by DEPAS-Pool as well institutes IPGP,...
Single-component ring lasers have provided high-resolution observations of Earth's rotation rate as well local earthquake- or otherwise-induced rotational ground motions. Here we present the design, construction, and operational aspects ROMY, a four-component, tetrahedral-shaped laser installed at Geophysical Observatory Fürstenfeldbruck near Munich, Germany. Four equilateral, triangular-shaped with 12 m side length provide motions that can be combined to construct complete vector from point...
A high-sensitive, large-scale ring laser gyroscope provides access to direct observations of local rotational ground motions. tetrahedral configuration gyroscopes, such as ROMY (ROtational Motions in seismologY), located a Geophysical Observatory near Munich, Germany, enables redundantly observe all three components the rotation vector.For seismic accelerations below 30 mHz, separation low noise background levels between vertical and horizontal component are well established understood...
Ubiquitous acoustic gravity waves in the atmosphere lead to elastic deformations of Earth’s surface via ambient barometric pressure variations at ground level. The induced are composed vertical and horizontal displacements as well tilts or equivalently rotations around axes. To make inferences about background levels rotational motions we exploit fact that sensed by both suitably oriented gyroscopes, component accelerometers through tilt coupled gravity.  Based on...
Fibre-optic gyros (FOG) allow measuring rotational ground motions and have recently been the method of choice for a first-generation broadband sensor seismology. FOGs unity transfer function, are insensitive to translations – combined with seismometers exploiting power six-degree-of-freedom processing (6 DoF) methods. This includes phase separation, backazimuth velocity estimation as well tilt-correction. Recently, permanent 6 DoF system has installed at Pinon Flat Observatory,...
A high-sensitive, large-scale optical Sagnac gyroscope provides access to direct observations of the rotational part gradient seismic wavefield. tetrahedral configuration Sagnac gyroscopes, such as ROMY (ROtational Motions in seismologY), located a Geophysical Observatory near Munich, Germany, enables redundantly observe all three components curl displacement field.For accelerations below 30 mHz, separation low noise...
In seismology, an increased effort to observe all 12 degrees of freedom seismic ground motion by complementing translational observations with measurements strain and rotational motions could be witnessed in recent decades, aiming at enhanced probing understanding Earth other planetary bodies. The evolution optical instrumentation, particular large-scale ring laser installations, such as G-ring ROMY (ROtational Motion seismologY), their geoscientific application have contributed...
<p>The quantitative low/high noise models (L/HNM) for translational ground motions (e.g., Petersen 1993) based on many observations of acceleration power-spectral densities has been extremely successful the evaluation site quality, as well development seismic sensors passive experiments Earth. No such L/HNM exists rotational motions, primarily because 1) there are close to no direct that measure below Earth’s smallest (large ring laser currently most sensitive...
In September 2022, a three-component rotational rate sensor (blueSeis-3A) provided by IRIS has been deployed at the underground vault of Piñon Flat Observatory (PFO) near San Diego in California. A broadband seismometer (Trillium 240s) is co-located on granite pier, creating 6C station for permanent observations local and regional seismicity wavefield studies. The record streamed online via freely available with all required metadata (station: BlueSeis Pinon = BSPF). Additionally,...
<p>Ring lasers are now resolving the rate of rotation Earth with 8 significant digits. Technically they constitute a Sagnac interferometer, where traveling wave resonator, circumscribing an arbitrary contour, defines optical frequency two counter-propagating resonant laser beams. Subtle non-reciprocal effects on beam however, cause variable bias, which reduces long-term stability. Over last years, we have improved performance G ring to point that obtain stable conditions over...
<p>The Ecuadorian subduction regularly hosts large earthquakes. Among them, the Mw 8.8 1906 earthquake is 7th biggest known event. Following recent 2016 7.8 Pedernales earthquake, a deployment of onshore/offshore seismological stations, in addition to permanent seismological/geodetical network, revealed complex slip behavior including presence  of  seismic and aseismic slip.</p><p>During geophysical experiment HIPER, march...