A5086354632- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Antifungal resistance and susceptibility
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Landslides and related hazards
- Reservoir Engineering and Simulation Methods
- Fungal Infections and Studies
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Geological and Geophysical Studies Worldwide
- Agriculture, Plant Science, Crop Management
- Cryospheric studies and observations
- Hydraulic Fracturing and Reservoir Analysis
- Geophysics and Sensor Technology
- Geomagnetism and Paleomagnetism Studies
- Geological Modeling and Analysis
- Microscopic Colitis
- Geology and Paleoclimatology Research
- Drilling and Well Engineering
- Clostridium difficile and Clostridium perfringens research
University of Potsdam
2015-2025
University of Copenhagen
2024
GFZ Helmholtz Centre for Geosciences
2013-2022
University Hospital Cologne
2012-2019
University of Cologne
2019
Universität Hamburg
2008-2012
Federal Institute for Geosciences and Natural Resources
2010
Abstract Flank instability and sector collapses, which pose major threats, are common on volcanic islands. On 22 Dec 2018, a collapse event occurred at Anak Krakatau volcano in the Sunda Strait, triggering deadly tsunami. Here we use multiparametric ground-based space-borne data to show that prior its collapse, exhibited an elevated state of activity, including precursory thermal anomalies, increase island’s surface area, gradual seaward motion southwestern flank dipping décollement. Two...
Large volcanic eruptions on Earth commonly occur with a collapse of the roof crustal magma reservoir, forming caldera. Only few such collapses per century, and lack detailed observations has obscured insight into mechanical interplay between eruption. We use multiparameter geophysical geochemical data to show that 110-square-kilometer 65-meter-deep Bárdarbunga caldera in 2014-2015 was initiated through withdrawal magma, lateral migration 48-kilometers-long dike, from 12-kilometers deep...
A spatially localized seismic sequence originated few tens of kilometres offshore the Mediterranean coast Spain, close to Ebro river delta, starting on 2013 September 5, and lasting at least until October. The culminated in a maximal moment magnitude Mw 4.3 earthquake, October 1. most relevant seismogenic feature area is Fosa de Amposta fault system, which includes different strands mapped distances coast, with general NE–SW orientation, roughly parallel coastline. However, no significant...
Abstract. The finite physical source problem is usually studied with the concept of volume and time integrals over Green's functions (GFs), representing delta-impulse solutions to governing partial differential field equations. In seismology, use realistic Earth models requires calculation numerical or synthetic GFs, as analytical are rarely available. computation such GFs computationally operationally demanding. As a consequence, on-the-fly recalculation in each iteration an optimisation...
The development of fast, automatic routines for the retrieval point source parameters medium to large earthquakes was convincingly established in last years and decades, providing an increasing number focal mechanism solutions. Original applications at teleseismic distances have been successively accompanied by specific regional data sets. majority these methods are based on fit low‐passed time traces. We present here a new technique highly parameterized kinematic rupture models distances,...
Objectives: Invasive mold infections associated with Aspergillus species are a significant cause of mortality in immunocompromised patients. The most frequently occurring aetiological pathogens members the section Fumigati followed by Terrei. frequency terreus and related (cryptic) clinical specimens, as well percentage azole-resistant strains remains to be studied. Methods: A global set (n = 498) A. phenotypically isolates was molecularly identified (beta-tubulin), tested for antifungal...
Abstract The Bayesian earthquake analysis tool (BEAT) is an open-source Python software to conduct source-parameter estimation studies for crustal deformation events, such as earthquakes and magma intrusions, by employing a framework with flexible problem definition. features functionality calculate Green’s functions homogeneous or layered elastic half-space. Furthermore, algorithm(s) that explore the solution space may be selected from suite of implemented samplers. If desired, BEAT’s...
The occurrence of deep low-frequency (DLF) microearthquakes beneath volcanoes is commonly attributed to mass transport in the volcanic plumbing system and used infer feeding channels from into magma reservoirs. key question how magmas migrate depth shallow crust whether reservoirs are currently being recharged. For first time since improvement local seismic networks East Eifel region (Rhineland-Palatinate, Germany), we detect locate recurrent DLF earthquakes lower upper mantle Laacher See...
ABSTRACT Since 1991, induced earthquakes have been observed and linked to gas production in the Groningen field. Recorded waveforms are complex, resulting partly from a Zechstein salt layer overlying reservoir free-surface reverberations, internal multiples, interface conversions, guided waves, waves diving below reservoir. Therefore, picking of polarities or amplitudes for use moment tensor inversion is problematic, whereas phase identification may be circumvented employing full waveform...
ABSTRACT Recent developments in the densification of seismic network covering Groningen gas field allow a more detailed study connection between induced seismicity and reactivated faults around reservoir at 3 km depth. With reduction average station distance from 20 to 4–5 km, probabilistic full-waveform moment tensor inversion procedure could be applied, resulting both improved hypocenter location accuracy full solutions for events M≥2.0 recorded period 2016–2019. Hypocenter locations as...
The 2014 April 1, Mw 8.1 Iquique (Chile) earthquake struck in the Northern Chile seismic gap. With a rupture length of less than 200 km, it left unbroken large segments former Early studies were able to model main features but results are ambiguous with respect role aseismic slip and open questions on remaining hazard at A striking observation has been its extensive preparation phase, more 1300 events magnitude above ML 3, occurring during 15 months preceding shock. Increasing seismicity...
A hybrid method is proposed to calculate complete synthetic seismograms based on a spherically symmetric and self-gravitating Earth with multilayered structure of atmosphere, ocean, mantle, liquid core solid core. For large wavelengths, numerical scheme used solve the geodynamic boundary-value problem without any approximation deformation gravity coupling. With decreasing wavelength, effect becomes negligible analytical propagator can be used. Many useful approaches are overcome problems...
Abstract. The Alpine mountains in central Europe are characterized by a heterogeneous crust accumulating different tectonic units and blocks close proximity to sedimentary foreland basins. Centroid moment tensor inversion provides insight into the faulting mechanisms of earthquakes related processes but is significantly aggravated such an environment. Thanks dense AlpArray seismic network our flexible bootstrap-based tool Grond, we able test setups with respect uncertainties obtained tensors...
Abstract An earthquake swarm affected the Bransfield Strait, Antarctica, a unique rift basin in transition from intra-arc rifting to ocean spreading. The swarm, counting ~85,000 volcano-tectonic earthquakes since August 2020, is located close Orca submarine volcano, previously considered inactive. Simultaneously, geodetic data reported up ~11 cm northwestward displacement over King George Island. We use broad variety of geophysical and methods reveal complex migration seismicity,...
We introduce a data-driven method and software for detecting locating earthquakes in large seismic datasets. By combining phase arrival annotations, delivered by neural network pickers, waveform stacking with an adaptive octree search, we can automatically detect locate events even noise-dominant data. The resolution of the search volume is iteratively refined toward source location; this strategy facilitates efficient, fast, accurate search. present user-friendly high-performance...
Large earthquakes can trigger other at great distances, even on a global scale, through the dynamic stresses imparted by their seismic waves. However, identifying such remote triggering is not always straightforward. It may occur only instantaneously, during passage of waves, but also with delayed effect—sometimes days or weeks after initial event. Recognizing this phenomenon in historical earthquake catalogues, which are incomplete, particularly challenging, yet it essential for...